Metrosensor: electrodes from Metrohm

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Metrosensor: electrodes from Metrohm

  1. 1. Metrosensor electrodesPrecision is not accidental, but brought about bydesign!
  2. 2. 2
  3. 3. Table of contentsWhich electrode for which application?Electrode recommendations for pH measurement 6-7 6 How is a Metrosensor made? 78-79 3Electrode recommendations for titration 7 Theoretical fundamentals 80-101 1. Fundamentals of potentiometry 80-Electrode catalog 8-69 1.1. Measuring setup 80iTrodes 8-9 1.2. From potential to ion concentration –Separate pH electrodes 12-13 the Nernst equation 80-81Electrodes for pH measurement 14-17 1.3. Measuring electrodes 82Electrodes for pH titration 18-21 1.3.1. pH glass electrodes 82-86Special electrodes for pH measurement/pH titration 22-25 1.3.2. Metal electrodes 86-88Separate metal and carbon electrodes 28-29 1.3.3. Ion-selective electrodes 88-90Titrodes 30-31 1.4. Reference electrodes 90Combined metal electrodes 32-33 1.4.1. Silver/silver chloride reference system 90Electrodes for voltammetry 34-37 1.4.2. Metrosensor «Long Life» reference system 91Electrodes for Karl Fischer titration 38-41 1.4.3. Diaphragms 91-94Ion-selective electrodes and accessories 44-47 1.4.4. Reference electrolytes andSurfactant electrodes and accessories 48-51 bridge electrolytes 95Reference electrodes 54-57 2. Fundamentals of conductometry 96-100Conductometric measuring cells 60-65 2.1. General 96-99Temperature sensors 66-67 2.2. Conductivity measurement in accordanceSensors for photometry 68-69 with USP and Pharm. Europe (EP) 99-100 3. Temperature measurement 101Accessories 71-77Electrode components and other accessories 72-73 Appendix 102-106Ion standards, buffer solutions, electrolytes 74-75 Technical specifications 102-106Electrical connections 76-77
  4. 4. 4 Metrohm stands for 65 year’s experience in ion analysis – why should you wrack your brains, when weve already done the thinking for you? Metrohm Application Bulletins – instructions that are guaranteed to work. Pharm PAC – the most important methods for the Metrohm PACs (Potentiometric Analysis Collections) determination of pharmaceutical ingredients in contain ready-to-use methods, which are right up to accordance with European and US pharmacopeias. date and always in compliance with the respective stand- ards and regulations. Wine PAC – the most important methods in wine analysis. Surf PAC – the most important methods in sur- factant analysis. Plate PAC – the most important methods for the analysis of galvanic baths. Oil PAC – the most important methods for the analysis of petroleum products. Food PAC – the most important methods in food analysis. Get your know-how from the market leader! www.metrohm.com
  5. 5. Electrode catalogThe illustrations of the articles are, unless specified other-wise, approximately in original size. Materials abbreviations: EP Epoxide 5 PCTFE PolychlortrifluoroethyleneUnless otherwise specified, all combined pH electrodes PE Polyethyleneare filled with the referenced electrolytes c(KCl) = 3 mol/L PEEK Polyetheretherketone(Order number 6.2308.020). PMMA Polymethyl metacrylate POM PolyoxymethyleneThe abbreviation «LL reference system» stands for the PP PolypropyleneMetrosensor «Long Life» reference system. More detailed PTFE Polytetrafluoroethyleneinformation on this can be found in the theoretical PVC Polyvinyl chloridesection, Chapter 1.4.2.«DJ» stands for «double junction». These electrodes areequipped with a bridge electrolyte chamber; the bridgeelectrolyte is replaceable, which means that it can beadapted to suit the sample.Detailed information concerning technical specificationscan be found in the appendix «Technical Specifications.»The electrochemical parameters are specified for 25 °C,the outflow rates with a hydrostatic pressure of a 10 cmhigh water column. «Shaft length» refers to the length ofthe electrode tip up to the lower edge of the electrodeplug-in head. The installation length is the length fromthe electrode tip to the upper edge of the standardground joint. In the case of flexible SGJ sleeves, this cor-responds to the length down to the electrolyte refillopening below. All flexible SGJ sleeves have like their sizethe standard ground joint 14/15.
  6. 6. Electrodes for pH measurement6 Application Universal Details Clear, aqueous solutions, pH 0...14 Electrode Primatrode with NTC Order number 6.0228.010 Page 14 Universal laboratory use, pH 0...14 Unitrode with Pt 1000 6.0258.600 16 Routine measurement in similar samples Ecotrode Gel with NTC 6.0221.600 14 pH 1...11 Water General (demineralized water, drinking Aquatrode Plus with Pt 1000 6.0257.000 16 water, process water, sea water, environ- mental sector) Waste water General Unitrode with Pt 1000 6.0258.600 16 Sewage containing sulfides Profitrode 6.0255.100 18 Soil samples General (aqueous suspensions) Flat-membrane pH electrode 6.0256.100 22 Agriculture Fertilizers Unitrode with Pt 1000 6.0258.600 16 Horticulture solutions containing proteins Porotrode 6.0235.200 22 Plant cultivation Liquid manure Profitrode 6.0255.100 18 Small sample volumes, culture media Biotrode 6.0224.100 22 Nutrient solutions Viscotrode 6.0239.100 24 Food General Unitrode with Pt 1000 6.0258.600 16 Beverages Food containing proteins, beer Porotrode 6.0235.200 22 Semi-luxury arti- Bread, meat, cheese, dough (measurements Spearhead electrode 6.0226.100 22 cles semi-solid samples) Fruit and vegetable juices, wine, spirits Unitrode with Pt 1000 6.0258.600 16 Drinking water Aquatrode Plus with Pt 1000 6.0257.000 16 Pharmaceuticals Creams, liquid formulations, medicinal syrup, Viscotrode 6.0239.100 24 Biological mouthwash solutions, raw materials monitor- samples ing in accordance with pharmacopoeias Dialysis solutions, urine Unitrode with Pt 1000 6.0258.600 16 Solutions containing proteins Porotrode 6.0235.200 22 Infusion solutions Aquatrode Plus with Pt 1000 6.0257.000 16 Small sample volumes, gastric juice, serum Biotrode 6.0224.100 22 Pilot plant measurements Syntrode with Pt 1000 6.0248.0X0 24 Cosmetics General (emulsions, shampoos, shower Viscotrode 6.0239.100 24 baths, liquid soaps, lotions, mouthwashes, perfumes) Skin (surfaces) Flat-membrane pH electrode 6.0256.100 22 Make-up Microelectrode 6.0234.100 24 Cleaning agents General (detergents, dishwashing liquids, Viscotrode 6.0239.100 24 Detergents cleaning agents, surfactant solutions) Samples with pH values 10 Profitrode 6.0255.100 18 High-viscosity samples Unitrode with Pt 1000 6.0258.600 16 Leather Bleaching and dyeing baths, tanning liquors Profitrode 6.0255.100 18 Paper Fountain solution for offset printing, glue Unitrode with Pt 1000 6.0258.600 16 Textiles Leather, paper, textiles (surface) Flat-membrane pH electrode 6.0256.100 22 Washing liquors Viscotrode 6.0239.100 24 Paints Stains (wood), dye baths, inks Profitrode 6.0255.100 18 Lacquers Dispersions, emulsions, resins, lacquers, Unitrode with Pt 1000 6.0258.600 16 Solvents suspensions Paint coatings (surfaces) Flat-membrane pH electrode 6.0256.100 22 Non-aqueous, polar solvents EtOH-Trode 6.0269.100 16 Electroplating General (etching, pickling and degreasing baths, Profitrode 6.0255.100 18 Metal process- alkaline electroplating and phosphatizing ing Acidic electroplating baths Unitrode with Pt 1000 6.0258.600 16 Drilling oil emulsions Viscotrode 6.0239.100 24 Special Measurements in semi-solid samples Spearhead electrode 6.0226.100 22 applications Solutions containing proteins Porotrode 6.0235.200 22 Samples with pH values 12 and tempera- Unitrode with Pt 1000 6.0258.600 16 tures 50...80 °C Temperature 80...100 °C Unitrode with Pt 1000 reference 6.0258.600 16 electrolyte: Idrolyte Ion-deficient, weakly buffered solutions Aquatrode Plus with Pt 1000 6.0257.000 16 Small sample volumes Biotrode 6.0224.100 22 Flat-membrane pH electrode 6.0256.100 22 Surface measurements Flat-membrane pH electrode 6.0256.100 22 Developer baths, concentrated acids Profitrode 6.0255.100 18 Emulsions/suspensions Unitrode with Pt 1000 6.0258.600 16 Fuels containing ethanol/E85 EtOH-Trode 6.0269.100 16
