Specifications:

Characteristic           :      Requirement

• Definition : contains not less than 98. 0 per cent and not more than 105. 0 per cent of cahpo42h2o
• Description : white crystalline powder odourless
• Solubility : practically insoluble in water and in ethnol (95%), it dissoloves in dilute hydrochloric acid, and in nitric acid.
• Identification

a) phosphates : positive

b) calcium salts  : positive

• Acid insoluble substance %max : 0.1
• Arsenic  ppm max : 10
• Barium : to pass the test
• Heavy metals   ppm max : 40
• Iron   ppm max : 400
• Carbonates : to pass the test
• Chloride   ppm max : 1250
• Sulphate  % max : 0.5
• Reducing substances : to pass the test
• Nitrate : to pass the test
• Proteinous  impurities : nil
• Loss on  ignition : 24. 5 to 26. 5%  at  500 c
• Monocalcium and tricalcium phosphates : not less than 11. 0 ml and not more than 12. 5 ml of 1 m hydrochloric is required.
• Assay % of cahpo4. 2h2o : 98. 0 to 105. 0