Sodium metabisulfite (CAS 7681-57-4) — formula Na2O5S2, molecular weight 189.90 g/mol; category fine chemicals.
| CAS Number | 7681-57-4 |
|---|---|
| Molecular Formula | Na2O5S2 |
| Molecular Weight | 189.90 g/mol |
| Applications | Uses: CIR ingredient: Sodium Metabisulfite, Sodium and potassium metabisulfite are used as antioxidants in photographic film development. [Kanerva, p. 1637] Used as an antioxidant (food preservative, pharmaceutical aid, silage preservative, [HSDB] Used in the pickling stage of leather production, [PMID 21938525], Leather Tanning and Processing [Category: Industry], Photographic Processing [Category: Other], For sodium metabisulfite (USEPA, OPP Pesticide Code: 111409) ACTIVE products with label matches., SRP: Registered for use in the U.S. but approved pesticide uses may change periodically and so federal, state and local authorities must be consulted for currently approved uses., Sodium Metabisulfite functions as reducing agents in cosmetic formulations. ... Sodium Bisulfite, and Sodium Metabisulfite, also, function as antioxidants., In foods, as preservative, lab reagent, Sulfiting agents are used primarily to reduce or prevent spoilage and discoloration as well as to bleach food starches, condition dough for some baked goods, control fermentation of wine, and soften corn kernels during the wet-milling process., For more Uses (Complete) data for SODIUM METABISULFITE (10 total), please visit the HSDB record page., Use Classification: EPA Safer Chemical Functional Use Classes -> Preservatives and Antioxidants, Safer Chemical Classes -> Yellow triangle - The chemical has met Safer Choice Criteria for its functional ingredient-class, but has some hazard profile issues, Food Additives -> ANTIOXIDANT, FLOUR_TREATMENT_AGENT, PRESERVATIVE -> JECFA Functional Classes, Cosmetics -> Preservative, Industry Uses: Reducing agent, Preservative, Not Known or Reasonably Ascertainable, Etching agent, Flotation agent, Anti-scaling agent, Intermediate, Oxidizing agent, Dye, Leaching agent, Processing aids not otherwise specified, Surfactant (surface active agent), Chemical reaction regulator, Antioxidant, Consumer Uses: Solvent, Reducing agent, Household Products: Information on 69 consumer products that contain Sodium metabisulfite in the following categories is provided:, • Inside the Home, • Landscaping, Yard, • Personal Care, Methods of Manufacturing: Sodium disulfite is produced by treating 50-70% sodium hydroxide or a suspension of sodium carbonate with sulfur-dioxide-containing gases in saturated sodium hydrogen sulfite solution. The sodium disulfite is removed by centrifugation and then dried., Formed when sodium bisulfite undergoes thermal dehydration. It may also be prepared by passing sulfur dioxide over sodium carbonate., Impurities: Sodium metabisulfite usually contains small amounts of sodium sulfite and sodium sulfate., Formulations, Preparations: Grades: FCC, The commercial product has a content of about 97% Na2S2O5, 1-2% Na2SO3, and about 1% Na2SO4., Available in photographic, food and NF, National Formulary, grades, It may be considered to be the anhydride of sodium bisulfite, and is reportedly the chief constituent of the commercial grade of the latter compound., For more Formulations, Preparations (Complete) data for SODIUM METABISULFITE (16 total), U.S. Production: 2023: 55, 000, 000 - <70, 000 lb, 2022: 55, 2021: 55, 2020: 55, Production volumes for non-confidential chemicals reported under the Inventory Update Rule. [Table#1145], Production volume for non-confidential chemicals reported under the 2006 Inventory Update Rule. Chemical: Disulfurous acid, sodium salt. Aggregated National Production Volume: 10 to < 50 million lbs., General Manufacturing Information: All Other Chemical Product and Preparation Manufacturing, Food, beverage, and tobacco product manufacturing, Paper Manufacturing, Organic Fiber Manufacturing, Textiles, apparel, and leather manufacturing, All Other Basic Organic Chemical Manufacturing, Other (requires additional information), Services, Mining (except Oil and Gas) and support activities, Pharmaceutical and Medicine Manufacturing, Utilities, Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing, All Other Basic Inorganic Chemical Manufacturing, Plastics Product Manufacturing, Transportation Equipment Manufacturing, Primary Metal Manufacturing, Soap, Cleaning Compound, and Toilet Preparation Manufacturing, Disulfurous acid, sodium salt (1:2): ACTIVE, Chief constituent of commercial dry sodium bisulfite with which most of its properties and uses are practically identical., Effluent containing Na2S2O5 5.7 ppm was circulated to wash flue gas in a press scrubber at 200 °For 2 hr. Spent liquid was filtered to obtain filtrate with Na2S2O5 2.4 ppm., Of 17 antioxidants evaluated for use in epinephrine injection solutions, sodium metabisulfite was found to be most effective., Post-emergence application of 1 kg Na2S2O5, ha increased the yield of sugar beet by 5.9%, and its sugar content by 17.57%, whereas the ash and N contents were decreased., Listed as Generally Considered Safe (GRAS) by the FDA |