  7. 7. Electrodes for titrationApplicationAqueous Details General Electrode Ecotrode Plus Order number 6.0262.100 Page 18 7acid/base Routine measurement in similar samples Ecotrode Gel 6.0221.100 18titrations Alkaline samples, Bayer liquors Unitrode 6.0259.100 18 Titrations at high temperatures Unitrode with reference electro- 6.0259.100 18 lyte Idrolyte Acid content of alcoholic beverages Unitrode with Pt 1000 6.0258.600 18 Titrations with small sample volumes Microelectrode 6.0234.100 24 Flat-membrane electrode 6.0256.100 22 Titrations in ion-deficient aqueous media Aquatrode Plus 6.0253.100 20 Carbonate hardness and acid capacity of Aquatrode Plus with Pt 1000 6.0257.000 16 water, p m values Electroplating, etching and phosphatizing Profitrode 6.0255.100 18 Etching baths containing fluoride or Combined antimony electrode 6.0421.100 32 hydrofluoric acid Samples containing protein Porotrode 6.0235.200 22Non-aqueous Titrations with perchloric acid, cyclohexylamine, Solvotrode with c(LiCl) = 2 mol/L 6.0229.100 20acid/base alcoholic HCl, determination of base number in ethanoltitrations (TBN) of crude oil products Titrations with alcoholic KOH, NaOH and Solvotrode with c(TEABr) = 0.4 6.0229.100 20 TBAOH, potassium methylate, determination mol/L in ethylene glycol of the total acid number (TAN) of petroleum products, free fatty acid/hydroxyl number in oils and fatsRedox titrations Titrations without change of the pH value Pt Titrode 6.0431.100 30Titrants: Titrations with change of the pH value Combined LL-Pt ring electrode 6.0451.100 32arsenite, cersulfate Chemical oxygen demand (COD) in waters Combined LL-Au ring electrode 6.0452.100 32iron(III), iodine,potassium bromate Penicillin, ampicillin Combined LL-Au ring electrode 6.0452.100 32sodium nitrite Bromatometry, iodometry and cerimetry in Pt Titrode 6.0431.100 30oxalic acid, perman- accordance with Pharm. Europe USPganate, thiosul-fate, titanium(III),Hg(NO3)2Karl Fischer rea- Water determination according to Karl Double Pt wire electrode 6.0338.100 38gent FischerTitrations in Double Pt wire electrode 6.0341.100 38«Ipol» modePrecipitation Chloride in general, sodium chloride content Ag Titrode 6.0430.100 30titrations in foodsTitrants: Chloride in dialysis and infusion solutions Ag Titrode with Ag2S coating 6.0430.100 30Silver nitrate Titrations in accordance with Pharm. Europe USP Ag Titrode with Ag2S coating 6.0430.100 30 Determination of hydrogen sulfide, mer- Ag Titrode with Ag2S coating 6.0430.100 30 captans, carbonyl sulfides, sulfides Chloride, bromide, iodide and cyanide in Ag Titrode with Ag2S coating 6.0430.100 30 electroplating baths – Fluoride/hydrofluoric acid in etching baths F -ISE – crystal membrane 6.0502.150 44Complexometry Back titration of excess Ba2+ with EDTA 2+ Ca -ISE polymer membrane 6.0508.110 44Titrants: 2+ 2+ Determination of Ca , Mg in aqueous Ca2+-ISE polymer membrane 6.0508.110 44EDTA, solutions (in accordance with AB 125) ©Complexon 2+ Determination of Al, Ba, Bi, Ca, Cd, Co, Fe, Cu -ISE crystal membrane 6.0502.140 44III and IV Mg, Ni, Pb, ZnPhotometric Color indicators such as xylene orange, N,N- Spectrosense 523 nm 6.5501.100 Titrino 68titrations diethyl-1,4-phenylenediamine, phenol- 6.5501.200 phthalein, thorine, dichlorophenolindophenol Titrando, Titrino plus Color indicators such as dimethylsulfonazo III, Spectrosense 610 nm 6.5501.110 Titrino 68 hydroxy naphthol blue, eriochrome black T, 6.5501.210 HHSNN, diphenylaminosulfonate, murexide Titrando, Titrino plusSurfactants in Titration of anionic and cationic surfactants, Surfactrode Resistant 6.0507.130 48non-aqueous titrations in chloroform, formulations con-media taining oil such as cooling lubricants, drillingAromatic and and cutting oils, oil-containing shower baths,aliphatic hydro- pH 10carbons, ketones, Titration of anionic and cationic Surfactrode Refill 6.0507.140 48gasoline, kerosene, surfactants, titration of surfactant formula-dichloroethane and tions, washing powders, soaps, pH 10trichloroethaneSurfactants in Titration of cationic surfactants «Cationic Surfactant» electrode 6.0507.150 48aqueous media Titration of anionic surfactants «Ionic Surfactant» electrode 6.0507.120 48 Titration of non-ionic surfactants NIO electrode 6.0507.010 48 Titration of pharmaceutical ingredients with sodium tetraphenylborate
  8. 8. iTrodes – The intelligent electrodes8 The iTrodes The iTrodes of the new intelligent electrode generation 854 iConnect – measuring input «on a chip» The green color of Metrohm has always meant leading confirm Metrohm’s longstanding leadership position in edge technology. Thanks to state-of-the-art electronics the field of potentiometric titration. Metrohm reduces an entire measuring input down to the size of a postage stamp. This means that the complete The electrode used for the titration is the most important measuring input fits in the electrode cable head. It is component of any titration system. But until now, the automatically recognized and identified by its serial electrode, of all things, has represented the last gap in number. traceability. The Titrando with iConnect closes this gap, thus guaranteeing complete traceability of the analytic Digital data transmission result to each component playing a role in the analysis. Directly in the sensor, the analog/dialog converter of the latest generation in the 854 iConnect, converts the ana- Digital identification – Mix-ups are eliminated log measuring signal into binary code. Digital data trans- The built-in memory chip enables the storage of impor- mission means that the measuring signal is no longer tant sensor data such as article number, serial number, susceptible to electrostatic influences. Interference-free calibration data, calibration history, working life and transmission can now always be guaranteed, no matter calibration validity period. how long the electrode cable is. All of the sensor data are uploaded automatically when Just take the measuring input with you! the iTrode is connected to the Titrando. This means that With 854 iConnect the sensor and measuring input are the possibility of any mix-up or editing error is elimi- always calibrated together and the calibration data is nated. stored in the intelligent electrode. As the measuring input is no longer built into the instrument, the electrode The electrode is identified automatically. The user is and 854 iConnect can be used together with different informed if the electrode does not match the one titrators. The calibration procedure is no longer associ- defined in the method. This means that it is not possible ated with a particular titrator. to use an incorrect electrode. iTrodes can be used with the 867 pH module or the 888 Storage of calibration data – no chance for outliers and 90x Titrandos. Monitoring functions allow the exclusion of electrodes whose calibration data lies outside the limits or whose calibration period has already expired. If the sensor is used on different instruments or if one wishes to prevent inexperienced users from having to calibrate the electrode on their own instruments, the electrode can be calibrated on a different instrument under defined conditions. The calibration data in the memory chip make the electrode transferable; it thus does not need to be recalibrated every time it is used with a different instrument.
