|
Appearance
|
White hygroscopic crystalline powder
|
|
Assay
|
Min 99%
|
|
pH (5% solution in water; 25°C)
|
8.7 - 9.6
|
|
Chloride (Cl)
|
Max 0.003%
|
|
Heavy metal (as Pb)
|
Max 0.0005%
|
|
Insoluble matter
|
Max 0.01%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Loss on drying (at 105°C)
|
Max 1%
|
|
Nitrogen compounds (as N)
|
Max 0.001%
|
|
Sodium (Na)
|
Max 0.5%
|
|
Sulphate (SO4)
|
Max 0.005%
|