Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 143, Issue 2, Pages 716-723Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.10.022
Keywords
Chromium (VI) sensor; Carbon paste electrode; Graphite-epoxy composite; Composite electrode; Potentiometry
Funding
- Ministerio de Ciencia y Tecnologia [CTQ2005-07788/BQU, CTQ2008-06338/BQU]
- Comunidad Autonoma of Madrid
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Different platforms based on carbon pastes and composite materials, Such as epoxy resin, are used to construct chromium (VI) potentiometric sensors. The materials are modified with diphenylcarbazide as selective agent for chromium (VI) ions. Matrix compositions of each sensor are optimized on the basis of graphite and ionophore amounts. The performance characteristics of all the designed solid-state potentiometric sensors are described. The same linear response range from 1.00 x 10(-6) to 1.00 x 10(-2) mol L-1 and similar detection limits, 6.3 x 10(-7) mol L-1 for graphite-epoxy sensor and 9 x 10(-7) mol L-1 for carbon paste sensor, are obtained. However, the sensor based oil graphite-epoxy materials shows better selective responses and lifetime. Both sensors exhibit high selectivity to hexavalent chromium even in presence of trivalent chromium. The sensors are successfully used in direct potentiometric determinations of hexavalent chromium and are also employed as indicator electrodes in potentiometric titrations with successful results. (C) 2009 Elsevier B.V. All rights reserved.
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