  9. 9. 9Ordering informationiAquatrode Plus with Pt 1000 6.0277.300iUnitrode with Pt 1000 6.0278.300iSolvotrode 6.0279.300iEcotrode plus 6.0280.300iAg Titrode 6.0470.300iAg Titrode with Ag2S coating 6.0470.300SiPt Titrode 6.0471.300iConnect 2.854.0010
  10. 10. 10
  11. 11. Electrodes for pH measurement/pH titration 11Fine-tune your measurements!The greatest precision and ease of care – these are the two outstanding properties of Unitrode and Aquatrode Plus.The constant electrolyte outflow of the fixed ground joint diaphragm (which is largely insensitive to contamination)guarantees a low-noise measuring signal, even in difficult samples and independent of the measuring conditions.Further details can be found in the theoretical section on page 92.
  12. 12. Separate pH glass electrodes12 Separate pH glass electrode Electrically shielded Technical specifications pH range 0...14 Blue T glass for reliable results, e.g. in differential Temperature range 0...80 °C potentiometry in non-aqueous media Installation length 142 mm Optimal length for sample changer applications Shaft diameter 12 mm Minimum immersion depth 15 mm Electrode plug-in head Metrohm plug-in head G Differential potentiometry In addition to the measuring electrode, a reference electrode and an auxiliary electrode are required for differential potentiometry. The shielding of the reference electrode must be identical to that of the measuring electrode. Reference electrodes for differential potentiometry (see «Reference electrodes» section) Ag/AgCl DJ reference electrode, length 125 mm, Metrohm plug-in head G Without electrolyte filling, without cable 6.0729.100 Filled with LiClsat in ethanol, without cable 6.0729.108 Ag/AgCl DJ reference electrode, length 162 mm, Metrohm plug-in head G Without electrolyte filling, without cable 6.0729.110 Auxiliary electrodes for differential potentiometry, Metrohm plug-in head B (see «Separate metal electrodes» section) Separate Pt wire electrode 6.0301.100 Separate Pt pin electrode 6.1241.040 + 6.1248.000 Separate Pt ring electrode 6.0351.100
  13. 13. 13Ordering informationSeparated pH glass electrode, without cable 6.0150.100
  14. 14. Electrodes for pH measurement14 Primatrode with NTC – the economical entry to GLP-compliant pH measurement Technical specifications Primatrode For solutions that do not contain precipitates, pro- Shaft material PP teins or sulfides pH range 0...14 Long-lasting standard electrode Temperature range 0...80 °C Unbreakable plastic shaft Temperature sensor NTC Impact protection for the glass membrane Diaphragm Ceramic pin Fixed cable (length 1.2 m) Installation length 113 mm LL reference system with long-term stability Shaft diameter 12 mm Variant 6.0228.020 with waterproof plug I for use Minimum immersion depth 15 mm with the 826 pH mobile (IP67) The Solitrode with Pt 1000 – robust and reliable, Technical specifications ideal for routine laboratory use Solitrode For solutions that do not contain precipitates, proteins Shaft material PP or sulfides pH range 0...14 Long-lasting standard electrode Temperature range 0...80 °C Unbrekable plastic shaft Temperature sensor Pt 1000 Impact protection for the glass membrane Diaphragm Ceramic pin Fixed cable (length 1.2 m) Installation length 113 mm LL reference system with long-term stability Shaft diameter 12 mm Minimum immersion depth 15 mm Ecotrode Gel – the maintenance-free solution Technical specifications Ideal for routine measurements in similar samples Ecotrode Gel Maintenance-free Shaft material Glass Life-time indicator pH range 1...11 LL reference system with long-term stability Temperature range 0...60 °C Temperature sensor NTC Diaphragm Twin pore Installation length 125 mm Shaft diameter 12 mm Minimum immersion depth 20 mm Electrode plug-in head Metrohm plug-in head U How to store your electrodes correctly: Rapid response is not a matter of magic, but rather a question of storage! Metrohm recommends the patented 6.2323.000 storage solution for all combined pH glass electrodes which use c(KCl) = 3 mol/L as the reference electrolyte. This prevents the aging of the glass membrane and, as a result, guarantees response times short as they were on the first day. More information on this can be found in the theoretical section in Chapter 1.3.1. «pH glass electrodes.»
