Appearance (Form)
Crystalline powder
Solubility (Turbidity) 5% hot aq. solution
Clear
Solubility (Colour) 5% hot aq. solution
Colourless
Assay (by Neutralization)
min. 99.7%
Insoluble matter
max. 0.23%
Chloride (CI)
max. 0.003%
Sulphate (SO4)
max. 0.003%
Iron (Fe)
max. 0.0001%
Heavy Metals (Pb)
max. 0.0005%
Phosphate (PO4)
max. 0.001%
Copper (Cu)
max. 0.0005%
Ammonium (NH4)
max. 0.002%
Potassium (K)
max. 0.005%
Magnesium (Mg)
max. 0.004%
Calcium (Ca)
max. 0.02%
Aluminium (Al)
max. 0.0002%
Arsenic (As)
max. 0.0002%
Sulphur compunds
max. 0.015%
Limit of organics
max. 0.25%
Normal carbonate
Passes test
