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纸电泳法测定铜（II）和钴（II）与次氮基三乙酸和半胱氨酸的二元及三元配合物的稳定常数

Paper electrophoretic determination of the stability constants of binary and ternary complexes of copper(II) and cobalt(II) with nitrilotriacetate and cysteine.

作者信息

Tewari Brij Bhushan

机构信息

Department of Chemistry, Faculty of Natural Science, University of Guyana, P.O. Box 101110, Georgetown, Guyana.

出版信息

J Chromatogr A. 2006 Jan 20;1103(1):139-44. doi: 10.1016/j.chroma.2005.11.002. Epub 2005 Dec 7.

DOI:10.1016/j.chroma.2005.11.002
PMID:16337637
Abstract

A paper ionophoretic method is described for the study of equilibria in mixed ligand (nitrilotriacetate-cysteine) complex system in solution. The proportion of ionic species of nitrilotriacetate (NTA) and cysteine were varied by changing the pH of background electrolyte. The stability constants of Cu(II)-NTA-cysteine and Co(II)-NTA-cysteine complexes were found to be 6.35+/-0.05 and 5.45+/-0.02 (logarithm stability constant values), respectively, at ionic strength 0.1 M and a temperature of 35 degrees C.

摘要

本文描述了一种纸电泳法，用于研究溶液中混合配体（次氮基三乙酸 - 半胱氨酸）络合物体系的平衡。通过改变背景电解质的pH值来改变次氮基三乙酸（NTA）和半胱氨酸的离子种类比例。在离子强度为0.1 M、温度为35摄氏度的条件下，发现Cu(II)-NTA-半胱氨酸和Co(II)-NTA-半胱氨酸络合物的稳定常数分别为6.35±0.05和5.45±0.02（对数稳定常数）。

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