  15. 15. 15 Primatrode The economical entry to GLP-compliant pH measurement Solitrode Robust and reliable, ideal for routine laboratory use Ecotrode Gel The maintenance-free solutionOrdering informationPrimatrode with NTC, fixed cable with plug F + 1 x 2 mm 6.0228.010Primatrode with NTC, fixed cable with plug I (IP67) + 1 x 2 mm 6.0228.020Solitrode without temperature sensor, without cable 6.0220.100Solitrode with Pt 1000, fixed cable plug F + 2 x 4 mm 6.0228.000Ecotrode Gel with NTC, without cable, plug-in head U 6.0221.600
  16. 16. Electrodes for pH measurement16 Unitrode with Pt 1000 – high performance in difficult samples and at high pH values Technical specifications Unitrode For universal use, even in dyes, pigments, inks, suspen- Shaft material Glass sions, resins and polymers pH range 0...14 Fixed ground-joint diaphragm insensitive to contamination Temperature range 0...100 °C High temperature resistance and very low alkali error Temperature sensor Pt 1000 Rapid response to temperature changes Diaphragm Fixed ground joint Outer electrolyte Idrolyte for temperatures of Installation length 113 mm 80...100 °C Shaft diameter 12 mm Fixed cable (length 1.2 m) or with plug-in head U and Minimum immersion depth 25 mm removable cable LL reference system with long-term stability Aquatrode Plus with Pt 1000 – ideal for weekly Technical specifications buffered aqueous solutions Aquatrode Plus Special electrode membrane glass: precise measuring Shaft material Glass values and very rapid response times, even in weekly pH range 0...13 buffered solutions such as drinking water, surface Temperature range 0...60 °C water and rain water and other poorly conducting Temperature sensor Pt 1000 solutions Diaphragm Fixed ground joint Maintenance-free inner reference electrolyte (gel) Installation length 125/260 mm Variable bridge electrolyte for special applications Shaft diameter 12 mm Fixed ground joint diaphragm insensitive to contamination Minimum immersion depth 20 mm Optimized length for sample changer applications Fixed cable (length 2 m) LL reference system with long-term stability Technical specifications EtOH-Trode – the specialist for ethanol EtOH-Trode Developed for pHe measurement in ethanol Shaft material Glass Special membrane glass pH range 0...12 Very precise ground joint diaphragm Temperature range 0...80 °C Double-junction system for free choice of electrolytes Diaphragm Fixed ground joint (e.g. 3 M KCI in ASTM D 6423, 1 M LiCI in EN Installation length 145 mm 15490). Shaft diameter 12 mm LL reference system with long-term stability Minimum immersion depth 20 mm Electrode plug-in head Metrohm plug-in head G Wellness for the electrode Reliable measuring results over long periods of time can only be guaranteed if the glass membrane and the dia- phragm receive preventative and regular care. Cleaning by means of etching with toxic chemicals or a mechanical treatment of the diaphragm is not only complicated and expensive, it also accelerates the aging of the pH glass electrode as well. The 6.2325.000 care kit was developed for simple, gentle cleaning of pH glass electrodes with a liquid electrolyte. Regular application can considerably prolong its lifetime.
  17. 17. 17 EtOH-Trode The specialist for pHe measurement Unitrode High performance, even in difficult samples and at high temperatures Aquatrode Plus Rapid response times and greatest precision in poorly buffered solutions due to special electrode glass and fixed ground joint diaphragmOrdering informationUnitrode with Pt 1000, fixed cable plug F + 2 x B (4 mm) 6.0258.000Unitrode with Pt 1000, fixed cable plug F + 2 x 2 mm 6.0258.010Unitrode without temperature sensor, without cable 6.0259.100Unitrode with Pt 1000, without cable, plug-in head U 6.0258.600Aquatrode Plus without temperature sensor, length 125 mm, without cable 6.0253.100Aquatrode Plus without temperature sensor, length 260 mm, without cable 6.0253.120Aquatrode Plus with Pt 1000, length 125 mm, fixed cable plug F + 2 x B (4 mm) 6.0257.000Aquatrode Plus with Pt 1000, length 260 mm, fixed cable plug F + 2 x B (4 mm) 6.0257.020EtOH-Trode without temperature sensor, without cable 6.0269.100
  18. 18. Electrodes for pH titration18 Ecotrode Gel – the maintenance-free solution Ideal for routine measurements in similar samples Technical specifications Ecotrode Gel Maintenance-free Shaft material Glass Lifetime indicator pH range 1...11 LL reference system with long-term stability Temperature range 0...60 °C Diaphragm Twin pore Installation length 125 mm Shaft diameter 12 mm Minimum immersion depth 20 mm Electrode plug-in head Metrohm plug-in head G Ecotrode Plus – high durability in routine use at a Technical specifications fair price Ecotrode Plus For acid/base titrations in various kinds of solutions Shaft material Glass Fixed ground joint diaphragm insensitive to contamination pH range 0...13 Ideal for routine laboratory use Temperature range 0...80 °C LL reference system with long-term stability Diaphragm Fixed ground joint Installation length 113 mm Shaft diameter 12 mm Minimum immersion depth 20 mm Electrode plug-in head Metrohm plug-in head G Profitrode – professional working in the most Technical specifications difficult of matrices Profitrode For difficult matrices (galvanic baths, precipitates, Shaft material Glass samples containing sulfides, etc.) pH range 0...14 Flexible ground joint diaphragm, particularly easy to Temperature range 0...80 °C clean Diaphragm Flexible ground joint Double-junction construction Installation length 113/170/310 mm Available in various lengths Shaft diameter 12 mm (113/170/310 mm) Minimum immersion depth 30 mm LL reference system with long-term stability Electrode plug-in head Metrohm plug-in head G Unitrode – high performance in difficult samples Technical specifications and at high pH values Unitrode For universal use, even in dyes, pigments, inks, sus- Shaft material Glass pensions, resins and polymers pH range 0...14 Fixed ground joint diaphragm insensitive to contamination Temperature range 0...100 °C High temperature resistance and very low alkali error Diaphragm Fixed ground joint Rapid response to temperature changes Installation length 113 mm Outer electrolyte Idrolyte for temperatures of Shaft diameter 12 mm 80...100 °C Minimum immersion depth 25 mm LL reference system with long-term stability
  19. 19. 19 Ecotrode Gel Maintenance-free pH measurement/ titration Ecotrode Plus High durability in routine use at a fair price Profitrode Professional working in the most difficult matrices Unitrode High performance in difficult samples and at high pH valuesOrdering informationEcotrode Gel without temperature sensor, without cable 6.0221.100Ecotrode Plus, without cable 6.0262.100Profitrode, length 113 mm, without cable 6.0255.100Profitrode, length 170 mm, without cable 6.0255.110Profitrode, length 310 mm, without cable 6.0255.120Unitrode with Pt 1000, fixed cable plug F + 2 x B (4 mm) 6.0258.000Unitrode with Pt 1000, fixed cable plug F + 2 x 2 mm 6.0258.010Unitrode without temperature sensor, without cable 6.0259.100Unitrode with Pt 1000, without cable, plug-in head U 6.0258.600
  20. 20. Electrodes for pH titration20 Aquatrode Plus – ideal for aqueous, weekly buffered solutions Technical specifications Aquatrode Plus Precise measuring values and very rapid response Shaft material Glass times in ion-deficient or weekly buffered solutions – pH range 0...13 such as drinking water, surface water and rain water Temperature range 0...60 °C – thanks to special membrane glass and optimized, Diaphragm Fixed ground joint fixed ground joint diaphragm insensitive to contamination Installation length 125/260 mm Maintenance-free inner reference electrolyte (gel) Shaft diameter 12 mm Variable bridge electrolyte for special applications Minimum immersion depth 20 mm Optimized length for sample changer applications Electrode plug-in head Metrohm plug-in head G LL reference system with long-term stability Solvotrode – space-saving alternative for titration Technical specifications in non-aqueous media Solvotrode For non-aqueous titrations in the pharmaceutical sector Shaft material Glass For determination of TAN/TBN in compliance with pH range 0...14 ASTM D4739, D2896 and D664 and DIN ISO 3771 Temperature range 0...70 °C and DIN EN 12634 Diaphragm Flexible ground joint Reference electrolyte: LiCl(sat) in ethanol Installation length 113 mm Rapid response and stable measuring values in Shaft diameter 12 mm organic solvents Minimum immersion depth 20 mm Shielding against electrostatic effects Electrode plug-in head Metrohm plug-in head G Flexible ground joint diaphragm, particularly easy to clean LL reference system with long-term stability Drinking water analysis – Does it matter at which stirring rate titration is performed? When stirring in ion-deficient solutions, streaming potentials occur at pH electrodes with ceramic pin diaphragms which falsify measuring values. In the case of a SET titration, e.g. to a defined pH value, a considerable error can be produced if an incorrect value is measured at the start or at the endpoint of the titration. See page 93 to find out why you can forget about this problem when using the Aquatrode Plus.
