|
Appearance
|
White crystalline powder
|
|
Assay (after ignition)
|
99.5-100.5%
|
|
Identity
|
Passes test
|
|
Appearance of solution
|
Passes test
|
|
Acidity or alkalinity
|
Passes test
|
|
pH (5 % solution)
|
5.0 - 8.0
|
|
Insoluble matter
|
Max 0.005%
|
|
Bromide (Br)
|
Max 0.005%
|
|
Iodide (I)
|
Max 0.001%
|
|
Ferrocyanide [(Fe(CN)6]4-
|
Max 0.0001%
|
|
Chlorate and nitrate (NO3)
|
Max 0.003%
|
|
Nitrite (NO2)
|
Passes test
|
|
Phosphate (PO4)
|
Max 0.0005%
|
|
Sulphate (SO4)
|
Max 0.001%
|
|
Total nitrogen (N)
|
Max 0.0005%
|
|
Heavy metals (by ICP-OES)
|
Max 0.0005%
|
|
Arsenic (As)
|
Max 0.00004%
|
|
Barium (Ba)
|
Max 0.001%(passes test)
|
|
Calcium (Ca)
|
Max 0.002%
|
|
Copper (Cu)
|
Max 0.0002%
|
|
Iron (Fe)
|
Max 0.0002%
|
|
Magnesium (Mg)
|
Max 0.001%
|
|
Magnesium and alkali earth metals
|
Max 0.01%
|
|
Potassium (K)
|
Max 0.005%
|
|
Loss on drying (at 105°C; 2 hrs)
|
Max 0.5%
|