|
Appearance
|
Colorless to white crystals
|
|
Assay
|
Min 98%
|
|
pH (5% solution in water)
|
5.0 - 9.0
|
|
Chloride (Cl)
|
Max 0.01%
|
|
Sulphate (SO4)
|
Max 0.02%
|
|
Heavy metal (as Pb)
|
Max 0.002%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Substance not precipitated by ammonium oxalate (as SO4)
|
Max 0.3%
|