  21. 21. 21 Solvotrode Space-saving alternative for titration in non-aqueous media Aquatrode Plus Fast response and excellent pre- cision in weekly buffered solu- tions thanks to special membrane glass and fixed ground joint diaphragmOrdering informationSolvotrode, without cable 6.0229.100Aquatrode Plus without temperature sensor, length 125 mm, without cable 6.0253.100Aquatrode Plus without temperature sensor, length 260 mm, without cable 6.0253.120Aquatrode Plus with Pt 1000, length 125 mm, fixed cable plug F + 2 x B (4 mm) 6.0257.000Aquatrode Plus with Pt 1000, length 260 mm, fixed cable plug F + 2 x B (4 mm) 6.0257.020
  22. 22. Special electrodes for pH measurement/pH titration22 Biotrode – pH measurement in small volumes Very low immersion depth and very small diameter of Technical specifications Biotrode the electrode tip (3 mm), exceptionally suited to small Shaft material Glass measuring vessels pH range 1...11 For protein-containing samples and solutions with Temperature range 0...60 °C organic components Diaphragm Platinum wire Very low electrolyte outflow (Idrolyte) Installation length 113 mm LL reference system with long-term stability Shaft diameter 12 mm Shaft diameter bottom 3 mm Minimum immersion depth 7 mm Electrode plug-in head Metrohm plug-in head G Spearhead electrode – pH measurement in Technical specifications semi-solid samples Spearhead electrode Robust electrode tip for measurements in semi-solid Shaft material Glass samples such as cheese, meat, fruits, etc. pH range 1...11 Maintenance-free reference electrolyte (gel) Temperature range 0...40 °C Easy-to-clean diaphragm Diaphragm Twin pore LL reference system with long-term stability Installation length 98 mm Shaft diameter 12 mm Shaft diameter bottom 6 mm Minimum immersion depth 10 mm Electrode plug-in head Metrohm plug-in head G Flat-membrane electrode – pH measurement on Technical specifications surfaces and in small sample volumes Flat-membrane electrode For pH measurement on surfaces such as paper, textiles, Shaft material Glass leather or soil samples (aqueous suspensions) pH range 0...14 Measurement/titration in small sample volumes Temperature range 0...80 °C Completely made of glass with extremely fine- Diaphragm Fixed ground joint grounded surface Installation length 125 mm LL reference system with long-term stability Shaft diameter 12 mm Minimum immersion depth 1 mm Electrode plug-in head Metrohm plug-in head G Porotrode – pH measurement in protein contain- Technical specifications ing samples Porotrode For pH measurement in very contaminated, protein- Shaft material Glass containing or viscous samples pH range 0...14 Low-maintenance capillary diaphragm Temperature range 0...80 °C Polymer electrolyte Porolyte for uniform electrolyte Diaphragm Ceramic capillaries outflow Installation length 125 mm LL reference system with long-term stability Shaft diameter 12 mm Minimum immersion depth 20 mm Electrode plug-in head Metrohm plug-in head G
  23. 23. 23 Biotrode pH measurement in small volumes Spearhead electrode pH measurement in semi-solid samples Flat-membrane electrode pH measurement on surfaces Porotrode pH measurement in protein-containing samplesOrdering informationBiotrode, without cable 6.0224.100Spearhead pH glass electrode, without cable 6.0226.100Flat-membrane pH glass electrode, without cable 6.0256.100Porotrode, without cable 6.0235.200
  24. 24. Special electrodes for pH measurement/pH titration24 Microelectrode – routine use with sample changers and smal vials Technical specifications Microelectrode For simple acid/base titrations in aqueous solutions Shaft material Glass Available in various lengths (113/168 mm) pH range 0...14 LL reference system with long-term stability Temperature range 0...80 °C Diaphragm Ceramic pin Installation length 113/168 mm Shaft diameter 12 mm Shaft diameter bottom 6.4 mm Minimum immersion depth 20 mm Electrode plug-in head Metrohm plug-in head G Viscotrode – universal application in viscous Technical specifications media Viscotrode For viscous protein- or sulfides- containing media Shaft material Glass Flexible ground joint diaphragm, particularly easy to pH range 0...14 clean Temperature range 0...80 °C LL reference system with long-term stability Diaphragm Flexible ground joint Installation length 113 mm Shaft diameter 12 mm Minimum immersion depth 30 mm Electrode plug-in head Metrohm plug-in head G Syntrode with Pt 1000 – use in Technical specifications synthesis and in bioreactors Syntrode Low-maintenance thanks to storage vessel for Shaft material Glass reference electrolytes pH range 0...14 Fixed ground joint diaphragm insensitive to Temperature range 0...100 °C contamination Temperature sensor Pt 1000 High temperature resistance Diaphragm Fixed ground-joint Available in various lengths (288/438 mm) Installation length 288/438 mm Fixed cable (length 2/3 m) Shaft diameter 12 mm LL reference system with long-term stability Minimum immersion depth 25 mm
  25. 25. 25 size d in uce red ion trat Illus Microelectrode Routine use with sample changers and small vials Viscotrode Universal use in viscous media Syntrode with Pt 1000 For use in synthesis and in bioreactorsOrdering informationMicroelectrode, length 113 mm, without cable 6.0234.100Microelectrode, length 168 mm, without cable 6.0234.110Viscotrode, without cable 6.0239.100Syntrode with Pt 1000, length 288 mm, fixed cable 2 m, plug F + 2 x B (4 mm) 6.0248.020Syntrode with Pt 1000, length 438 mm, fixed cable 3 m, plug F + 2 x B (4 mm) 6.0248.030
  26. 26. 26
  27. 27. Metal electrodes 27High-performance metal electrodes for redox and precipitation titration, voltammetry and water determinationaccording to Karl Fischer.
