|
Appearance
|
White crystalline powder, crystals, granules or chunks
|
|
Assay (by NaOH titration)
|
Min. 98.0%
|
|
Heavy metal (as Pb)
|
Max. 0.0005%
|
|
Insoluble matter
|
Max. 0.005%
|
|
Residue on ignition
|
Max. 0.01%
|
|
Chloride (Cl)
|
Max. 0.001%
|
|
Sulphate (SO4)
|
Max. 0.005%
|
|
Iron (Fe)
|
Max. 0.0005%
|