期刊
ELECTROANALYSIS
卷 23, 期 1, 页码 287-294出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201000437
关键词
Chromium; Screen-printed electrode; Graphite-epoxy composite; Flow-injection potentiometry; Potentiometry
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.
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