| Category | Basic Chemical Raw Materials |
Documented applications: Uses: CIR ingredient: Sodium Metabisulfite, Sodium and potassium metabisulfite are used as antioxidants in photographic film development. [Kanerva, p. 1637] Used as an antioxidant (food preservative, pharmaceutical aid, silage preservative, [HSDB] Used in the pickling stage of leather production, [PMID 21938525], Leather Tanning and Processing [Category: Industry], Photographic Processing [Category: Other], For sodium metabisulfite (USEPA, OPP Pesticide Code: 111409) ACTIVE products with label matches., SRP: Registered for use in the U.S. but approved pesticide uses may change periodically and so federal, state and local authorities must be consulted for currently approved uses., Sodium Metabisulfite functions as reducing agents in cosmetic formulations. ... Sodium Bisulfite, and Sodium Metabisulfite, also, function as antioxidants., In foods, as preservative, lab reagent, Sulfiting agents are used primarily to reduce or prevent spoilage and discoloration as well as to bleach food starches, condition dough for some baked goods, control fermentation of wine, and soften corn kernels during the wet-milling process., For more Uses (Complete) data for SODIUM METABISULFITE (10 total), please visit the HSDB record page., Use Classification: EPA Safer Chemical Functional Use Classes -> Preservatives and Antioxidants, Safer Chemical Classes -> Yellow triangle - The chemical has met Safer Choice Criteria for its functional ingredient-class, but has some hazard profile issues, Food Additives -> ANTIOXIDANT, FLOUR_TREATMENT_AGENT, PRESERVATIVE -> JECFA Functional Classes, Cosmetics -> Preservative, Industry Uses: Reducing agent, Preservative, Not Known or Reasonably Ascertainable, Etching agent, Flotation agent, Anti-scaling agent, Intermediate, Oxidizing agent, Dye, Leaching agent, Processing aids not otherwise specified, Surfactant (surface active agent), Chemical reaction regulator, Antioxidant, Consumer Uses: Solvent, Reducing agent, Household Products: Information on 69 consumer products that contain Sodium metabisulfite in the following categories is provided:, • Inside the Home, • Landscaping, Yard, • Personal Care, Methods of Manufacturing: Sodium disulfite is produced by treating 50-70% sodium hydroxide or a suspension of sodium carbonate with sulfur-dioxide-containing gases in saturated sodium hydrogen sulfite solution. The sodium disulfite is removed by centrifugation and then dried., Formed when sodium bisulfite undergoes thermal dehydration. It may also be prepared by passing sulfur dioxide over sodium carbonate., Impurities: Sodium metabisulfite usually contains small amounts of sodium sulfite and sodium sulfate., Formulations, Preparations: Grades: FCC, The commercial product has a content of about 97% Na2S2O5, 1-2% Na2SO3, and about 1% Na2SO4., Available in photographic, food and NF, National Formulary, grades, It may be considered to be the anhydride of sodium bisulfite, and is reportedly the chief constituent of the commercial grade of the latter compound., For more Formulations, Preparations (Complete) data for SODIUM METABISULFITE (16 total), U.S. Production: 2023: 55, 000, 000 - <70, 000 lb, 2022: 55, 2021: 55, 2020: 55, Production volumes for non-confidential chemicals reported under the Inventory Update Rule. [Table#1145], Production volume for non-confidential chemicals reported under the 2006 Inventory Update Rule. Chemical: Disulfurous acid, sodium salt. Aggregated National Production Volume: 10 to < 50 million lbs., General Manufacturing Information: All Other Chemical Product and Preparation Manufacturing, Food, beverage, and tobacco product manufacturing, Paper Manufacturing, Organic Fiber Manufacturing, Textiles, apparel, and leather manufacturing, All Other Basic Organic Chemical Manufacturing, Other (requires additional information), Services, Mining (except Oil and Gas) and support activities, Pharmaceutical and Medicine Manufacturing, Utilities, Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing, All Other Basic Inorganic Chemical Manufacturing, Plastics Product Manufacturing, Transportation Equipment Manufacturing, Primary Metal Manufacturing, Soap, Cleaning Compound, and Toilet Preparation Manufacturing, Disulfurous acid, sodium salt (1:2): ACTIVE, Chief constituent of commercial dry sodium bisulfite with which most of its properties and uses are practically identical., Effluent containing Na2S2O5 5.7 ppm was circulated to wash flue gas in a press scrubber at 200 °For 2 hr. Spent liquid was filtered to obtain filtrate with Na2S2O5 2.4 ppm., Of 17 antioxidants evaluated for use in epinephrine injection solutions, sodium metabisulfite was found to be most effective., Post-emergence application of 1 kg Na2S2O5, ha increased the yield of sugar beet by 5.9%, and its sugar content by 17.57%, whereas the ash and N contents were decreased., Listed as Generally Considered Safe (GRAS) by the FDA.
