Complexes of Divalent Metal Ions with Dibasic Organic Acids in Aqueous, Ethanol-Water and Acetone-Water Solutions

Abstract

2가유기산(말론산, 타르타르산, 프탈산, 숙신산)용액에서 방사성 동위원소 구리 및 카드뮴 이온이 양이온 교환수지와 용액사이에 어떻게 분배되는가를 실온에서 조사하여 유기산과의 착물형성에 관한 연구를 하였다.

용매로는 물, 에탄올-물(20%)과 아세톤-물(20%)을 사용하였고 용액의 pH는 7.0-7.5 그리고 이온강도는 0.10으로 고정하였다. 연구결과 금속이온들은 유기산과 1:1 착물을 형성하였고 착물의 안정도는 다음 순으로 증가하였다. (1) Cd??

Solutions of Cu?? and Cd?? were mixed with the solutions of various dibasic organic acids in the presence of cation exchange resin at room temperature. The distribution ratios of the metal ions between resin and solution were measured, using radioactive metal ions as tracer. From the observed variation of the distribution ratios with acid anion concentrations, it was concluded that Cu?? and Cd?? formed one-to-one complexes with succinate, malonate, o-phthalate and tartarate ions in aqueous, 20% ethanol-water and 20% acetone-water solutions. The results of the present study indicated that the relative stabilities of the complexes in solution increased generally in the order : Cu??>Cd?? complexes. Succinate

Solutions of Cu?? and Cd?? were mixed with the solutions of various dibasic organic acids in the presence of cation exchange resin at room temperature. The distribution ratios of the metal ions between resin and solution were measured, using radioactive metal ions as tracer. From the observed variation of the distribution ratios with acid anion concentrations, it was concluded that Cu?? and Cd?? formed one-to-one complexes with succinate, malonate, o-phthalate and tartarate ions in aqueous, 20% ethanol-water and 20% acetone-water solutions. The results of the present study indicated that the relative stabilities of the complexes in solution increased generally in the order : Cu??>Cd?? complexes. Succinate