SODIUM METABISULPHITE Extra Pure

Short Name: SODIUM METABISULPHITE

Other Names: Sodium pyrosulfite, Sodium disulfite

Confirming to BP, USP

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%