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2D Structure
Also known as: Sodium hydrosulfite, 7775-14-6, Sodium hydrosulphite, Dithionous acid, disodium salt, Sodium sulfoxylate, Disodium dithionite
Molecular Formula
Na2O4S2
Molecular Weight
174.11  g/mol
InChI Key
JVBXVOWTABLYPX-UHFFFAOYSA-L
FDA UNII
2K5B8F6ES1

Dithionite. The dithionous acid ion and its salts.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 InChI
InChI=1S/2Na.H2O4S2/c;;1-5(2)6(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2
2.1.2 InChI Key
JVBXVOWTABLYPX-UHFFFAOYSA-L
2.1.3 Canonical SMILES
[O-]S(=O)S(=O)[O-].[Na+].[Na+]
2.2 Other Identifiers
2.2.1 UNII
2K5B8F6ES1
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Dithionite

2. Dithionite, Sodium

3. Hyposulfite

2.3.2 Depositor-Supplied Synonyms

1. Sodium Hydrosulfite

2. 7775-14-6

3. Sodium Hydrosulphite

4. Dithionous Acid, Disodium Salt

5. Sodium Sulfoxylate

6. Disodium Dithionite

7. Sodium Hypodisulfite

8. Vatrolite

9. 2k5b8f6es1

10. Chebi:66870

11. Blankit

12. Burmol

13. Hydros

14. Sodiumdithionite

15. Blankit In

16. Hydrosulfite R Conc

17. V-brite B

18. Disodium Hydrosulfite

19. Caswell No. 774

20. Ccris 1428

21. Hsdb 746

22. Sodium Hydrosulfite (na2s2o4)

23. Sodium Dithionite (na2(s2o4))

24. Einecs 231-890-0

25. Un1384

26. Epa Pesticide Chemical Code 078202

27. Unii-2k5b8f6es1

28. Sodium Dithionit

29. Sodiumhydrosulfite

30. Sodiumhydrosulphite

31. Sodium Hydro Sulfite

32. Mfcd00011640

33. Sodium Sodium Hydrosulfite

34. Dithionous Aciddisodiumsalt

35. Na2s2o4

36. Ec 231-890-0

37. Sodium Dithionite (na2s2o4)

38. Sodium Dithionite [ii]

39. Sodium Dithionite [mi]

40. Chembl3410462

41. Dtxsid9029697

42. Na2 (s2 O4)

43. Sodium Dithionite [mart.]

44. Sodium Hydrosulfite [hsdb]

45. Sodium Hydrosulfite [inci]

46. Dithionous Acid, Sodium Salt (1:2)

47. Akos015904498

48. Sodium Dithionite Or Sodium Hydrosulfite

49. Bp-13393

50. Ft-0695294

51. S0562

52. Q414560

53. Sodium Dithionite Or Sodium Hydrosulfite [un1384] [spontaneously Combustible]

2.4 Create Date
2005-08-08
3 Chemical and Physical Properties
Molecular Weight 174.11 g/mol
Molecular Formula Na2O4S2
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count6
Rotatable Bond Count0
Exact Mass173.90333939 g/mol
Monoisotopic Mass173.90333939 g/mol
Topological Polar Surface Area119 Ų
Heavy Atom Count8
Formal Charge0
Complexity60.5
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count3
4 Drug and Medication Information
4.1 Therapeutic Uses

Sodium thiosulfate is used in humans to lessen some of the side effects of cisplatin (a cancer medicine). It is also used in the emergency treatment of cyanide poisoning. Sodium thiosulfate is assumed to be intrinsically non-toxic.

OECD; SIDS Initial Assessment Reports for Sodium Dithionite (CAS No.: 7775-14-6) for SIAM 19 (October 2004). Available from, as of November 10, 2009: https://www.inchem.org/documents/sids/sids/7775146.pdf


Sulfites such as sodium pyrosulfite and sodium dithionite, applied topically to the skin of cement workers, appear to be effective in prevention of dermatitis. 9 previously proven chrome sensitive individuals were patch tested with aqueous potassium dichromate 0.5 % mixed with sodium dithionite in the proportion of 3 g/L. Not one patient developed a positive reaction to the chromate mixed with sodium dithionite, though all reacted to 0.5 % chromate in water without sodium dithionite.

European Commission, ESIS; IUCLID Dataset, Sodium dithionite (7775-14-6) (April 2006). Available from, as of November 10, 2009: https://esis.jrc.ec.europa.eu/


4.2 Minimum/Potential Fatal Human Dose

Probable oral lethal dose (human) 0.5-5 g/kg bw.

European Commission, ESIS; IUCLID Dataset, Sodium dithionite (7775-14-6) (April 2006). Available from, as of November 10, 2009: https://esis.jrc.ec.europa.eu/


3. 3= MODERATELY TOXIC: PROBABLE ORAL LETHAL DOSE (HUMAN) 0.5-5 G/KG, BETWEEN 1 OZ & 1 PINT (OR 1 LB) FOR 70 KG PERSON (150 LB). /SULFITES/

Gosselin, R.E., H.C. Hodge, R.P. Smith, and M.N. Gleason. Clinical Toxicology of Commercial Products. 4th ed. Baltimore: Williams and Wilkins, 1976., p. II-85


5 Pharmacology and Biochemistry
5.1 Metabolism/Metabolites

Sodium dithionite is not stable under physiological conditions, with the rate of decomposition increasing with increasing acidity. Upon contact with moisture, it is oxidized to hydrogen sulfite, sulfite and hydrogen sulfate, and under strongly acidic conditions it may liberate sulfur dioxide. Under anaerobic conditions (such as in the lower gastrointestinal tract), hydrogen sulfite and thiosulfate may be formed. Hydrogen sulfite can be absorbed after ingestion. It is efficiently metabolized, and the major part rapidly excreted as sulfate into the urine.

OECD; SIDS Initial Assessment Reports for Sodium Dithionite (CAS No.: 7775-14-6) for SIAM 19 (October 2004). Available from, as of October 19, 2009: https://www.inchem.org/documents/sids/sids/7775146.pdf


As sodium dithionite is chemically unstable in the presence of water and oxygen, in particular under acidic conditions, rapid conversion of sodium dithionite into various related sulfite species is expected to occur under physiological conditions. Therefore, it is justified to take account of toxicological data of sodium sulfite, sodium hydrogen sulfite, and disodium disulfite (= sodium metabisulfite) in the human health assessment of dithionite ... In this context, sodium sulfite and sodium hydrogen sulfite are considered to be the predominant chemicals that are systemically available to the body.

OECD; SIDS Initial Assessment Reports for Sodium Dithionite (CAS No.: 7775-14-6) for SIAM 19 (October 2004). Available from, as of October 19, 2009: https://www.inchem.org/documents/sids/sids/7775146.pdf