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Appearance
|
White crystalline or granular powder
|
|
Assay (on anhydrous basis)
|
Min 99.5%
|
|
Identity
|
Passes test
|
|
Appearance of solution
|
Passes test
|
|
Insoluble matter in water
|
Max 0.01%
|
|
Moisture (at 300°C)
|
Max 0.5%
|
|
Chloride (Cl)
|
Max 0.002%
|
|
Phosphate and silicate (as SiO2)
|
Max 0.005%
|
|
Total sulphur (as SO4)
|
Max 0.005%
|
|
Heavy metal (as Pb)
|
Max 0.0005%
|
|
Arsenic (As)
|
Max 0.0005%
|
|
Calcium (Ca)
|
Max 0.03%
|
|
Iron (Fe)
|
Max 0.0005%
|
|
Potassium (K)
|
Max 0.01%
|
|
Magnesium (Mg)
|
Max 0.005%
|