|
Appearance
|
White crystalline powder
|
|
Assay
|
Min. 97.0%
|
|
Insoluble matter in water
|
Max. 0.005%
|
|
Chloride (Cl)
|
Max. 0.005%
|
|
Arsenic (As)
|
Max. 0.0001%
|
|
Phosphate (PO4)
|
Max. 0.002%
|
|
Thiosulphate (S2O3)
|
Max. 0.05%
|
|
Heavy metal (as Pb)
|
Max. 0.001%
|
|
Iron (Fe)
|
Max. 0.002%
|