13459

Sodium metabisulfite

puriss., meets analytical specification of Ph. Eur., BP, NF, FCC, E223, dry, 97-100.5%

• 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: 329750183
• NACRES: NA.21
• form: powder or crystals

Properties

• grade: puriss.
• Quality Level: 200
• Assay: 97-100.5%
• form: powder or crystals
• quality: dry; meets analytical specification of Ph. Eur., BP, NF, FCC, E223
• composition: SO₂, 65.0-67.4%
• impurities: residue of solvents, complies; ≤0.02% thiosulfate (S₂O₃)
• pH: 3.5-5.0 (20 °C, 5%)
• mp: >300 °C (lit.)
• anion traces: chloride (Cl^-): ≤100 mg/kg
• cation traces: As: ≤2 mg/kg; Cu: ≤10 mg/kg; Fe: ≤10 mg/kg; Hg: ≤1 mg/kg; Pb: ≤2 mg/kg; Se: ≤5 mg/kg; Zn: ≤10 mg/kg
• suitability: complies for appearance of solution
• 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 as reducing agent in textile and photography industry. It is commonly added to various foods and wines as preservative.

Application

Sodium metabisulfite was used to initiate the cross-linking of polybutadiene in the cores of the vesicle membranes by free radical polymerization in solution. It has been used to prevent the oxidation (as 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: 11 - Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable