Voltammetry of sparingly soluble metal complexes:: a differential pulse polarographic study of the Zn(II) plus oxalate system

被引:15
作者
Berbel, F [1 ]
Díaz-Cruz, JM [1 ]
Ariño, C [1 ]
Esteban, M [1 ]
机构
[1] Univ Barcelona, Fac Quim, Dept Quim Analit, E-08028 Barcelona, Spain
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1999年 / 475卷 / 02期
关键词
voltammetry; Zn(II) plus oxalate system; pulse polarography;
D O I
10.1016/S0022-0728(99)00331-9
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
An extension of a voltammetric model for the complexation between metal ions and mixtures of ligands (either simple or macromolecular, labile or inert) is proposed for the study of the Zn(II)+ oxalate system. The model considers the presence of species of low solubility that can be assumed to behave as soluble inert complexes. As well as the solubility problem, a loss of reversibility in the zinc reduction process occurs. This problem is overcome by increasing the effective time scale of the measurements. The application of the model to experimental data has produced reliable results, which can be used to estimate complexation constants and solubility products, as long as the irreversible processes that influence the current and potential measurement are avoided. (C) 1999 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:99 / 106
页数:8
相关论文
共 38 条
[1]   Voltammetry of metal ions in mixtures of ligands - Part III: Application to systems including inert complexes [J].
Berbel, F ;
Diaz-Cruz, JM ;
Arino, C ;
Esteban, M .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1998, 453 (1-2) :151-159
[2]   Voltammetry of metal ions in mixtures of ligands .2. Application to successive labile complexes [J].
Berbel, F ;
DiazCruz, JM ;
Arino, C ;
Esteban, M .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1997, 432 (1-2) :243-251
[3]   Voltammetry of metal ions in mixtures of ligands .1. Theoretical formulation and application to 1:1 labile complexes [J].
Berbel, F ;
DiazCruz, JM ;
Arino, C ;
Esteban, M .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1997, 431 (01) :99-110
[4]  
Berbel F, 1998, ELECTROANAL, V10, P417
[5]  
Bond A.M., 1980, MODERN POLAROGRAPHIC
[7]   USE OF ION-SELECTIVE ELECTRODES IN EVALUATION OF STABILITY CONSTANTS OF SPARINGLY SOLUBLE SALTS - APPLICATION TO LEAD(II)-FLUORIDE SYSTEM IN AQUEOUS SOLUTION [J].
BOND, AM ;
HEFTER, G .
INORGANIC CHEMISTRY, 1970, 9 (05) :1021-&
[8]  
BOND AM, 1972, J ELECTROANAL CHEM, V34, P227, DOI 10.1016/S0022-0728(72)80518-7
[9]  
BUFFLE J, 1989, COMPLEXATION REACTIO
[10]  
CHRISTIE JH, 1966, ELECTROCHIM ACTA, V11, P1525