Sodium metabisulfite is a high-value fine compound with CAS registry number 7681-57-4 and molecular formula Na2O5S2 (molecular weight 189.90 g/mol), belonging to the fine chemicals segment of chemical raw materials.
CAS number: 7681-57-4
Its molecular formula Na2O5S2 comprises 2 Na, 5 O, 2 S atoms.
Also known as: Sodium metabisulfite · 焦亚硫酸钠
Category: fine chemicals
The CAS registry number of Sodium metabisulfite is 7681-57-4.
Molecular formula Na2O5S2, molecular weight 189.90 g/mol.
It is also registered under: Sodium metabisulfite, 焦亚硫酸钠.
Recorded applications: Uses: CIR ingredient: Sodium Metabisulfite, Sodium and potassium metabisulfite are used as antioxidants in photographic film development. [Kanerva, p. 1637] Used as an antioxidant (food preservative, pharmaceutical aid, silage preservative, [HSDB] Used in the pickling stage of leather production, [PMID 21938525], Leather Tanning and Processing [Category: Industry], Photographic Processing [Category: Other], For sodium metabisulfite (USEPA, OPP Pesticide Code: 111409) ACTIVE products with label matches., SRP: Registered for use in the U.S. but approved pesticide uses may change periodically and so federal, state and local authorities must be consulted for currently approved uses., Sodium Metabisulfite functions as reducing agents in cosmetic formulations. ... Sodium Bisulfite, and Sodium Metabisulfite, also, function as antioxidants., In foods, as preservative, lab reagent, Sulfiting agents are used primarily to reduce or prevent spoilage and discoloration as well as to bleach food starches, condition dough for some baked goods, control fermentation of wine, and soften corn kernels during the wet-milling process., For more Uses (Complete) data for SODIUM METABISULFITE (10 total), please visit the HSDB record page., Use Classification: EPA Safer Chemical Functional Use Classes -> Preservatives and Antioxidants, Safer Chemical Classes -> Yellow triangle - The chemical has met Safer Choice Criteria for its functional ingredient-class, but has some hazard profile issues, Food Additives -> ANTIOXIDANT, FLOUR_TREATMENT_AGENT, PRESERVATIVE -> JECFA Functional Classes, Cosmetics -> Preservative, Industry Uses: Reducing agent, Preservative, Not Known or Reasonably Ascertainable, Etching agent, Flotation agent, Anti-scaling agent, Intermediate, Oxidizing agent, Dye, Leaching agent, Processing aids not otherwise specified, Surfactant (surface active agent), Chemical reaction regulator, Antioxidant, Consumer Uses: Solvent, Reducing agent, Household Products: Information on 69 consumer products that contain Sodium metabisulfite in the following categories is provided:, • Inside the Home, • Landscaping, Yard, • Personal Care, Methods of Manufacturing: Sodium disulfite is produced by treating 50-70% sodium hydroxide or a suspension of sodium carbonate with sulfur-dioxide-containing gases in saturated sodium hydrogen sulfite solution. The sodium disulfite is removed by centrifugation and then dried., Formed when sodium bisulfite undergoes thermal dehydration. It may also be prepared by passing sulfur dioxide over sodium carbonate., Impurities: Sodium metabisulfite usually contains small amounts of sodium sulfite and sodium sulfate., Formulations, Preparations: Grades: FCC, The commercial product has a content of about 97% Na2S2O5, 1-2% Na2SO3, and about 1% Na2SO4., Available in photographic, food and NF, National Formulary, grades, It may be considered to be the anhydride of sodium bisulfite, and is reportedly the chief constituent of the commercial grade of the latter compound., For more Formulations, Preparations (Complete) data for SODIUM METABISULFITE (16 total), U.S. Production: 2023: 55, 000, 000 - <70, 000 lb, 2022: 55, 2021: 55, 2020: 55, Production volumes for non-confidential