1. It is used for the microanalysis and determination of tellurium and niobium and the preparation of developer, and is also used as a reducing agent;
2, used for artificial fiber stabilizer, fabric bleach, photographic developer, dye bleaching deoxidizer, perfume and dye reducing agent, paper lignin removal agent, etc;
3, used as common analytical reagents and photosensitive resistance materials;
4, reducing bleach, bleaching effect on food and have a strong inhibitory effect on oxidase in plant foods. Our country stipulates that it can be used for candied fruit with a maximum usage of 2.0 g/kg. It can also be used for glucose, liquid glucose, sugar, crystal sugar, maltose, candy, bamboo shoots, mushrooms and canned mushrooms, grapes and blackcurrant concentrated juice, with a maximum usage of 0.60 g/kg. The residue (calculated as SO2) of bamboo shoots, mushrooms and canned mushrooms, candied fruits, grapes and blackcurrant juice concentrate shall be ≤ 0.05 g/kg; the residue of potato starch shall be ≤ 0.03 g/kg; the residue of biscuits, sugar, vermicelli and other varieties shall be less than 0.1 g/kg; the residue of liquid glucose shall not exceed 0.2 g/kg;
5. Printing and dyeing industry as a deoxidizer and bleaching agent, used for all kinds of cotton fabric cooking, can prevent the local oxidation of cotton fiber and affect the fiber strength, and improve the whiteness of the cooking material. The photosensitive industry is used as a developer. The organic industry is used as a reducing agent for the production of m-phenylenediamine, 2,5-dichloropyrazolone, anthraquinone -1-sulfonic acid, 1-aminoanthraquinone, sodium aminosalicylate, etc., to prevent the oxidation of semi-finished products during the reaction. The paper industry is used as a lignin removal agent. The textile industry is used as a stabilizer for man-made fibers. The electronics industry is used to manufacture photoresistors. Water treatment industry for electroplating wastewater, drinking water treatment;
6. The food industry is used as a bleaching agent, preservative, bulking agent, antioxidant. Also used in pharmaceutical synthesis, production of dehydrated vegetables used as a reducing agent;
7. Used for the preparation of sulfite cellulose ester, sodium thiosulfate, organic chemicals, bleaching fabrics, etc., also used as reducing agent, preservative, dechlorination agent, etc;
8. Laboratory for the preparation of sulfur dioxide.