SODIUM METABISULFITE (Sodium Pyrosulfite)

SODIUM METABISULFITE
PRODUCT IDENTIFICATION
CAS NO.	7681-57-4
EINECS NO.	231-673-0
FORMULA	Na₂S₂O₅
MOL WT.	190.10
H.S. CODE	2832.10.0000
TOXICITY
SYNONYMS	Dinatriumdisulfit; Disulfito de disodio; Disulfite de disodium;
Disodium disulfite; Disodium Salt Pyrosulfurous Acid; Disulfurous acid, disodium salt; Pyrosulfurous acid, disodium salt; Sodium Metabisulfite; Sodium disulfite; Sodium Pyrosulfite;
SMILES	[Na+].[Na+].[O-]S(=O)S(=O)(=O)[O-]
CLASSIFICATION	Disinfectant, Homebrewing
EXTRA NOTES	Overall Carcinogenic Evaluation: Group 3 Other RN: 15771-29-6, 1287784-10-4
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE	white crystalline powder with odor of sulfur dioxide
MELTING POINT	150 C (Decomposes)
BOILING POINT
SPECIFIC GRAVITY	1.48
SOLUBILITY IN WATER	Freely soluble (470g/l)
pH	3.5 - 5
VAPOR DENSITY
AUTOIGNITION
NFPA RATINGS	Health: 2; Flammability: 0; Reactivity: 0
REFRACTIVE INDEX
FLASH POINT
STABILITY	Stable under ordinary conditions. Hygroscopic.
EXTERNAL LINKS & GENERAL DESCRIPTION
USA.gov - Sodium metabisulfite Wikipedia Linking - Sodium metabisulfite Google Scholar Search - Sodium metabisulfite U.S. National Library of Medicine - Sodium metabisulfite PubChem Compound Summary - Sodium metabisulfite KEGG (Kyoto Encyclopedia of Genes and Genomes) - Sodium metabisulfite http://www.ncbi.nlm.nih.gov/ - Sodium metabisulfite Material Safety Data Sheet - Sodium metabisulfite Hazardous Substances Data Bank - Sodium metabisulfite EPA - Substance Registry Services - Sodium metabisulfite Local: Sodium Metabisulfite is a white to slightly yellowish crystalline powder with sulfur dioxide odor; readily soluble in water. Sodium metabisulfite containing more than 65.0% SO₂ w/w releases sulfur dioxide gas when mixed with water. It forms a bisulfite adduct with aldehyde and with ketones to a sulfonic acid. It is used to purify or isolate aldehydes and ketones. Sodium metabisulfite's reductive and sulfonating properties provide versatile applications. It is used as an oxygen scavenger to eliminate the dissolved oxygen in waste water and in pipes. Bisulfite is a reductive bleaching agent. It reduces carbonyl and alcohol groups, which function as colorants of the substances. It is used in bleaching mechanical paper pulp, cotton, wool and kaolin clay. Additional applications include as a preservative (antioxidant), a hair waving agent, and Ensiling agent. Bisulfites are used in industries concerned with leather processing, food and beverage processing, gas purification, water treatment to remove excess chlorine, textiles and pulp processing, and many others. It is used as a reducing agent in chemical manufacturing. It is an alternative to sulfur dioxide which is used in sterlization of equipment. Examples of other metallic bisulfite Calcium Bisulfite [13780-03-5, Ca(HSO₃)₂] A white powder, used as an antiseptic and in pulping process. Potassium Bisulfite [1310-61-8, KHSO₃] Also called potassium acid sulfite, white, water-soluble powder with sulfur dioxide odor; insoluble in alcohol; decomposes when heated; used as an antiseptic and reducing chemical, tanning, and bleaching. Magnesium Bisulfite [13774-25-9, Mg(HSO₃)₂]
SALES SPECIFICATION
TECH GRADE
APPEARANCE	White to slightly yellowish crystalline powder
CONTENT	98.0% min
SO₂	65.0% min
Na₂S₂O₄	2.0% max
INSOLUBLES IN WATER	0.05% max
PARTICLE SIZE	85% (mesh 200)
pH	4 -4.6
Fe	5ppm max
FOOD GRADE
APPEARANCE	White to slightly yellowish crystalline powder
CONTENT	98.0% min
SO₂	65.0% min
Na₂S₂O₄	2.0% max
INSOLUBLES IN WATER	0.05% max
PARTICLE SIZE	85% (mesh 200)
HEAVY METALS	10ppm max
As	1ppm max
Fe	5ppm max
pH	4.5 - 5.5
TRANSPORTATION
PACKING	25kgs or big bag
HAZARD CLASS
UN NO.
BISULFITE ADDUCTS WITH ALDEHYDE GROUPS
Acetone Sodium Bisulfite: [CAS RN: 540-92-1, (CH₃)₂C(OH)SO₃Na] Crystals that have a slight sulfur dioxide odor and slightly fatty feel; freely soluble in water, decomposed by acids; used in textile dyeing and printing. Sodium Formaldehyde Bisulfite [CAS RN: 870-72-4 CH₃NaO₄S] A compound used as a fixing agent for fibers containing keratin, in metallurgy for flotation of lead-zinc ores, and in photography Indole-3-acetaldehyde Sodium Bisulfite [CAS RN: 20095-27-6, C₁₀H₉NO · NaHSO₃] Glutaraldehyde bis(sodium bisulfite) [CAS RN: 7420-89-5, C₅H₁₂O₈S₂] used as an antiseptic Menadione Sodium Bisulfite [CAS RN: 57414-02-5, C₁₁H₉NaO₅S] a water-soluble derivative of menadione provitamin which converted in the body to active vitamin K. Glyoxal sodium bisulfite [CAS RN: 332360-05-1, [CH(OH)SO₃Na]₂] nonaqueous form of glyoxal
SAFETY INFORMATION
HAZARD OVERVIEW	GHS (Globally Harmonised System) Classification: Acute toxicity (Oral), Acute toxicity (Dermal), Serious eye damage, Acute aquatic toxicity. Hazard statements: Harmful if swallowed. May be harmful in contact with skin. Causes serious eye damage. Harmful to aquatic life. Potential Health Effects; Eyes - Causes eye irritation. Skin - Harmful if absorbed through skin. Causes skin irritation. Ingestion - Harmful if swallowed. Inhalation - May be harmful if inhaled. Causes respiratory tract irritation.
GHS
SIGNAL WORD	Danger
PICTOGRAMS
HAZARD STATEMENTS	H302-H313-H318-H402
P STATEMENTS	P280-P305 + P351 + P338
EC DIRECTIVES
HAZARD CODES
RISK PHRASES	22-31-41
SAFETY PHRASES	26-39-46

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