chemicals reported under the Inventory Update Rule. [Table#1145], Production volume for non-confidential chemicals reported under the 2006 Inventory Update Rule. Chemical: Disulfurous acid, sodium salt. Aggregated National Production Volume: 10 to < 50 million lbs., General Manufacturing Information: All Other Chemical Product and Preparation Manufacturing, Food, beverage, and tobacco product manufacturing, Paper Manufacturing, Organic Fiber Manufacturing, Textiles, apparel, and leather manufacturing, All Other Basic Organic Chemical Manufacturing, Other (requires additional information), Services, Mining (except Oil and Gas) and support activities, Pharmaceutical and Medicine Manufacturing, Utilities, Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing, All Other Basic Inorganic Chemical Manufacturing, Plastics Product Manufacturing, Transportation Equipment Manufacturing, Primary Metal Manufacturing, Soap, Cleaning Compound, and Toilet Preparation Manufacturing, Disulfurous acid, sodium salt (1:2): ACTIVE, Chief constituent of commercial dry sodium bisulfite with which most of its properties and uses are practically identical., Effluent containing Na2S2O5 5.7 ppm was circulated to wash flue gas in a press scrubber at 200 °For 2 hr. Spent liquid was filtered to obtain filtrate with Na2S2O5 2.4 ppm., Of 17 antioxidants evaluated for use in epinephrine injection solutions, sodium metabisulfite was found to be most effective., Post-emergence application of 1 kg Na2S2O5, ha increased the yield of sugar beet by 5.9%, and its sugar content by 17.57%, whereas the ash and N contents were decreased., Listed as Generally Considered Safe (GRAS) by the FDA.
Category: Basic Chemical Raw Materials.
Independent reference data for Sodium metabisulfite (CAS 7681-57-4), compiled from public chemistry databases.
| CAS Registry Number | 7681-57-4 |
|---|---|
| PubChem CID | 656671 |
| Molecular formula | Na2S2O5 |
| UNII (FDA) | 4VON5FNS3C |
| Molecular Weight | 190.11 |
|---|---|
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 6 |
| Rotatable Bond Count | 0 |
| Exact Mass | 189.89825401 |
| Monoisotopic Mass | 189.89825401 |
| Topological Polar Surface Area | 125 |
| Heavy Atom Count | 9 |
| Solubility | 54 % (NIOSH, 2024) |
|---|---|
| Solubility | 66.7 g/100 g water at 25 °C |
| Solubility | 54% |
| Density | 2.36 g/cm³ |
| Density | 1.4 |
| Density | 1.4 @25 °C |
| LogP | -3.7 |
| Decomposition | 150 °C |
| pH | 4,0-5,5 (10 % aqueous solution) |
Sodium metabisulfite; 7681-57-4; Sodium pyrosulfite; Sodium disulfite; Disodium pyrosulfite; Natrii disulfis; Campden Tablets; Disodium metabisulfite; Natrium pyrosulfit; Natriummetabisulfit; sodium pyrosulphite; Sodium bisulfite anhydrous; Natrium metabisulfurosum; Sodium pyrosulfite (Na2S2O5); Disodium pentaoxodisulfate; 4VON5FNS3C
| Regulatory & Food Contact | FDA Substance added to food: ANTIMICROBIAL AGENT, ANTIOXIDANT, COLOR OR COLORING ADJUNCT, DOUGH STRENGTHENER, ANTIOXIDANT; FLOUR_TREATMENT_AGENT; PRESERVATIVE: Food Additives ANTIMICROBIAL AGENT, ANTIOXIDANT, COLOR OR COLORING ADJUNCT, DOUGH STRENGTHENER, FLOUR TREATING AGENT, FREEZIN JECFA ADI: 0-0.7 mg/kg bw TRS 891-JECFA 51/30 FAS 42-JECFA 51/95 |
|---|---|
| GHS notification summary | 0.4% (11 / 3060) |
| GHS notification summary | 0.4% (11 / 3060) |
|---|---|
| Reported hazard statements | H302, H318, H317, H334, H335, H402, H412, H320 |
H302: Harmful if swallowed [Warning Acute toxicity, oral]
H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]
Sodium Metabisulphite Food Grade · CAS 7681-57-4 · Na2S2O5. UNII 4VON5FNS3C. Solubility: 54 % (NIOSH, 2024); Solubility: 66.7 g/100 g water at 25 °C; Solubility: 54%.
Source: PubChem / Wikidata; the batch COA governs where values differ.
Supplier: Jinan Shenghe Chemical Co., Ltd.
中文页面: 焦亚硫酸钠