157953 Sigma-Aldrich

Sodium hydrosulfite

technical grade

Synonym: Sodium dithionite, Sodium hypodisulfite



Related Categories Essential Chemicals, Research Essentials, Salts, Sodium Salts
grade   technical grade
solubility   water: soluble(lit.)


General description

Sodium hydrosulfite (Sodium dithionite, Sodium hypodisulfite, Na2S2O4) is a white crystalline sodium salt. It decomposes in the presence of atmospheric oxygen to afford sodium hydrogen sulfate. It has been prepared by reducing sodium hydrogen sulfite in sulfurous acid solution with zinc. It is widely used for the decolorization prior to dyeing of cloths in the textile industry.


Sodium hydrosulfite may be employed as a reducing agent for the reduction of graphite oxide in a study.
Sodium hydrosulfite has been used as a fluorescent quenching agent in the encapsulation of polynucleotides via production of asymmetric nanoparticles. It has also be used in the form of buffer for the elution of probe labelled proteins involved in the indentification of cellular targets of covalent kinase inhibitors via mass spectrometry method (MS).


2 kg in glass bottle

5, 100 g in glass bottle

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Precautionary statements 
Supplemental Hazard Statements 
Contact with acids liberates toxic gas.
UN 1384 4.2 / PGII
WGK Germany 


Certificate of Analysis


Certificate of Origin


Frequently Asked Questions

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If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
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Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
What is the solubility of Product 157953, Sodium hydrosulfite?
According to The Merck Index, 12th ed., Entry# 8771, this compound is very soluble in water, and only slightly in alcohol.
What other species may be present in Product 157953, Sodium hydrosulfite?
Sigma-Aldrich does not test for the presence or absence of impurities in this product..
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