Usage areas of sodium hydrosulfite
It is also called sodium hydrosulfite, sodium sulfoxylate and sulfoxylate. Sodium dithionite is unstable under physiological conditions, its degradation rate increases with increasing acidity. After contact with moisture, it is oxidized to hydrogen sulfide (hso3-), sulfite (so32-), and hydrogen sulfate (hso4-). It can release sulfur dioxide under strongly acidic conditions. Under anaerobic conditions (as in the lower gastrointestinal tract), hydrogen sulfide (hso3-) and thiosulfate (s2o32-) can occur. Hydrogen sulfide (hso3-) can be absorbed after ingestion. It is metabolized efficiently and most of it is rapidly excreted as sulfate in the urine.
Sodium hydrosulfite is widely used in industry due to its reducing properties and ability to react with oxygen. It is used as a reducing bleaching agent to make yellow discoloration of cellulose-based products in the textile industry, in the pulp and paper industry as a reducing bleach, as an oxygen scavenger in boilers, for preservation and water treatment to remove iron stains on cultural artifacts. Iron flash control on white fabrics in bleaching environments. It is also used in photographic film, clay, wine, leather goods, food and beverages, polymers, cleaners, gas cleaning, environmental remediation, metal recovery and chemical processing.
- In the textile sector, it provides a reductive reaction with the dye remaining on the fiber after dyeing, allowing excess dye to be removed from the fiber.
- It is used in the paper industry for bleaching pulp.
- It is used in the food industry to bleach sherbet and maltose.
- It is used in water conditioning, bleaching minerals by removing iron ions, sulfonation agent and sodium source in the production of chemicals, and purification of gases.