SODIUM METABISULPHITE Extra Pure
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Chemical Specifications
Appearance
White crystalline powder
Assay (iodometric)
96.5 - 100%
Assay (as SO2; iodometric)
65 - 67.4%
Identity (acc. to pharmacopoeias)
Passes test
pH (5% solution in water)
3.5 - 5.0
Appearance of solution
Passes test
Insoluble matter in water
Max 0.025%
Residual solvents
Passes test
Chloride (Cl)
Max 0.02%
Thiosulphate (S2O3)
Max 0.05%
Heavy metal (as Pb)
Max 0.002%
Arsenic (As)
Max 0.0004%
Iron (Fe)
Max 0.002%