|
Appearance
|
Colourless crystals
|
|
Assay
|
99.0 - 102.0%
|
|
Insoluble matter in water
|
Max. 0.01%
|
|
pH (5% solution in water)
|
4.1 - 4.5
|
|
Chloride (Cl)
|
Max. 0.0005%
|
|
Sulphate (SO4)
|
Max. 0.003%
|
|
Total nitrogen (N)
|
Max. 0.001%
|
|
Heavy metal (as Pb)
|
Max. 0.0005%
|
|
Calcium (Ca)
|
Max. 0.005%
|
|
Iron (Fe)
|
Max. 0.0005%
|
|
Potassium (K)
|
Max. 0.005%
|