12619

Potassium disulfite

puriss., meets analytical specification of Ph.Eur., BP, NF, FCC, E224, 95.0-101.0% (iodometric), powder, 51.8-57.6% sulfur dioxide

• 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: 329749774
• NACRES: NA.21

Properties

• grade: puriss.
• Assay: 95.0-101.0% (iodometric)
• form: powder
• quality: meets analytical specification of Ph.Eur., BP, NF, FCC, E224
• impurities: organic volatile impurities, complies (GC); residual solvents, in accordance; ≤0.001% heavy metals (as Pb); ≤0.08% thiosulfate (S₂O₃); 51.8-57.6% sulfur dioxide
• pH: 3.5-4.5 (20 °C, 5%)
• anion traces: chloride (Cl^-): ≤100 mg/kg
• cation traces: As: ≤2 mg/kg; Cu: ≤20 mg/kg; Fe: ≤10 mg/kg; Hg: ≤1 mg/kg; Pb: ≤2 mg/kg; Se: ≤5 mg/kg; Zn: ≤20 mg/kg
• suitability: in accordance for appearance of solution
• 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

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