Sodium Metabisulfite

Base Information

• Chemical Name: Sodium Metabisulfite
• CAS No.: 7681-57-4
• Deprecated CAS: 15771-29-6,1287784-10-4,7757-74-6,2242622-57-5,7757-74-6
• Molecular Formula: Na2O5S2
• Molecular Weight: 190.10
• Hs Code.: 2832 10 00
• European Community (EC) Number: 231-673-0
• ICSC Number: 1461
• UN Number: 1759
• UNII: 4VON5FNS3C
• DSSTox Substance ID: DTXSID0029684
• Nikkaji Number: J44.049C
• Wikipedia: Sodium_metabisulfite,Sodium disulfite
• Wikidata: Q284549
• NCI Thesaurus Code: C77498
• RXCUI: 36696
• ChEMBL ID: CHEMBL2016976
• Mol file: 7681-57-4.mol

Synonyms:Na(2)S(2)O(5);sodium disulfite;sodium metabisulfite;sodium metabisulfite, 35S2-labeled cpd;sodium pyrosulfite

Chemical Property of Sodium Metabisulfite

Chemical Property:

• Appearance/Colour: white crystalline powder with a sulfur smell
• Melting Point: >170 °C (begins at 150 °C)
• PSA: 124.92000
• Density: 1.48 g/cm³
• LogP: 0.27220
• Storage Temp.: Store at RT.
• Sensitive.: Air & Moisture Sensitive
• Solubility.: 540 g/L (20°C)
• Water Solubility.: 540 g/L (20 ºC)
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 6
• Rotatable Bond Count: 0
• Exact Mass: 189.89825401
• Heavy Atom Count: 9
• Complexity: 136
• Transport DOT Label: Corrosive

Purity/Quality:

99% ^*data from raw suppliers

Sodium metabisulfite ^*data from reagent suppliers

Safty Information:

• Pictogram(s): Xn,Xi
• Hazard Codes: Xn,Xi
• Statements: 22-31-41-36/37/38-52
• Safety Statements: 26-39-46-36-16

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Other Classes -> Sulfites
• Canonical SMILES: [O-]S(=O)S(=O)(=O)[O-].[Na+].[Na+]
• Inhalation Risk: Evaporation at 20 °C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed.
• Effects of Short Term Exposure: The substance is severely irritating to the gastrointestinal tract. The substance is irritating to the eyes and respiratory tract. Inhalation may cause asthma-like reactions.
• Chemical Composition: Sodium metabisulfite (SMB) is an inorganic sodium salt composed of sodium and disulfite ions in a 2:1 ratio.
• Antioxidant and Preservative: SMB is widely used as an antioxidant and antibacterial preservative in various food products such as fruits, vegetables, seafood, and alcoholic beverages. It is also utilized in the pharmaceutical industry to improve the stability of active principles in medications.
• Adverse Effects: Improper use of SMB can lead to several adverse effects, including genotoxicity, lipid peroxidation, and cell death. High oral doses of SMB have been associated with increased cell damage indexes and genotoxic effects on mouse tissues. In rat stomach tissue, high levels of SMB can induce apoptosis and lipid peroxidation. Furthermore, SMB has been linked to nerve cell damage through excitotoxicity.
• Industrial Applications: SMB has been utilized in industrial processes, such as replacing lime as a pyrite depressant in the rougher flotation stage of Cu-Mo-Fe ores in Chile. It has also been shown to selectively depress the float ability of chalcopyrite in flotation processes.
• Use in Edible Coatings: SMB has been incorporated into edible coatings to improve the appearance and conservation of foods. These coatings act as barriers to moisture and oxygen, delaying spoilage, and increasing safety.
• Synthetic Reactions: SMB has been utilized in sulfonylation reactions as a sulfur dioxide surrogate, leading to the synthesis of S-aryl thiosulfonates, which are important synthetic building blocks in organic chemistry.