|
Appearance
|
White crystalline powder
|
|
Assay (argentometric)
|
Min 99%
|
|
Sulphate (SO4)
|
Max 0.015%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Arsenic (As)
|
Max 0.0003%
|
|
Lead (Pb)
|
Max 0.001%
|
|
Calcium (Ca)
|
Max 0.02%
|
|
Iron (Fe)
|
Max 0.002%
|
|
Copper (Cu)
|
Max 0.0025%
|
|
Zinc (Zn)
|
Max 0.0025%
|
|
Residue on ignition (at 800°C)
|
Max 0.1%
|
|
Iodide, Bromide (I, Br)
|
Passes test
|
|
pH (5% solution)
|
4.5-5.5
|
|
Identity
|
Passes test
|
|
Clarity of solution
|
Passes test
|
|
Acidity or alkalinity
|
Passes test
|
|
Loss on drying (at 105°C)
|
Max 0.5%
|
|
Thiocyanate (SCN)
|
Passes test
|