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Sodium Bisulphite Solution

Sodium Bisulphite Solution


Name : Sodium Bisulphite Solution

Grade : Food

Description : Clear, colorless to yellowish solution containing 36 – 38 % Sodium Bisulphite (NaHSO3) or 37.5 - 40.5 % sodium bisulfite (NaHSO3) or approx. 23 – 24 % sulphur dioxide (SO2). Odour of SO2.


Chemical name : Sodium bisulfite (or sodium hydrogen sulfite) aqueous solution

Chemical formula : NaHSO 3

Molar mass : 104.06 g/mol

CAS-No. : 7631-90-5

EINECS-No. : 231-548-0

Properties : Solution is acidic and oxidizes when contacting air.


Sodium Bisulphite (NaHSO3) : % WT 36 – 38

Sulfur Dioxide (SO2) : % WT 22.9 – 24.2

Iron (as Fe) : 20 pmMax.

Density : Kg/L 1.3 – 1.4

pH : 4.0 – 5.0

The product is tested using our standard analytical methods.


  • Food: Preserving foodstuffs, aid with the production of starch, for ensiling green fodder.
  • Treatment of process water: Removal of excess chlorine, in special cases removal of oxygen
  • Treatment of waste water: e.g. removal of excess chlorine in the neutralization of cyanide, neutralization of chromic acid.
  • Chemical and pharmaceutical industry: As reducing agent, for purifying and isolating aldehydes and ketones.Destroying waste bromine.
  • Textile industry: Cleaning bleaching wool, jute and other vegetable fibres. For reduction in the dye works.
  • Leather industry: Solubilizing tanning extracts.
  • Paper and pulp industry: Bleaching ground wood.
  • Photographic and film industry: For developer solutions, for acidifying fixing baths.


Solution undergoes oxidation on standing in air and should be used up within a short time. At temperatures below 10 °C Sodium Metabisulphite may crystallize.


Harmful if swallowed. Contact with acids liberates toxic sulfur dioxide gas. Causes strong oxygen consumption in the water course; may harm aquatic organisms