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13459

Sigma-Aldrich

Sodium metabisulfite

puriss., meets analytical specification of Ph. Eur., BP, NF, FCC, E223, dry, 97-100.5%

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Synonym(s):
Sodium disulfite, Sodium pyrosulfite
Linear Formula:
Na2S2O5
CAS Number:
Molecular Weight:
190.11
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

puriss.

Quality Level

assay

97-100.5%

form

powder or crystals

quality

dry
meets analytical specification of Ph. Eur., BP, NF, FCC, E223

composition

SO2, 65.0-67.4%

impurities

residue of solvents, complies
≤0.02% thiosulfate (S2O3)

pH

3.5-5.0 (20 °C, 5%)

mp

>300 °C (lit.)

anion traces

chloride (Cl-): ≤100 mg/kg

cation traces

As: ≤2 mg/kg
Cu: ≤10 mg/kg
Fe: ≤10 mg/kg
Hg: ≤1 mg/kg
Pb: ≤2 mg/kg
Se: ≤5 mg/kg
Zn: ≤10 mg/kg

suitability

complies for appearance of solution

SMILES string

[Na+].[Na+].[O-]S(=O)S([O-])(=O)=O

InChI

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

InChI key

HRZFUMHJMZEROT-UHFFFAOYSA-L

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1 of 4

This Item
31448PHR1434S9000
Sodium metabisulfite puriss., meets analytical specification of Ph. Eur., BP, NF, FCC, E223, dry, 97-100.5%

13459

Sodium metabisulfite

Essential Grade
Sodium metabisulfite puriss. p.a., ACS reagent, reag. Ph. Eur., dry, 98-100.5%

31448

Sodium metabisulfite

Essential Grade
Sodium Metabisulfite Pharmaceutical Secondary Standard; Certified Reference Material

PHR1434

Sodium Metabisulfite

-
Sodium metabisulfite ReagentPlus®, ≥99%

S9000

Sodium metabisulfite

-
assay

97-100.5%

assay

98-100.5%

assay

-

assay

≥99%

grade

puriss.

grade

-

grade

-

grade

-

anion traces

chloride (Cl-): ≤100 mg/kg

anion traces

chloride (Cl-): ≤50 mg/kg

anion traces

-

anion traces

-

impurities

residue of solvents, complies, ≤0.02% thiosulfate (S2O3)

impurities

≤0.01% thiosulfate (S2O3)

impurities

-

impurities

-

mp

>300 °C (lit.)

mp

>300 °C (lit.)

mp

>300 °C (lit.)

mp

>300 °C (lit.)

General description

Sodium metabisulfite (MBS, Sodium disulfite) is an inorganic salt. It is the sodium salt of disulphurous (pyrosulfurous) acid. It is widely used as reducing agent in textile and photography industry. It is commonly added to various foods and wines as preservative.

Application

Sodium metabisulfite was used to initiate the cross-linking of polybutadiene in the cores of the vesicle membranes by free radical polymerization in solution. It has been used to prevent the oxidation (as antioxidant) during the preparation of stock solutions of 6-hydroxydopamine in various studies.

pictograms

CorrosionExclamation mark

signalword

Danger

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1

supp_hazards

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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Eagleson M.
Concise Encyclopedia Chemistry, 337-337 (1994)
W Wright et al.
The American review of respiratory disease, 141(6), 1400-1404 (1990-06-01)
Sodium metabisulfite (MBS) is used as a preservative in food and wine and frequently triggers attacks of asthma. To determine the characteristics of responses to inhaled MBS, 30 asthmatic subjects and 16 nonasthmatic subjects inhaled MBS, in concentrations of 6.2
Johanne Louise Neiiendam et al.
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