|
Appearance
|
White powder or colorless crystals
|
|
Assay (on anhydrous basis)
|
98.0 - 103.0%
|
|
Identification as per IP
|
Passes test
|
|
pH (5% solution in water)
|
4.1 - 4.5
|
|
Insoluble substances
|
Max 0.2%
|
|
Chloride (Cl)
|
Max 0.014%
|
|
Sulphate (SO4)
|
Max 0.15%
|
|
Aluminium, calcium and related elements
|
Passes test
|
|
Arsenic (As)
|
Max 0.0008%
|
|
Heavy metal
|
Max 0.002%
|
|
Water (H2O)
|
18.0 - 26.5%
|