Sodium bisulfite, white crystalline powder. It smells of sulfur dioxide. It has an unpleasant taste. Exposure to the air loses part of the sulfur dioxide, while oxidizing to sulfate. Soluble in 3.5 parts cold water, 2 parts boiling water, about 70 parts ethanol, its aqueous solution is acidic. Melting point decomposition. English alias :Sodium hydrogen sulfite; Sodium Bisulphite; sodium hydrogen sulfate; sodium sulfite.
Sodium metabisulfite is white or yellow crystalline powder or small crystals, with a strong SO2 odor, specific gravity 1.4, soluble in water, aqueous solution is acidic, and strong acid contact releases SO2 and generates the corresponding salts, long in the air, it is oxidized to Na2S2O6, so the product can not last long. Above 150 degrees Celsius, it breaks down SO2.
It is used for trace analysis of tellurium and niobium and preparation of developer, and also used as reducing agent. Used for artificial fiber stabilizer, fabric bleaching agent, photographic developer, dye bleaching deoxidizer, fragrance and dye reducing agent, lignin removal agent for papermaking. Used as a common analytical reagent and photoresistor material. Reductive bleaching agent, which has bleaching effect on food and strong inhibition of oxidase in plant food. Food industry used as bleach, preservative, loosening agent, antioxidant. It is used to make cellulose sulfite ester, sodium thiosulfate, organic chemicals, bleached fabrics, etc., and also used as reducing agent, preservative, dechlorination agent.
Deutschland
United Kingdom
