|
Appearance
|
White crystalline powder
|
|
Assay (acidimetric; on dried basis)
|
98 - 100.5%
|
|
Appearance of solution
|
Passes test
|
|
Identification as per pharma
|
Passes test
|
|
pH (5% solution in water)
|
4.2 - 4.5
|
|
Chloride (Cl)
|
Max 0.02%
|
|
Sulphate (SO4)
|
Max 0.03%
|
|
Fluoride (F)
|
Max 0.001%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Arsenic (As)
|
Max 0.0002%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Sodium (Na)
|
Max 0.1%
|
|
Reducing substances by KMnO4 (as O)
|
Passes test
|
|
Insoluble substances and organic matter
|
Max 0.2%
|
|
Loss on drying (at 130°C)
|
Max 1.0%
|