  28. 28. Separate metal and carbon electrodes28 Separate Pt-wire electrode Electrode tip made of Pt-wire (0.8 x 6 mm) Technical specifications Separate Pt-wire electrode Auxiliary electrode for differential potentiometry Shaft material Glass Measuring range -2000...2000 mV Temperature range -20...70 °C Installation length 125 mm Shaft diameter 12 mm Minimum immersion depth 10 mm Electrode plug-in head Metrohm plug-in head B Separate double Pt-sheet electrode Technical specifications For bivoltammetric titrations Separate double Pt-sheet electrode For titration with conductometric endpoint recognition Shaft material Glass Measuring range -2000...2000 mV Temperature range -20...70 °C Installation length 101 mm Shaft diameter 12 mm Minimum immersion depth 10 mm Electrode plug-in head Metrohm plug-in head G Separate metal-ring electrodes Separate Ag-ring electrode Technical specifications For precipitation titrations of halides, sulfides, Separate metal-ring electrodes hydrogen sulfide, mercaptans and cyanides Shaft material Glass Available with or without Ag2S coating Measuring range -2000...2000 mV (specify when ordering) Temperature range -20...80 °C Installation length 125 mm Separate Pt-ring electrode Shaft diameter 12 mm For all standard redox titrations Minimum immersion depth 7 mm Electrode plug-in head Metrohm plug-in head G Separate Au-ring electrode For ferrometry (determination of the chemical oxygen demand, COD) For determination of penicillin and ampicillin For titrations with Hg(NO3)2 For redox titrations in the presence of chromium or iron Separate metal-rod electrodes Consisting of separate electrode shaft made of PP Technical specifications and exchangeable metal-rod (76 mm x 2 mm) made Separate metal-rod electrodes of platinum, silver, gold, tungsten or glassy carbon Total length 162 mm Installation length 140 mm Degree of purity Shaft diameter 12 mm Pt 99.90% Shaft diameter bottom 8 mm Ag 99.99% Electrode plug-in head Metrohm plug-in head B Gold 99.99% W 99.95%
  29. 29. 29Ordering informationSeparate Pt-wire electrode 6.0301.100Separate double Pt-sheet electrode 6.0309.100Separate Ag-ring electrode 6.0350.100Separate Pt-ring electrode 6.0351.100Separate Au-ring electrode 6.0352.100Shaft for separate meta-rod electrode 6.1241.040Electrode rod Pt 6.1248.000Electrode rod Ag 6.1248.010Electrode rod Au 6.1248.030Electrode rod glassy carbon 6.1248.040Electrode rod W 6.1248.050
  30. 30. Titrodes – the maintenance-free metal electrodes30 Pt Titrode / Pt Micro Titrode For redox titrations without alteration of the pH value Technical specifications Titrodes For bromatometry, iodometry and cerimetry in com- Shaft material Glass pliance with Pharm. Europe USP Measuring range -2000...2000 mV Maintenance-free reference system (pH glass pH range 0...14 membrane) Temperature range 0...80 °C Reference system pH glass electrode Ag Titrode / Ag Micro Titrode Installation length 125 mm For precipitation titrations without alteration of the Shaft diameter 12 mm pH value Minimum immersion depth 20 mm For precipitation titrations of halides, sulfides, Electrode plug-in head Metrohm plug-in head G hydrogen sulfide, mercaptans and cyanides For titrations in compliance with Pharm. Europe USP Micro Titrodes Available with or without Ag2S coating Shaft material Glass (specify when ordering) Measuring range -2000...2000 mV Maintenance-free reference system (pH glass pH range 0...14 membrane) Temperature range 0...80 °C Reference system pH glass electrode Au Micro Titrode Installation length 178 mm For ferrometry (determination of the chemical oxygen Shaft diameter 12 mm demand, COD) Shaft diameter bottom 6.4 mm For the determination of penicillin and ampicillin Minimum immersion depth 20 mm For titrations with Hg(NO3)2 Electrode plug-in head Metrohm plug-in head G For redox titrations in the presence of chromium or iron Maintenance-free reference system (pH glass membrane) Ag Titrodes: available with or without coating Depending on the application (see application lists), the use of an Ag Titrode with or without Ag2S or AgBr coating is recommended. We would be happy to supply you with your Ag Titrode with the respective coating at an addi- tional charge; please specify when ordering.
  31. 31. 31 Titrodes High performance in redox and precipitation titrations without alteration of the pH value Micro Titrodes Optimized length and diameter of the lower part of the electrode for use in earlier Metrohm sample changer systemsOrdering informationAg Titrode, without cable 6.0430.100Ag Titrode, with Ag2S coating, without cable 6.0430.100SAg Titrode, with AgBr coating, without cable 6.0430.100BrPt Titrode, without cable 6.0431.100Micro Ag Titrode, without cable 6.0433.110Micro Pt Titrode, without cable 6.0434.110Micro Au Titrode, without cable 6.0435.110
  32. 32. Combined metal electrodes32 Combined Ag-ring electrode For precipitation titrations of halides, sulfides, Technical specifications Combined Ag-ring electrode hydrogen sulfide, mercaptans and cyanides with Shaft material Glass alteration of the pH value Measuring range -2000...2000 mV Available with or without Ag2S coating Temperature range -5...80 °C (specify when ordering) Reference system Ag wire + AgCl Reference electrolyte c(KNO3) = 1 mol/L Combined Pt-ring electrode Diaphragm Ceramic pin For redox titrations with alteration of the pH value Installation length 113 mm Shaft diameter 12 mm Combined Au-ring electrode Minimum immersion depth 15 mm For ferrometry (determination of the chemical oxygen Electrode plug-in head Metrohm plug-in head G demand COD) For determination of penicillin and ampicillin Combined Pt-ring electrode / Au-ring electrode Shaft material Glass Measuring range -2000...2000 mV Temperature range -5...80 °C Reference system LL system Reference electrolyte c(KCl) = 3 mol/L Diaphragm Ceramic pin Installation length 113 mm Shaft diameter 12 mm Minimum immersion depth 15 mm Electrode plug-in head Metrohm plug-in head G Combined Sb electrode Technical specifications For pH titration in very hygroscopic matrices or in Combined Sb electrode matrices containing hydrofluoric acid Shaft material PP Unbreakable plastic shaft pH range 2...11 Temperature range 0...70 °C Reference system LL system Reference electrolyte c(KCl) = 3 mol/L Diaphragm Ceramic pin Installation length 113 mm Shaft diameter 12 mm Minimum immersion depth 15 mm Electrode plug-in head Metrohm plug-in head G
  33. 33. 33 Combined metal-ring electrodes High performance with redox and precipitation titrations with alteration of the pH value Combined Sb electrode pH titration in solutions con- taining hydrofluoric acidOrdering informationCombined Ag-ring electrode, without cable 6.0450.100Combined Ag-ring electrode, with Ag2S coating, without cable 6.0450.100SCombined Pt-ring electrode, without cable 6.0451.100Combined Au-ring electrode, without cable 6.0452.100Combined Sb-ring electrode, without cable 6.0421.100
