|
Appearance
|
Almost white powder
|
|
Assay (as Na; HClO4 titration, on dried basis)
|
6.5 - 9.5%
|
|
Appearance of solution
|
Passes test
|
|
Residue on ignition (as SO4)
|
20 - 29.3%
|
|
pH (1% solution)
|
6.5 - 8.0
|
|
Identity
|
Passes test
|
|
Viscosity (2% in water; 20°C)
|
400 - 800 cps
|
|
Insoluble matter in water
|
Passes test
|
|
Loss on drying (at 105°C)
|
Max 10.0%
|
|
Chloride (Cl)
|
Max 0.25%
|
|
Sodium glycolate
|
Max 0.4%
|
|
Heavy metal (as Pb)
|
Max 0.002%
|
|
Arsenic (As)
|
Max 0.0003%
|
|
Iron (Fe)
|
Max 0.02%
|