Here are several common chelating agents:
Amino Acids: Amino acids used as chelating agents are ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (also known as sub-nitrilotriacetic acid NTA), 2 ethylene triamine pentaacetic acid and salt. Their calcium and magnesium ions have a strong sequestration. From unit mass of the three the number of acid chelated calcium look to NTA chelating up, ZDTA Secondly, DTPA again. From a practical point of view) NTA chelate with calcium ions forming very stable and the price is cheap, so often do in the detergent substitute for sodium tripolyphosphate.
Polycarboxylic acid: a polyacrylic acid, methyl methacrylate, HPMA, fumaric acid (fumaric acid) - acrylic acid copolymer. They contain anionic polymerization of metal ions are good chelating agents, therefore, be used as inhibitors. Polyacrylic acid and its sodium salt which is the most widely used application of polycarboxylic acid type inhibitors.
Hydroxy Acids: chelating agents such as citric acid is mainly (CA), tartaric acid (TA) and the sour grapes Yiu I (GA). Since these chelating agents in the integration of performance under the conditions of weak acid, commonly used in detergent formulations for their Lan detergent. In which sodium gluconate chelating agent is a good all-round, on a variety of chelated metal ions can have a good split and sodium tartrate, sodium citrate can chelate most of the divalent and trivalent metal ions.
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