  34. 34. Electrodes for voltammetry34 The electrodes described in the following can be used in various Metrohm voltammetry instruments: 663 VA Stand, 694 VA Stand, 747 VA Stand, 757 VA Computrace and 797 VA Computrace. MME – Multi-Mode electrode Ordering information Universally applicable working electrode for MME – Multi-Mode Electrode 6.1246.020 polarography and voltammetry Glass capillaries, not silanized, 10 units 6.1226.030 Determination of heavy metal ions, organic Glass capillaries, silanized, 10 units 6.1226.050 substances, anions Determination range: ppm to ppt Universal, robust, durable, easy maintenance, no electrochemical conditioning required Supplied without glass capillaries Glass capillaries Non-silanized glass capillaries Standard capillary for polarography and stripping voltammetry in alkaline solutions For universal use with all pH values in aqueous and non-aqueous solutions Silanized glass capillaries Silanized capillaries for stripping voltammetry in acidic to mildly alkaline solutions Stable drop formation in acidic or mildly alkaline solutions (pH 10). Applications with large mercury drops and/or long accumulation times Long lifetime
  35. 35. RDE – rotating disc electrodesAn RDE consists of a driving axle and an exchangeable 35electrode tip.Ordering informationDrive for rotating disc electrode (RDE) 6.1204.210Drive for rotating disc electrode (RDE) 6.1204.220with titanium axle and mercury contactStopper 6.2709.040Electrode tips for the RDEOrder number Electrode tip Applications Determination range6.1204.180 Ultratrace graphite Analysis of heavy metals with anodic ppb to ppt stripping voltammetry (mercury film technique) and with adsorptive stripping voltammetry (without the use of mercury film)6.1204.110 Glassy carbon Analysis of heavy metals with anodic ppb to ppt stripping voltammetry (mercury film technique), kinetic and thermodynamic studies in electrochemistry6.1204.120 Platinum Kinetic and thermodynamic ppm to ppt Ø 2 mm unpolished studies in electrochemistry6.1204.130 Silver Analysis of halogenides and pseudohalogenides ppb to ppt6.1204.140 Gold Analysis of mercury and other metal ions ppb to ppt with anodic stripping voltammetry6.1204.150 Gold With laterally fitted electrode for arsenic ppb to ppt determination with anodic stripping voltammetry in compliance with Application Bulletin 2266.1204.160 Platinum Analysis of organic additives in electroplating ppm to ppt Ø 2 mm baths with cyclic voltammetric stripping polished technique (CVS), kinetic and thermodynamic studies in electrochemistry6.1204.170 Platinum Analysis of organic additives in galvanic ppm to ppt Ø 3 mm baths with cyclic voltammetric stripping polished technique (CVS), kinetic and thermodynamic studies in electrochemistry6.1204.190 Platinum Analysis of organic additives in galvanic ppm to ppt Ø 1 mm baths with cyclic voltammetric stripping polished technique (CVS), kinetic and thermodynamic shaft in glass studies in electrochemistry analysis6.1204.610 Platinum Analysis of organic additives in electroplating ppm to ppt Ø 2 mm baths with cyclic voltammetric stripping polished technique (CVS), kinetic and thermodynamic shaft in glass studies in electrochemistry
  36. 36. Electrodes for voltammetry36 Reference electrode for Metrohm VA stands Reference electrode made of plastic with ceramic Ordering information diaphragm, filled Universal double-junction reference electrode for Ag / AgCl reference electrode 6.0728.020 voltammetry Electrolyte vessel for Reference electrode 6.1245.010 Inner system filled with c(KCl) = 3 mol/L Aqueous solutions, trace and ultra trace ranges, CVS Low carry-over effects, low blank values Reference electrode made of plastic with ceramic diaphragm, dry Double-junction reference electrode. Reference system dry Ag / AgCl reference electrode (dry) 6.0728.010 Studies in organic solvents with any electrolyte solution Electrolyte vessel for reference electrode 6.1245.010 Low carry-over effects, low blank values LL reference electrode made of plastic with ceramic diaphragm, filled Double-junction reference electrode for the analysis LL-Ag/AgCl reference electrode 6.0728.030 of electroplating baths with cyclic voltammetric Electrolyte vessel for reference electrode 6.1245.010 stripping (CVS) LL-Ag/AgCl (Gel) reference electrode 6.0728.040 Inner system filled with c(KCl) = 3 mol/L Electrolyte vessel for reference electrode 6.1245.010 Very stable reference potential LL reference electrode made of glass, filled Double-junction reference electrode for the studies LL-Ag/AgCl (Gel) reference electrode 6.0730.000 of electroplating baths with cyclic voltammetric stripping (CVS) Very stable reference potential Maintenance-free Reference electrode made of glass with ground joint diaphragm Double-junction reference electrode with dry LL-Ag/AgCl(Gel) reference electrode glass 6.0728.000 reference system Electrolyte vessel for reference electrode 6.1245.010 For aqueous as well as non-aqueous solutions Simple electrolyte replacement, low outflow rate Auxiliary electrodes for Metrohm VA stands Platinum auxiliary electrode Universal auxiliary electrode for voltammetry Platinum auxiliary electrode 6.0343.000 For all applications with the MME as well as with the rotating platinum disc electrode Robust, easy maintenance Glassy carbon auxiliary electrode For all applications with rotating disc electrodes as Auxiliary electrode holder 6.1241.020 well as with the MME Glassy carbon rod 6.1247.000 Inert surface, no contamination of the measuring cell by platinum
  37. 37. 6.1245.010 6.0728.010 + 6.0728.020 37 6.0728.000 6.0728.030 6.0728.040 6.1245.000 6.0730.000 6.0343.000 6.1241.020 6.1247.000 6.1204.3XXWorking electrodes for the Autolab RDEOrder number Electrode tip Applications Determination range6.1204.300 Glassy carbon Analysis of heavy metals with anodic ppb to ppt stripping voltammetry (mercury film technique), kinetic and thermodynamic studies in electrochemistry6.1204.310 Platinum Kinetic and thermodynamic studies in electrochemistry6.1204.320 Gold Analysis of mercury and other metal ions ppm to ppt with anodic stripping voltammetry6.1204.330 Silver Analysis of halogenides and pseudohalogenides ppb to ppt
