CAS number : 7681-57-4
Molecular Weight: 190.11
Chemical Formula: Na2S2O5
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DESCRIPTIONSpecifications of Sodium Metabisulfite Pure grade
|Assay as Na2S2O5||Not less than 97.0% Na2S2O5|
|Insoluble matter||0.005% max|
|Heavy metals (as Pb)||10 ppm|
|Iron (Fe)||50 ppm|
Sodium Metabisulfite USP NF
Disulfurous acid, disodium salt.
Disodium pyrosulfite [CAS Number 7681-57-4]
Sodium Metabisulfite contains an amount of Na2S2O5 equivalent to not less than 65.0 percent and not more than 67.4 percent of SO2.
Identification: A solution (1 in 20) responds to the tests for Sodium 191 and for Sulfite.
Limit of chloride: Dissolve 1.0 g in 10 mL of water, filter, if necessary, through a small chloride free filter, and add 6 mL of 30 percent hydrogen peroxide. Add 1 N sodium hydroxide until the solution is slightly alkaline to phenolphthalein, dilute with water to 100 mL, and mix. Dilute 2.0 mL of this solution with water to 20 mL, and add 1 mL of nitric acid and 1 mL of silver nitrate TS. Mix, allow to stand for 5 minutes protected from direct sunlight, and compare the turbidity, if any, with that produced from a 2-mL aliquot of a control (prepared by diluting 0.71 mL of 0.020 N hydrochloric acid to 100 mL) in an equal volume of total solution containing the quantities of reagents used in the test : any turbidity produced by the test specimen does not exceed that of the control preparation (0.05%).
Iron: the limit is 0.002%.
Limit of thiosulfate: Mix 2.2 g with 10 mL of 1 N hydrochloric acid in a 50-mL beaker. Boil gently for 5 minutes, cool, and transfer to a small test tube. Any turbidity is not greater than that produced by 0.10 mL of 0.10 N sodium thiosulfate, similarly treated (0.05%).
Heavy metals: the limit is 0.002%.
Sodium Metabisulfite FCC Food Grade
CAS: [CAS Number 7681-57-4]
Sodium Metabisulfite occurs as colorless crystals or as a white to yellow, crystalline powder. It is freely soluble in water and slightly soluble in alcohol. Its solutions are acid to litmus.
Function: Preservative; antioxidant.
Identification: A 1:10 aqueous solution gives positive tests for Sodium and for Sulfite.
Assay: Not less than 90.0% and not more than 100.5% of Na2S2O5.
Iron: Not more than 10 mg/kg.
Lead: Not more than 2 mg/kg.
Selenium: Not more than 5 mg/kg.
Sodium Metabisulfite Analytical Reagent
CAS Number: 7681-57-4
Assay: 97% Na2S2O5 minimum
Insoluble matter: 0.005%
Chloride (Cl): 0.05%
Thiosulfate (S2O3): 0.05%
Heavy metals (as Pb): 0.001%
Iron (Fe): 0.002%.
Sodium Metabisulfite Uses
Reducing agents for the chemical, pharmaceutical, photographic, textile industries and as food additives.
Auxiliary for water and sewage treatment.
Bleach for the paper and pulp industry.
Auxiliary for the film and photographic industry.
Sodium Metabisulfite Uses (Food)
Bleaching agent (e.g. candies, cake) loose agent (e.g. bread, cracker, etc).
Antiseptic and germicide (e.g. fruit juice, tinned food, etc).
Inhibitor and freshening agent (e.g. day lily, seafood, fruit and vegetable, etc).
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