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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 24, Number 2
JKCSEZ 24(2)
April 20, 1980 

The Cation Exchange Separation of Metal-Trien Mixed Complexes

금속-Trien 혼합착물의 양이온 교환수지상에서의 분리
Yung-Kyu, Park, Chul-Heui Lee, Mu-Kang Lee

박영규, 이철희, 이무강
금속 CdⅡ), Cu(Ⅱ) 및 Pb(Ⅱ)의 Trien-OH 계에서 ion강도 0.1, 25℃±1일때 혼합착물에 대한 안정도정수를 폴라그래프에 의해 구하였으며, 이들 혼합착물의 pH변화에 따른 분포상태를 컴퓨터로 계산하여 검토하였다. 또한 Cu(Ⅱ)와 Cd(Ⅱ)를 분리하기 위해 양ion 교환수지상에서의 조건분배계수이 이론식을 안정도정수를 이용하여 유도하였으며, pH변화에 따른 Cu(Ⅱ)와 Cd(Ⅱ)의 분리최적조건은 pH 9.0이상임을 알았다. EDTA를 가리움제로 하여 Cd(Ⅱ)-Cu(Ⅱ)-Trien-EDTA계에서 실험조건을 pH 11.0로 하고 Cu(Ⅱ)를 Cd(Ⅱ)로부터 분리한 결과는 만족할만 하였으며 이론치와 잘 일치하였다.

The formation constants of the mixed-ligand complexes in the Cd(Ⅱ), Cu(Ⅱ) and Pb(Ⅱ)-Trien-OH system were studied by polarograph. The formation constant (logβij) was determined at 25℃ in the ionic strength of 0.1. It was also confirmed that the mixed ligand complexes in this system were formed above pH 10.2, 10.5 and 9.0 for Cu(Ⅱ), Cd(Ⅱ) and Pb(Ⅱ) by the calculation of the distribution for complexes at the various pH. Masking of Cd(Ⅱ) by conversion to anionic EDTA-complexes has been used to separate Cu(Ⅱ) from Cd(Ⅱ) through passage of a combined Trien-EDTA solution on an cationic resin column. The optimal condition for the separation of Cu(Ⅱ) from Cd(Ⅱ) is confirmed at the pH range above 9.0, not only by considering the theoretical equation of the conditional-exchange-constant of metal on the cation exchange resin,but also by calculating the distribution of the mixed ligand complexes in the resin at the various pH with computer. By analyzing the synthetic sample of Cu(Ⅱ) and Cd(Ⅱ) with a EDTA masking at pH 9.5, it is found that the results of the experiment are satisfied with the theoretical value.

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