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Chelation is useful in applications such as providing nutritional supplements, in chelation therapy to remove toxic metals from the body, as contrast agents in MRI scanning, in manufacturing using homogeneous catalysts, in chemical water treatment to assist in the removal of metals, and in fertilizers.
DOTA is derived from the macrocycle known as cyclen.The four secondary amine groups are modified by replacement of the N-H centers with N-CH 2 CO 2 H groups. The resulting aminopolycarboxylic acid, upon ionization of the carboxylic acid groups, is a high affinity chelating agent for di- and trivalent cations.
Chelating agents, natural zeolite, activated carbon, resins, and liquid organics impregnated with chelating agents are all used to exchange cations or anions with the solution. [ citation needed ] Selectivity and recovery are a function of the reagents used and the contaminants present.
A low by-product synthesis route for trisodium N-(1-carboxylatoethyl)iminodiacetate has recently been described, in which alanine is ethoxylated with ethylene oxide in an autoclave to form bis-hydroxyethylaminoalanine and then oxidized to α-ADA at 190 °C with Raney copper under pressure. [6] The yields are over 90% d.Th., the NTA contents ...
Its conjugate base nitrilotriacetate is used as a chelating agent for Ca 2+, Co 2+, Cu 2 ... and As from wood that had been treated with chromated copper arsenate. [9 ...
A colorless solid, its conjugate base is a chelating agent, which is used for the quantitative determination of metal ions. In aqueous solution 8-hydroxyquinoline has a pK a value of ca. 9.9 [1] It reacts with metal ions, losing the proton and forming 8-hydroxyquinolinato-chelate complexes. Tris(8-hydroxyquinolinato)aluminium [2]
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