POTASSIUM METABISULPHITE Extra Pure

Short Name: POTASSIUM METABISULPHITE

Other Names: Potassium pyrosulfite; Dipotassium disulfite

Chemical Specifications

Appearance : White crystalline powder

Assay (iodometric) : 95 - 99.9%

Iodometric,SO2 : 54.8 - 57.6%

Appearance of solution : Passes test

pH (5% solution in water) : 3 - 4.5

Chloride (Cl) : Max 0.05%

Heavy metal (as Pb) : Max 0.001%

Thiosulphate : Passes test

Copper (Cu) : Max 0.0025%

Zinc (Zn) : Max 0.0025%

Iron (Fe) : Max 0.002%

Selenium (Se) : Max 0.0005%

Mercury (Hg) : Max 0.0001%