|
Appearance
|
White crystalline powder
|
|
Assay
|
98 - 100.5%
|
|
pH (5% solution in water)
|
8.7 - 9.3
|
|
Substance insoluble in water
|
Max 0.2%
|
|
Chloride (Cl)
|
Max 0.02%
|
|
Sulphate (SO4)
|
Max 0.05%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Arsenic (As)
|
Max 0.0002%
|
|
Copper (Cu)
|
Max 0.0025%
|
|
Iron (Fe)
|
Max 0.002%
|
|
Loss on drying (at 130°C)
|
Max 5.0%
|