N, N-ビス (1-カルボキシアルキル) アルカンジアミンを用いる重金属イオンの溶媒抽出に関する研究

概要

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N, N-Bis (1-carboxyalkyl) alkanediamine (BDAC) was prepared by reaction of methyl ester of 2-bromofatty acid with 1, 2-ethylenediamine or 1, 4-tetramethylenediamine, where fatty acids used are lauric, palmitic, and myristic acids. The pH titration curves of BDAC were measured to determine cationic, zwitter ionic or anionic region of them. BDAC was employed as a chelating agent and heavy metallic ions such as Cu (II), Pb (II), Ca (II), and Cr (VI) were extracted from aqueous solution of pH 212 into isobutyl methyl ketone (IBMK) as BDAC-complex. The effects of pH of the solution, alkyl chain length and methylene numbers of alkanediamine on the extraction were determined by atomic absorption spectrophotometry. BDAC was found to have good chelating propertiy with respect to Cu (II) and Pb (II) in the pH range of 1012.
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