P2522

Potassium disulfite

≥98%

• Synonym(s): Potassium metabisulfite, Potassium pyrosulfite
• Linear Formula: K₂S₂O₅
• CAS Number: 16731-55-8
• Molecular Weight: 222.32
• EC Number: 240-795-3
• MDL number: MFCD00167605
• UNSPSC Code: 12352302
• PubChem Substance ID: 329820140
• NACRES: NA.55

Properties

• Quality Level: 200
• Assay: ≥98%
• form: powder
• SMILES string: [K+].[K+].[O-]S(=O)S([O-])(=O)=O
• InChI: 1S/2K.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2
• InChI key: RWPGFSMJFRPDDP-UHFFFAOYSA-L

Description

General description

Potassium disulfite (Potassium metabisulfite, PMB) is an inorganic salt with antimicrobial properties. It is a sulfiting agent that prevents browning of foods. Its genotoxic and cytotoxic effect has been assessed. PMB undergoes hydrolysis to form potassium bisulfite.

Application

Potassium disulfite has been used in a protocol for the modification of the polydimethylsiloxane (PDMS) polymer surfaces.
It may be used in the following processes:

• Chemical etching of poly(vinylidene fluoride) in β-phase (β-PVDF) irradiated films.
• Decolorization during the synthesis of 2-iodopyrimidine derivatives.
• Palladium-catalyzed aminosulfonylation of aryl halides.

Safety Information

• Pictograms: GHS05
• Signal Word: Danger
• Hazard Statements: H318
• Precautionary Statements: P280 - P305 + P351 + P338
• Hazard Classifications: Eye Dam. 1
• Supplementary Hazards: EUH031
• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1