  38. 38. Electrodes for Karl Fischer titration38 Double platinum-wire indicator electrodes Indicator electrode for volumetric KF determination Technical specifications For KFT equipment in the Titrino line, Titrandos and Measuring range -2000...2000 mV Titro processors Temperature range -20...70 °C For «Ipol»-mode titrations Installation length 96 mm Also for 685 and 737 KF Coulometer Shaft diameter 8 mm Minimum immersion depth 5 mm Electrode plug-in head Metrohm plug-in head G Indicator electrode for 756 and 831 KF Technical specifications coulometer and 851 and 852 Titrandos Measuring range -2000...2000 mV With standard ground joint 14/15 Temperature range -20...70 °C Installation length 101 mm Shaft diameter 12 mm Shaft diameter bottom 8.75 mm Minimum immersion depth 10 mm Electrode plug-in head Metrohm plug-in head G Indicator electrode for KF Sample Changers Technical specifications Fixed cable (length 2 m with plug F) Measuring range -2000...2000 mV Temperature range -20...70 °C Installation length 103 mm Shaft diameter 5.3 mm Minimum immersion depth 10 mm
  39. 39. 39Ordering informationIndicator electrode for 684 + 737 KF Coulometers 6.0338.100Indicator electrode for 756 + 831 KF Coulometers 6.0341.100Indicator electrode for 814 + 815 KF Sample Changers 6.0340.000
  40. 40. Electrodes for Karl Fischer titration40 Generator electrodes Generator electrode with diaphragm Technical specifications for 684 + 737 KF Coulometers Temperature range -20...70 °C Fixed cable (length 1 m, plug H) Installation length 65 mm Shaft diameter 24 mm Minimum immersion depth 15 mm Generator electrode without diaphragm Technical specifications for 684 + 737 KF Coulometers Temperature range -20...70 °C Standard ground joint 29/22 and Metrohm plug-in Installation length 110 mm head G Shaft diameter 24 mm Requires cable 6.2104.120 for connection with KF Minimum immersion depth 15 mm Coulometers Generator electrode with diaphragm for 756 + Technical specifications 831 KF Coulometers and 851 + 852 Titrandos Temperature range -20...70 °C Standard ground joint 29/22 and Metrohm plug-in Installation length 100 mm head G Shaft diameter 24 mm Requires cable 6.2104.120 for connection with KF Minimum immersion depth 15 mm Coulometers Generator electrode without diaphragm for 756 + Technical specifications 831 KF Coulometers and 851 + 852 Titrandos Temperature range -20...70 °C Standard ground joint 29/22 and Metrohm plug-in Installation length 100 mm head G Shaft diameter 24 mm Requires cable 6.2104.120 for connection with KF Minimum immersion depth 15 mm Coulometers
  41. 41. 41 6.0339.000 6.0342.110 Illustrations reduced in size 6.0344.100 6.0345.100Ordering informationGenerator electrode with diaphragm for 684 + 737 KF Coulometers 6.0339.000Generator electrode without diaphragm for 684 + 737 KF Coulometers 6.0342.110Generator electrode with diaphragm for 756 + 831 KF Coulometers 6.0344.100and 851 + 852 TitrandosGenerator electrode without diaphragm for 756 + 831 KF Coulometers 6.0345.100and 851 + 852 Titrandos
  42. 42. 42
  43. 43. 43Electrodes for ion and surfactant analysis
  44. 44. Ion-selective electrodes44 Polymer-membrane electrodes with replaceable electrode tip for K+ and NO3– Robust construction High selectivity due to ionophores immobilized in the membrane Short preparation time after conditioning in a standard solution For aqueous solutions Crystal-membrane electrodes Robust construction Can also be used for brief periods in organic solvents Simple cleaning and renewal of electrode surface with polishing set Sodium-selective glass membrane electrode For sodium determination in simple aqueous media Polymer-membrane electrodes for Na+ and Ca2+ Robust construction High selectivity due to ionophores immobilized in the membrane Short preparation time after conditioning in a standard solution For aqueous solutions Ammonia-selective gas-membrane electrode Robust construction Short preparation time after conditioning in a standard solution The gas-permeable Teflon membrane ensures high selectivity and prevents interferences by the measur- ing solution Rapid exchange of Teflon membrane thanks to ready-for-use certified membrane modules
  45. 45. 45 Ion Article no. Membrane Min. Installation- Shaft- Tempera- Measure- pH range material immersion length diameter ture range ment range depth (mm) (mm) (mm) (°C) (mol/L) Ag+ 6.0502.180 Crystal 1 123 12 0...80 10–7...1 2...8 Br– 6.0502.100 Crystal 1 123 12 0...50 5*10–6...1 0...14 Ca2+ 6.0508.110 Polymer 1 123 12 0...40 5*10–7...1 2...12 Cd2+ 6.0502.110 Crystal 1 123 12 0...80 10–7...10–1 2...12 Cl– 6.0502.120 Crystal 1 123 12 0...50 5*10–5...1 0...14 CN– 6.0502.130 Crystal 1 123 12 0...80 8*10–6...10–2 10...14 Cu2+ 6.0502.140 Crystal 1 123 12 0...80 10–8...10–1 2...12 F– 6.0502.150 Crystal 1 123 12 0...80 10–6...sat. 5...7 I– 6.0502.160 Crystal 1 123 12 0...50 5*10–8...1 0...14 K+ 6.0504.110 Polymer1 1 123 12 0...40 10–6...1 2.5...11 Na+ 6.0501.100 Glass 15 863 12 0...80 10–5...1 5...9 Na+ 6.0508.100 Polymer 1 123 12 0...40 10–6...1 3...12 NH4+ 6.0506.100 Gas membrane 1 123 12 0...50 5*10–7...1 11 NO3– 6.0504.120 Polymer1 1 123 12 0...40 7*10–6...1 2.5...11 Pb2+ 6.0502.170 Crystal 1 123 12 0...80 10–6...10–1 4...7 S2– 6.0502.180 Crystal 1 123 12 0...80 10–7...1 2...12 SCN– 6.0502.190 Crystal 1 123 12 0...50 5*10–6...1 2...101 Electrode with exchangeable electrode tip2 Electrode shaft 6.1241.050 and electrode tip 6.1205.040 must be ordered separately.3 Up to standard ground joint
  46. 46. Accessories for ion-selective electrodes46 LL ISE reference, without cable 6.0750.100 Double-junction Ag/AgCl reference electrode with fixed LL ISE Reference A stable, reproducible reference potential is very impor- ground-joint diaphragm and optimized length for sample tant at low ion concentrations, low ionic strengths and changer applications. Standard bridge electrolyte: especially with repeated determinations using sample c(KCl) = 3 mol/L. changer systems. For this reason Metrohm recom- mends reference electrodes with a fixed ground-joint diaphragm for working with ion-selective electrodes. In addition to a constant electrolyte outflow of approx. 5...30 μL/h, these electrodes are also considerably less influenced by either the ionic strength of the sample solution or the stirring speed than other types of refer- ence electrodes. Polymer-membrane electrodes with exchangeable electrode tip 6.1241.050 Electrode shaft for polymer- membrane electrodes 6.0504.XXX 6.1205.020 Polymer-membrane electrode tip K+ Illustration reduced in size 6.1205.030 Polymer-membrane electrode tip NO3– 6.1255.000 Membrane module kit for 6.0506.100, consisting of 3 membrane modules + 50 mL inner electrolyte Other accessories 6.2802.000 Polishing set for crystal-membrane electrodes 6.0502.1X0 Illustration reduced in size (approx. 2 g AI2O3 and polishing cloth) Ion standards (250 mL each), c(Ion) = 0.1000 ± 0.0005 mol/L (traceable to NIST) KBr 6.2301.000 NaCl 6.2301.010 Cu(NO3)2 6.2301.020 NaF 6.2301.030 KI 6.2301.040 KCl 6.2301.060 CaCl2 6.2301.070 KNO3 6.2301.080 Pb ion standard 1.000 g/L ± 0.5% (250 mL) Pb (1.000 g/L) 6.2301.100

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