It is used as complexing agent, pharmaceutical, color development, rare metal smelting, chelating agent, etc; preservative; Antioxidant synergist; Processing aids. Uses: It is used as oxygen carboxyl complexing agent, as ammonia carboxyl complexing agent in pharmaceutical industry, as well as in pharmaceutical industry and color development. It has antioxidant effect and strong chelating effect on metal ions as a stabilizer. Our country stipulates that it can be used for pickles and cans, and the maximum use amount is 0.25g/kg. Among the salts of EDTA, disodium salt is the most important, which is an important complexing agent for complexing metal ions and separating metals. It can also be used in detergents, liquid soaps, shampoo, agricultural chemical sprays, bleaching fixatives for color sensitive material processing, water purification agents, pH regulators, anionic coagulants, etc. In the redox initiation system for styrene butadiene rubber polymerization, disodium EDTA, as a component of the active agent, is mainly used to complexe ferrous ions and control the polymerization rate. This product is low toxic. The oral LD50 of rats is 2000 mg/kg. It is mainly used in adhesives, filament winding, laminates, high-performance coatings and tank lining coatings, as curing agent of epoxy resin and chain extender of polyurethane monomers, and as quantitative analysis agent of heavy metals; It is used for complexing iron ions, controlling polymerization reaction speed, as complexing agent, calcium, magnesium and other metal reagents, and metal masking agent. Disodium ethylenediaminetetraacetate is an important complexing agent for complexing metal ions and separating metals.