31448

Sodium metabisulfite

puriss. p.a., ACS reagent, reag. Ph. Eur., dry, 98-100.5%

• Synonym(s): Sodium disulfite, Sodium pyrosulfite
• Linear Formula: Na₂S₂O₅
• CAS Number: 7681-57-4
• Molecular Weight: 190.11
• EC Number: 231-673-0
• MDL number: MFCD00167602
• UNSPSC Code: 12352302
• PubChem Substance ID: 329753770
• NACRES: NB.24

Properties

• grade: ACS reagent; puriss. p.a.
• Agency: reag. Ph. Eur.
• Assay: 98-100.5%
• form: powder
• quality: dry
• impurities: ≤0.01% thiosulfate (S₂O₃)
• pH: 3.5-5.0 (20 °C, 5%)
• mp: >300 °C (lit.)
• anion traces: chloride (Cl^-): ≤50 mg/kg
• cation traces: As: ≤0.5 mg/kg; Ca: ≤50 mg/kg; Cd: ≤50 mg/kg; Co: ≤50 mg/kg; Cu: ≤5 mg/kg; Fe: ≤5 mg/kg; K: ≤100 mg/kg; Ni: ≤50 mg/kg; Pb: ≤5 mg/kg; Zn: ≤10 mg/kg
• SMILES string: [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O
• InChI: 1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2
• InChI key: HRZFUMHJMZEROT-UHFFFAOYSA-L

Description

General description

Sodium metabisulfite (MBS, Sodium disulfite) is an inorganic salt. It is the sodium salt of disulphurous (pyrosulfurous) acid. It is widely used in textile dyeing, photography and paper industry. It is also commonly added to various food products and wines as a preservative.

Application

Sodium metabisulfite may be used as an initiator during the cross-linking polymerization of polybutadiene in the cores of the vesicle membranes. It may be added as an antioxidant during the preparation of stock solutions of 6-hydroxydopamine in various studies.

Safety Information

• Pictograms: GHS05,GHS07
• Signal Word: Danger
• Hazard Statements: H302,H318
• Precautionary Statements: P264 - P270 - P280 - P301 + P312 - P305 + P351 + P338 - P501
• Hazard Classifications: Acute Tox. 4 Oral - Eye Dam. 1
• Supplementary Hazards: EUH031
• Storage Class Code: 13 - Non Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable