Potassium pyrosulfite/Potassium metabisulfite

English Name: potassium metabisulfite; Potassium pyrosulfite

Other names: potassium pyrosulfite; Potassium trisulfide; Potassium metathiosulfate; Potassium bisulfite; Potassium metabisulfite 

CAS No.: 16731-55-8

K2S2O5=222.33

grade: ar

Content: ≥ 95.0%

Water insoluble matter: ≤ 0.005%

Chloride: ≤ 0.005%

Clarity test: ≤ No.4

Heavy metals: ≤ 0.001%

Arsenic: ≤ 0.0001%

Iron: ≤ 0.0005%

 Physicochemical properties : white crystal or crystalline powder. It smells of sulfur dioxide. Sensitive to humidity. Acidic reaction. Sulfur dioxide escapes in contact with acid. It gradually oxidizes into sulfate in the air, and oxidizes faster in wet air. If ground into powder, it can burn when it is hot. Soluble in water, insoluble in ethanol and ether. Decompose at 190 ℃. The relative density is 2.34. Irritating.

Purpose: biochemical research. Reductant. Developer. Bacterial inhibitors. Antioxidant. Prepare sulphurous acid.

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