Application of a carbon paste electrode modified with a Schiff base ligand to mercury speciation in water

被引：24
作者：
Colilla, M
Mendiola, MA
Procopio, JR
Sevilla, MT [1 ]
机构：
[1] Univ Autonoma Madrid, Dept Quim Analit & Anal Instrumental, E-28049 Madrid, Spain
[2] Univ Autonoma Madrid, Dept Quim Inorgan, E-28049 Madrid, Spain
来源：
ELECTROANALYSIS | 2005年 / 17卷 / 11期
关键词：
mercury; river water; CPE modified with Schiff base ligand; cyclic voltammetry; square-wave voltammetry;
D O I：
10.1002/elan.200403198
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A carbon paste electrode, modified with benzylbisthiosemicarbazone is used for mercury speciation in water samples. Mercury ion is selectively accumulated on the electrode surface at open circuit and its analysis was performed by cyclic voltammetry or square-wave voltammetry (SWV). A detection limit of 8 mu g L-1 (3 sigma) was found for 15 min of accumulation using SWV as measurement technique. The effect of several metallic ions and organic substances on voltammetric signal is examined. For speciation purposes, a ligand competition methodology between ligands in solution and electrode is used. Model mercury complexes are characterized as a function of their dissociation kinetics. The method was applied to mercury speciation in water samples from the Jarama River in Madrid.
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收藏
页码：933 / 940
页数：8
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