Product
Sodium Bisulphite
Sodium Bisulphite is a reducing agent used to remove chlorine ahead of RO membranes, scavenge oxygen in boiler water and reduce chromium in plating effluent.
- Grades / forms
- Technical
Overview
Sodium bisulphite (NaHSO₃) reacts rapidly with oxidising agents. Its biggest use in water treatment is dechlorination: free chlorine that protects pipework from bacteria will destroy polyamide reverse osmosis membranes, so bisulphite is dosed just ahead of the RO unit to neutralise it. The same reaction is used to dechlorinate effluent before discharge to rivers.
In industry it reduces toxic hexavalent chromium to trivalent chromium in plating and tannery effluent, scavenges dissolved oxygen from boiler feed water and acts as an antichlor after textile bleaching. It is supplied as a solution or prepared on site from sodium metabisulphite powder, which dissolves to give the same active species.
Applications
- 1Dechlorination of RO and nanofiltration feed water
- 2Dechlorination of effluent before discharge
- 3Oxygen scavenging in boiler feed water
- 4Hexavalent chromium reduction in plating effluent
- 5Antichlor after textile bleaching
Packing & storage
Packing
- 25 kg PE-lined bags (powder)
- 250 kg HDPE drums (solution)
- 1000 L IBCs (solution)
Storage & handling
Keep containers closed — bisulphite slowly oxidises to sulphate in air and loses strength. Contact with acids releases sulphur dioxide gas.
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Request a quotation or call +91 97979 77958- Certificate of Analysis with every batch
- SDS in destination format
- Made to your specification
- Private label packing
Questions
Sodium Bisulphite, answered.
In theory about 1.5 mg of sodium bisulphite neutralises 1 mg of free chlorine. In practice RO plants dose around 2–3 mg per mg of chlorine to allow for dissolved oxygen and to keep a small safety margin, confirmed by an ORP or residual chlorine check.
Sodium metabisulphite (Na₂S₂O₅) is a stable dry powder. When dissolved in water it forms sodium bisulphite, so both deliver the same active chemistry. Powder metabisulphite is cheaper to ship; bisulphite solution is easier to dose.
Yes. At a pH of about 2 to 3, sodium bisulphite reduces toxic hexavalent chromium to trivalent chromium, which is then precipitated as chromium hydroxide by raising the pH.
Yes. Cosmo Chemistry manufactures and exports Sodium Bisulphite from Surat, Gujarat, India to more than 55 countries, for customers in the water treatment industry. Send your grade, quantity and destination port for a quotation within one business day.
Every shipment of Sodium Bisulphite from Cosmo Chemistry includes a batch-specific Certificate of Analysis (COA) and Safety Data Sheet (SDS). Certificate of Origin, third-party pre-shipment inspection and destination-specific regulatory documentation are arranged on request.
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