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pH METER
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  • 1.  Presenter:Presenter: Dr S KamalakarDr S Kamalakar PuripandaPuripanda DEPT OF SAMHITADEPT OF SAMHITA SDMCA&HSDMCA&H pH METERpH METER
  • 2.   The pH meter was invented in 1934 by the American chemist Arnold O. Beckman (1900-2004) to measure the sourness of lemons  A simple and speedy device to measure the acidity and alkalinity of a fluid. A pH meter acts as a volt meter that measures the electrical potential difference between a pH electrode and a reference electrode and displays the result in terms of the pH value of the solution in which they are immersed. INTRODUCTION
  • 3.   The logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per litre; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic); pH (Potential of Hydrogen) The formal definition of pH is the negative logarithm of the hydrogen ion activity. pH = -log[H+]
  • 4.  An acid can be defined as a proton donor, a chemical that increases the concentration of hydrogen ions in solution. HCL----------H+ + CL-  A corrosive liquid with a pH less than 7; a solution of in water of a substance that releases hydrogen ions  A base can be defined as a proton acceptor, a chemical that reduces the concentration of hydrogen ions in solution. KOH……..K+ + OH-  A corrosive liquid with a pH greater than 7; a solution of in water of a substance that releases hydroxyl ions Acids and Bases
  • 5.  A pH measurement system consists of High input meter 2 probes Buffer powder/capsules for calibration Distil water pH Meter
  • 6. Probe 2Probe 1
  • 7. 1.Glass electrode: It consists thin bulb of special glass blown(lithium) at the end of the glass tube,and the bulb is filled with dilute acid for example decinormal HCL acid connected to a silver chloride electrode 2.Calomel electrode: It consists of a glass tube containing saturated KCL connected to platinum wires through mercury (mercury chloride) 3.Reference junction: typically made of porous ceramic or porus teflon Probe 1 consists of 3 parts (2 electrodes) ELECTRODE: A conductor used to make electrical contact with some part of a circuit Probe 1 1 2 3
  • 8. Probe 2 CHECKING FOR SOLUTION’S TEMPERATURE 2 PROBES ARE CONNECTED TO HIGH INPUT pH READING MTER
  • 9.  The act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument BUFFER POWDER/CAPSULES
  • 10. 1.High input pH reading meter
  • 11.   A voltmeter in the probe measures the difference between the voltages of the two electrodes.  The meter then translates the voltage difference into pH and displays it on the screen.  Before taking a pH measurement the meter must be calibrated using a solution of known pH. pH Meter
  • 12.   Temperature compensation is connected within the instrument because pH electrodes are temperature sensitive.  Temperature compensation only corrects for the change in the output of the electrode, not for the change in the actual solution.  Buffers are solutions that have constant pH values and the ability to resist changes in pH.  They are used to calibrate the pH meter. Temperature and Buffers
  • 13.   1.The 2 probes should connect to pH reading meter  Connect the power pack of 230v to the pH meter  Dip the electrode in a standard solution of pH and set the temparature and take reading (The 1st probe should be calibrate with different buffer solutions for rule out the errors of the electrode(buffer solution:buffer powder + distil water).Then should check the solution temperature with 2nd probe)  Remove buffers wash and wipe the electrode and dip it in the desireble solution and take the reading. METHOD OF USING
  • 14.   An electrical potencial devolops when one liquid is brought into contact with another one ,but a membrane is needed to keep such liquid aparts  A ph meter measures essentially the electro – chemicall potencial between a known liquid inside the glass electrode and unknown liquid outside  Because the thin glass bulb allows mainly the agile and small hydrogen ions to interact with the glass,the glass electrode measures the electro chemical potential of hydrogen ions. How a pH meter works
  • 15. PH EXAMPLE 0 HCL 1 GASTRIC JUICES 2 LEMON JUICE 3 ORANGE JUICE 4 COLA 5 COFEE 6 RAIN WATER 7 PURE WATER 8 SEA WATER 9 BAKING SODA 10 ANTACIDS 12 DETERGENT 13 OVEN CLEANER 14 NAOH
  • 16.   SWEAT…4 -6  VAGINAL FLUIDS…..4.50 -5  SALIVA…..6.2 – 7.4  BLOOD……7.35 – 7.45  URINE…..MORNING 6.5 – 7,THEN 7.5 – 8.0  INTESTINAL FLUIDS….7.41  SEMEN….7.35 – 7.40  LYMPH …..7.4 – 9.0  EYE TEARS…7.1 – 7.4  PANCREATIC JUICES…..8.5 BODY FLUIDS
  • 17.  THANK U REFERENCES: RESEARCH METHDOLOGY FOR AYURVEDIC SCHOLARS-DR.S.SURESHBABU TABER’S CYCLOPEDIC MEDICAL DICTIONARY EDITION 20 INTERNET IMAGES COLLECTED FROM RASASHASTRA DEPT SDMCAH

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