Sodium citrate: widely used in food, beverage, spice industry as acidulant, flavoring agent and preservative, preservative, buffering agent, chelating agent. It is used as antioxidant, plasticizer and detergent in chemical industry, cosmetic industry and washing industry. Anti-coagulant in pharmaceutical industry. Chemical, leather, printing, non-toxic plating and atomic energy industries.

Sodium sulfite: printing and dyeing industry as a deoxidizer and bleaching agent, used in a variety of cotton fabric cooking, can prevent the cotton fiber local oxidation and affect the strength of the fiber, and can improve the whiteness of the cooking material. It is used as developer in photographic industry. Organic industry as a reducing agent for the production of m-phenylenediamine, sodium nitrogen salicylate, etc. to prevent the oxidation of semi-finished products in the reaction process. Used as a reducing agent for dehydrated vegetables in the food industry to prevent the green pigment in vegetables from deteriorating and yellowing. Used as a reducing agent for the production of cuprous cyanide in inorganic industry. It is used in water treatment to treat boiler water.

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