Membrane-based electrodes for flow-injection determination of noble metal ionsстатья
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Web of Science
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:Two types of polyvinyl chloride (PVC) membrane-based electrodes were prepared and studied under the flow-injection (FI) conditions in order to develop high-performance electrochemical sensors for noble metal ions. The first type of electrodes was similar to a classical PVC-model, whereas in the second, the PVC-matrix was modified by carbon powder and sensor had no internal filling solution. As ion-sensing components (recognition elements), a series of O, N, S containing mono- and dibenzo-crown ethers were tested. The strong dependence of the electrochemical signal to silver(I) ions as well as to acido-complexes of Au(III), Pd(II), Pt(IV) and Ir(IV) on the chemical structure of a membrane-immobilized macrocyclic ligand was found, for both groups of the electrodes. It was clearly shown that the response characteristics of composite membrane-based electrodes (CMEs), having carbon powder within the PVC-matrix, exhibit higher selectivity to noble metal ions than the electrodes of a conventional type. It was also recognized that such electrodes might operate as bifunctional sensors in FI potentiometric/amperometric detection of Au(III) or Ir(IV). The response mechanism of CMEs was discussed and the role of both chemically active agents and carbon species in the forming of resulting signals was clarified.