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Appearance
|
White crystalline powder.
|
|
Assay
|
99 - 101%
|
|
pH (5% solution in water)
|
7.5 - 9.0
|
|
Loss on drying (at 130°C)
|
39 - 40.5%
|
|
Chloride (Cl)
|
Max 0.005%
|
|
Nitrogen compounds (as N)
|
Max 0.005%
|
|
Phosphate (PO4)
|
Max 0.001%
|
|
Sulphate (SO4)
|
Max 0.003%
|
|
Calcium & magnesium (as Ca)
|
Max 0.005%
|
|
Heavy metal (as Pb)
|
Max 0.0006%
|
|
Aluminium (Al)
|
Max 0.005%
|
|
Arsenic (As)
|
Max 0.0002%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Potassium (K)
|
Max 0.01%
|
|
Reducing substance
|
Passes test
|