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31448

Sigma-Aldrich

Sodium metabisulfite

puriss. p.a., ACS reagent, reag. Ph. Eur., dry, 98-100.5%

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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:
NB.24

grade

ACS reagent
puriss. p.a.

Quality Level

agency

reag. Ph. Eur.

assay

98-100.5%

form

powder

quality

dry

impurities

≤0.01% thiosulfate (S2O3)

pH

3.5-5.0 (20 °C, 5%)

mp

>300 °C (lit.)

anion traces

chloride (Cl-): ≤50 mg/kg

cation traces

As: ≤0.5 mg/kg
Ca: ≤50 mg/kg
Cd: ≤50 mg/kg
Co: ≤50 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤100 mg/kg
Ni: ≤50 mg/kg
Pb: ≤5 mg/kg
Zn: ≤10 mg/kg

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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This Item
13459PHR1434161519
Sodium metabisulfite puriss. p.a., ACS reagent, reag. Ph. Eur., dry, 98-100.5%

31448

Sodium metabisulfite

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

13459

Sodium metabisulfite

Essential Grade
Sodium Metabisulfite Pharmaceutical Secondary Standard; Certified Reference Material

PHR1434

Sodium Metabisulfite

-
Sodium metabisulfite reagent grade, 97%

161519

Sodium metabisulfite

-
assay

98-100.5%

assay

97-100.5%

assay

-

assay

97%

Quality Level

200

Quality Level

200

Quality Level

300

Quality Level

100

grade

ACS reagent, puriss. p.a.

grade

-

grade

certified reference material, pharmaceutical secondary standard

grade

reagent grade

mp

>300 °C (lit.)

mp

>300 °C (lit.)

mp

>300 °C (lit.)

mp

>300 °C (lit.)

pH

3.5-5.0 (20 °C, 5%)

pH

3.5-5.0 (20 °C, 5%)

pH

-

pH

4.5 (20 °C, 50 g/L)

General description

Sodium metabisulfite (MBS, Sodium disulfite) is an inorganic salt. It is the sodium salt of disulphurous (pyrosulfurous) acid. It is widely used in textile dyeing, photography and paper industry. It is also commonly added to various food products and wines as a preservative.

Application

Sodium metabisulfite may be used as an initiator during the cross-linking polymerization of polybutadiene in the cores of the vesicle membranes. It may be added as an 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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