|
Appearance
|
White crystalline powder
|
|
Assay (acidimetric)
|
99.5 - 100.5%
|
|
Identity
|
Passes test
|
|
Appearance of solution
|
Passes test
|
|
Alkali hydroxides and alkali hydrogen carbonates
|
Passes test
|
|
Chloride (Cl)
|
Max 0.0125%
|
|
Sulphate (SO4)
|
Max 0.025%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Arsenic (As)
|
Max 0.0003%
|
|
Copper (Cu)
|
Max 0.0025%
|
|
Iron (Fe)
|
Max 0.005%
|
|
Mercury (Hg)
|
Max 0.0001%
|
|
Potassium (K)
|
Max 0.04%
|
|
Lead (Pb)
|
Max 0.0005%
|
|
Zinc (Zn)
|
Max 0.0025%
|
|
Loss on drying (at 105°C)
|
12 - 15%
|