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
收藏
页码：287 / 294
页数：8
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