SODIUM METABISULFITE

PRODUCT IDENTIFICATION

CAS NO.

7681-57-4

SODIUM METABISULFITE

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