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255556

Sigma-Aldrich

Sodium metabisulfite

ACS reagent, ≥97.0%

Synonyme(s) :

Sodium disulfite, Sodium pyrosulfite

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About This Item

Formule linéaire :
Na2S2O5
Numéro CAS:
7681-57-4
Poids moléculaire :
190.11
Numéro CE :
231-673-0
Numéro MDL:
MFCD00167602
Code UNSPSC :
12352302
ID de substance PubChem :
24855463

Qualité

ACS reagent

Pureté

≥97.0%

Forme

chunks
crystalline powder
powder, crystals or granules

Impuretés

≤0.005% insolubles

pH

4.5 (20 °C, 50 g/L)

Pf

>300 °C (lit.)

Traces d'anions

chloride (Cl-): ≤0.05%
thiosulfate (S2O32-): ≤0.05%

Traces de cations

Fe: ≤0.002%
heavy metals (as Pb): ≤0.001%

Chaîne SMILES 

[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

Clé InChI

HRZFUMHJMZEROT-UHFFFAOYSA-L

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Autres remarques

A -D suffix exists for administrative purposes only.
All -D packages are 100% the same product, same quality, same specification as the package sizes previously sold without a -D.

Pictogrammes

CorrosionExclamation mark
GHS05,GHS07

Mention d'avertissement

Danger

Mentions de danger

H302,H318

Classification des risques

Acute Tox. 4 Oral - Eye Dam. 1

Risques supp

EUH031

Code de la classe de stockage

13 - Non Combustible Solids

Classe de danger pour l'eau (WGK)

WGK 1

Point d'éclair (°F)

Not applicable

Point d'éclair (°C)

Not applicable

Équipement de protection individuelle

dust mask type N95 (US), Eyeshields, Gloves

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Certificats d'analyse (COA)

Lot/Batch Number
BCBJ7031V
BCBJ2453V
MKBL3608V
BCBD1876V
MKBJ7687V

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If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

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Retrouvez la documentation relative aux produits que vous avez récemment achetés dans la Bibliothèque de documents.

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Rosie F Davies et al.
Clinics in dermatology, 29(3), 311-315 (2011-04-19)
Human skin is exposed to a large variety of cosmetic allergens. Most allergic contact dermatitis occurs after exposure to fragrance, preservatives, and hair dyes. Such reactions can often be occult. As a result, a high index of suspicion is needed
Jeffrey N Hemenway et al.
Journal of pharmaceutical sciences, 101(9), 3305-3318 (2012-05-23)
A 2,4-dinitrophenylhydrazine (DNPH) precolumn derivatization high-performance liquid chromatography-ultraviolet detection (HPLC-UV) method was developed to quantify levels of formaldehyde and acetaldehyde in polyethylene glycol (PEG) solutions. Formic acid and acetic acid were quantified by HPLC-UV. Samples of neat and aqueous PEG
I U Nieves et al.
Bioresource technology, 102(13), 6959-6965 (2011-05-03)
Microaeration (injecting air into the headspace) improved the fermentation of hemicellulose hydrolysates obtained from the phosphoric acid pretreatment of sugarcane bagasse at 170°C for 10 min. In addition, with 10% slurries of phosphoric acid pretreated bagasse (180°C, 10 min), air
Ivana Mara da Costa Machado Matos Carvalho et al.
Chemosphere, 82(7), 1056-1061 (2010-11-09)
Sodium metabisulfite is used in marine shrimp harvesting to prevent the occurrence of black spots. Shrimps are soaked in a sodium metabisulfite solution in ice, which is disposed of in sewages that run into marine canals, creating an environmental hazard.
Gisela Palma-Orozco et al.
Phytochemistry, 72(1), 82-88 (2010-11-23)
While a long shelf life for fruit products is highly desired, enzymatic browning is the main cause of quality loss in fruits and is therefore a main problem for the food industry. In this study polyphenol oxidase (PPO), the main
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