|
Appearance
|
White crystalline powder
|
|
Assay (on anhydrous basis)
|
Min 99.0%
|
|
Heavy metal (as Pb)
|
Max 0.0005%
|
|
Thiosulphate
|
Max 0.005%
|
|
Free alkali
|
Max 0.02%
|
|
Loss on drying (at 105°C)
|
Max 0.2%
|
|
pH (5 % solution)
|
6.0-9.0
|
|
Chloride & bromide (as Cl)
|
Max 0.01%
|
|
Iodate (IO3)
|
Max 0.0005%
|
|
Phosphate (PO4)
|
Max 0.001%
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Arsenic (As)
|
Max 0.00001%
|
|
Barium (Ba)
|
Max 0.002%
|
|
Calcium (Ca)
|
Max 0.001%
|
|
Iron (Fe)
|
Max 0.0003%
|
|
Magnesium (Mg)
|
Max 0.001%
|
|
Sodium (Na)
|
Max 0.03%
|