What is EDTA and what is its use
Mar 10, 2021
EDTA is a reagent widely used in complexometric titration in analytical chemistry. It is a chelating agent containing carboxyl and amino groups, which can form chelates with many substances to facilitate titration analysis of solution.
In chemical analysis, in addition to complexometric titration, it is also widely used as masking agent in various separation and determination methods. EDTA is often used to form chelates with metal ions, which can be divided into acid form and basic form. It forms colorless chelates with colorless metal ions, and generally forms darker chelates with non-ferrous metal ions.
Application:
1. EDTA is an important complexing agent. EDTA is widely used as bleaching fixer, dyeing aid, fiber treatment aid, cosmetic additive, blood anticoagulant, detergent, stabilizer, polymerization initiator of synthetic rubber, etc. EDTA is the representative of chelating agent. It can form stable water-soluble complexes with alkali metals, rare earth elements and transition metals.
In addition to sodium salts, there are also ammonium salts and various salts such as iron, magnesium, calcium, copper, manganese, zinc, cobalt and aluminum, which have different uses. In addition, EDTA can also be used to rapidly excrete harmful radioactive metals from the human body and play a detoxification role. It's also a water treatment agent. EDTA is also an important indicator, but it is used to titrate metal nickel, copper, etc. when it is used, it should be used together with ammonia to act as an indicator.
2, EDTA is an excellent calcium and magnesium chelating agent. It is used as a chelating agent for emulsion polymerization. It is also used as a complexing agent for anaerobic adhesives, that is, the treatment of EDTA with dimethyl acrylate, removing transition metal ions, eliminating the influence of peroxide decomposition, and improving the stability of anaerobic adhesive.
EDTA sodium salt chelating metal ions can improve the speed of modified acrylic acid. Storage stability of solid structural adhesive (SGA), dosage - 3 × 10-4～6.0 × 10-4。 5%, and the storage stability at 50 ~ C is more than 360h (storage at 50 ℃ for 4D, equivalent to sga20 ~ C storage for 1 year).
