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Fertilizer analysis presentation
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Fertilizer analysis

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Fertilizer analysis

  1. 1. FERTILIZER LABORATORY
  2. 2. FERTILIZER Aim : to determine the contain of element e.g. K, Mg, P, Ca in the fertilizer followed by the specification. Instrument used: Inductively Coupled Plasma(ICP)- determine all element at one time include heavy metal if necessary. Atomic Absorption Spectrophotometer(AAS) & UV Spectrophotometer - one element at a time.
  3. 3. Determination of pH value Determination of moisture content Determination of potassium Determination of magnesium Determination of phosphorus Trace element FERTILIZE R ANALYSIS
  4. 4. DETERMINATION OF POTASSIUM AND MAGNESIUM Why we need potassium and magnesium? POTASSIUM - provide the ionic environment for metabolic process in cytosol.(growth regulation) - potassium ions (K+) for protein synthesis and opening and closing of stomata. MAGNESIUM - part of chlorophyll in plant for photosynthesis
  5. 5. METHOD • Method for the determination of magnesium Determination of water-soluble magnesium content (MgO) • Principle Magnesium in magnesium sulphate fertilizers is extracted in boiling water and the magnesium content determined by atomic absorption spectrophotometer. • Reference: MS 417: Part 6: 1994
  6. 6. PROCEDURE •Sample preparation -registration -drying -grinding •Weigh the sample •Add distilled water and HCl
  7. 7. • Digest the solution using hot plate at boiling point around 20minutes • Leave to cool • Transfer into volumetric flask and dilute to the mark (250ml) • Mixed the solution and filter in plastic vial • Further dilution(100ml) • Add strontium nitrate(5ml) and dilute to the mark • To remove phosphate from magnesium and calcium and prevent interference from other elements
  8. 8. • Preparation for Atomic Absorption Spectrophotometer • Standard stock solution - Potassium dihydrogen sulphate solution - Magnesium sulphate solution • For 1000ppm,weigh 4.3928g. • Dry in oven for 2 hours • Undergo further dilution(m1v1=m2v2) • 0, 0.25, 0.5, 0.75, 1.00 and 1.25 ppm
  9. 9. • Pre-calibrate the AAS with standard stock solution • Run the AAS • Then, we can determine the concentration of the solution
  10. 10. DETERMINATION OF PHOSPHORUS Why phosphorus important to plant? • Essential to stimulate early plant growth and hastens the maturity. • Development of root health. • Classified as macronutrient.
  11. 11. Methodology: • molybdovanadate method (yellow method). Reference: •MS 417: Part 4: 1994 Apparatus: Spectrophotometer. Principle: •Amount of light transmitted (yellow colour) dependent on the concentration of phosphorus. •Spectophotometric absorption curve from known standard phosphorus solutions determined in unknown solution.
  12. 12. Standard stock solution:  Potassium dihydrogen phosphate (4.3928g in 1L)  1000ppm 100ppm 0ppm 2ppm 4ppm 8ppm 10ppm Reagent used:  Molybdovanadate reagent: Ammonium molybdate (100ml) mixed together with ammonium vanadate (150ml). Aqua regia:  Mixing the HCl & HNO3 together.
  13. 13. Procedure • Sample preparation and weigh the samples (fertilizer) • Add distilled water. • Add 10ml HCl and 5ml HNO3 and boil. • transfer into volumetric flask. • Mark-up with distilled water then filter.
  14. 14. • 1ml of sample solution is pipette into 100ml volumetric flask. • Add Molybdovanadate reagent and diluted to the mark with distilled water. • Prepare calibration standard (0,2,4,6 & 8 ppm) from the stock solution (1000ppm) and take reading after 30 minutes.
  15. 15.  Determine phosphate at acidic colour at pH ± 2.6  Double acid method is used.  We put HCl and HNO3 to convert all polyphosphate (P2O7) to orthophosphate (PO4 3-).  phosphate + metavanadate = phosphomolybdate acid + water. (yellow colour)
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