Potentiometric Screen-Printed Bisensor for Simultaneous Determination of Chromium(III) and Chromium(VI)

被引：15

作者：

Sanchez-Moreno, Raul A. ^{[1
]}

Jesus Gismera, Ma ^{[1
]}

Teresa Sevilla, Ma ^{[1
]}

Procopio, Jesus R. ^{[1
]}

机构：

[1] Univ Autonoma Madrid, Fac Ciencias, Dept Quim Analit & Anal Instrumental, E-28049 Madrid, Spain

来源：

ELECTROANALYSIS | 2011年 / 23卷 / 01期

关键词：

Chromium; Screen-printed electrode; Graphite-epoxy composite; Flow-injection potentiometry; Potentiometry; SIMULTANEOUS QUANTIFICATION; MEMBRANE SENSORS; ELECTRODES; SPECIATION; BATCH;

D O I：

10.1002/elan.201000437

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A disposable dual screen-printed electrode was designed and evaluated for the direct and simultaneous determination of chromium(VI) and chromium(III) in batch and flow analysis. For this purpose a carbon screen-printed bielectrode was modified with a graphite-epoxy composite which contains diphenylcarbazide and another graphiteepoxy composite prepared with di(2-hydroxyphenylimino) ethane. The principal analytical parameters of the potentiometric responses in batch and flow analysis were optimized and calculated. The bisensor shows optimal detection limits of 7.7 x 10(-7) M and 7.9 x 10(-6) M in static mode, and 9.0 x 10(-7) M and 1.2 x 10(-5) M in flow analysis for hexavalent and trivalent chromium, respectively. This potentiometric device was employed with successful results to determine both chromium species in leachates from municipal solid waste landfills.

引用

页码：287 / 294

页数：8

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