|
Appearance
|
Colorless crystalline powder
|
|
Assay
|
99 - 102%
|
|
Insoluble matter
|
Max 0.005%
|
|
pH (5% solution in water; 20°C)
|
7 - 8.5
|
|
Chloride (Cl)
|
Max 0.0005%
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Phosphate (PO4)
|
Max 0.001%
|
|
Ammonium (NH4)
|
Max 0.002%
|
|
Heavy metal (as Pb)
|
Max 0.0005%
|
|
Iron (Fe)
|
Max 0.0005%
|
|
Copper (Cu)
|
Max 0.0005%
|
|
Calcium (Ca)
|
Max 0.004%
|