|
Appearance
|
Colorless crystals/White crystalline powder
|
|
Assay (oxidimetric)
|
99.5 - 101%
|
|
Neutrality
|
Passes test
|
|
Insoluble matter
|
Max 0.01%
|
|
Chloride (Cl)
|
Max 0.002%
|
|
Sulphate (SO4)
|
Max 0.01%
|
|
Ammonium (NH4)
|
Max 0.002%
|
|
Heavy metals (by ICP-OES)
|
Max 0.002%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Sodium (Na)
|
Max 0.02%
|
|
Substances darkened by hot sulphuric acid
|
Passes test
|