What is the Sodium metabisulfite?

Sodium metabisulfite is white crystalline powder with a sulfur smell, while it's Molecular Formula is Na2O5S2. white crystalline powder with a sulfur smell Pharmaceutic aid (antioxidant).

What is the CAS number for Sodium metabisulfite?

The CAS number of Sodium metabisulfite is 7681-57-4.

What is Sodium metabisulfite (7681-57-4) used for?

Sodium metabisulfite (chemical formula: Na2S2O5) appears as a white crystalline or powder solid with a slight sulfur odor. It is toxic upon inhalation and can strongly irritate skin and tissue. It can be decomposed to release toxic oxide fumes of sulfur and sodium upon high temperature. It can be mixed with water to form a corrosive acid. It is generally used as disinfectant, antioxidant, and preservative agent as well as a laboratory reagent. As a kind of food additive, it can be used as a preservative and antioxidant in food. It can also be applied to the wine and beer making. Moreover, it can be used to sanitize the equipment of homebrew and winemaking as a cleaning agent. It also have various kinds of other applications, e.g. being applied to photography, as an excipients in some tablets, for water treatment, as a source of SO2 in wine, as a bactericide and as a bleaching reagent as well as reducing agent. It can be manufactured through the evaporation of a sodium bisulfite which has been saturated with sulfur dioxide. It should be warned that sodium metabisulfite has certain acute effects on the respiratory system, eyes and skin. In severe case, it can cause breathing difficulty and even pulmonary damage which finally leads to death. Therefore, effective protective measures and attention should be taken during the operation.sodium metabisulfite powderInChI:InChI=1/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2

Factory supply Sodium metabisulfite 7681-57-4 with sufficient stock and high standard

Product Details;

CasNo： 7681-57-4

Molecular Formula： Na₂O₅S₂

Appearance： white crystalline powder with a sulfur smell

Factory supply Sodium metabisulfite 7681-57-4 with sufficient stock and high standard

Molecular Formula:Na2O5S2
Molecular Weight:190.10
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

Sodium metabisulfite(Cas 7681-57-4) Usage and Factory

Chemical Description	Sodium metabisulfite (Na₂S₂O₅) is an inorganic compound commonly used as a disinfectant, antioxidant, and preservative across several industries. It appears as a white powder with a faint rotten egg odor (due to sulfur dioxide release), and it forms sodium bisulfite when dissolved in water.
Manufacturing Method	Sodium metabisulfite is produced by reacting sulfur dioxide with sodium carbonate (soda ash) or sodium hydroxide, followed by purification and crystallization. The reaction can be represented as: Na2CO3 + 2SO2 → Na2S2O5 + CO2.
Uses	Food Industry: Used as a preservative (E223) in dried fruits, baked goods, jams, and potato products. It helps inhibit microbial growth and oxidation of food products. Pharmaceutical Industry: Functions as an antioxidant to stabilize active ingredients in medications, including parenteral (injectable), oral, and topical formulations. Disinfectant: Employed as a sterilizing agent in water treatment plants, especially for purifying wastewater.
Hazards and Safety	Toxicity: Sodium metabisulfite poses inhalation risks, especially for individuals with asthma or sulfite allergies. It may irritate the respiratory tract and cause allergic reactions. Carcinogenicity: Some studies suggest genotoxic effects, but it is not classified as a confirmed carcinogen. Regulatory Status: It is Generally Recognized As Safe (GRAS) by the FDA for use as a food additive. It is also approved by the European Union and listed in various global databases, including the FDA's Inactive Ingredients Database.
Hazardous Substance Classification	Sodium metabisulfite is included in the hazardous substance list due to its classification by organizations like ACGIH (American Conference of Governmental Industrial Hygienists), DOT (Department of Transportation), NIOSH (National Institute for Occupational Safety and Health), and IARC (International Agency for Research on Cancer).
Purification Methods	Sodium metabisulfite is purified through crystallization techniques, including dissolving in water and recovering crystals through evaporation or precipitation with alcohol solutions.

InChI:InChI=1/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2

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7681-57-4 Relevant articles

Recent advances in sulfonylation reactions using potassium/sodium metabisulfite

Shengqing Ye a, Min Yang ORCID logob and Jie Wu

, Chem. Commun., 2020, 56, 4145-4155

Recently, sulfonylation reactions using potassium/sodium metabisulfite as the sulfur dioxide surrogate have been developed rapidly. In most cases, the transformations go through radical processes with the insertion of sulfur dioxide under mild conditions. Additionally, transition metal catalysis is applied in the reactions for the synthesis of sulfonyl-containing compounds. Among the approaches, photoinduced conversions under visible light or ultraviolet irradiation are also involved. In this updated report, the insertion of sulfur dioxide from potassium metabisulfite or sodium metabisulfite is summarized.

Allergic contact dermatitis caused by sodium metabisulfite: a challenging allergen. A case series and literature review

Juan García-Gavín, Joana Parente, An Goossens

, Contact dermatitis, Volume67, Issue5 November 2012 Pages 260-269

One hundred and twenty-four (4.5%) of 2763 patients patch tested positively to sodium metabisulfite. The most frequent localizations of the lesions were the face (40.3%) and the hands (24.2%). Six patients also reported systemic symptoms. Thirteen cases (10.5%) were occupational, 10 of them presenting with hand eczema. Sodium metabisulfite was the single allergen found in 76 cases (61.3%). The reactions were considered to be relevant in 80 cases (64.5%), of which 11 were occupational.

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