|
Appearance
|
Colourless crystals
|
|
Assay (acidimetric)
|
98.5 - 100.5%
|
|
pH (5% solution in water)
|
9.0 - 9.3
|
|
Chloride (Cl)
|
Max. 0.01%
|
|
Sulphate (SO4)
|
Max. 0.01%
|
|
Sodium dihydrogen phosphate (NaH2PO4)
|
Max. 1.0%
|
|
Heavy metal (as Pb)
|
Max. 0.001%
|
|
Iron (Fe)
|
Max. 0.001%
|
|
Arsenic (As)
|
Max. 0.0001%
|
|
Substance reducing KMnO4 (as O)
|
Max. 0.02%
|
|
Loss on drying (at 130°C)
|
57 - 61%
|
|
Water (by KF)
|
57 - 61%
|