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Sensors 2006, 6(4), 435-444; doi:10.3390/s6040435

Novel Organic Membrane-based Thin-film Microsensors for the Determination of Heavy Metal Cations

1
Hot Laboratory Center, Atomic Energy Authority, 13759 Cairo, Egypt
2
Aachen University of Applied Sciences Jülich Campus, Laboratory for Chemical Sensors and Biosensors, 52428 Jülich, Germany
3
Research Centre Jülich GmbH, Institute of Thin Films and Interfaces (ISG-2), 52425 Jülich, Germany
*
Author to whom correspondence should be addressed.
Received: 5 September 2005 / Accepted: 4 January 2006 / Published: 7 April 2006
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Abstract

A first step towards the fabrication and electrochemical evaluation of thin-filmmicrosensors based on organic PVC membranes for the determination of Hg(II), Cd(II),Pb(II) and Cu(II) ions in solutions has been realised. The membrane-coating mixture used inthe preparation of this new type of microsensors is incorporating PVC as supporting matrix,o-nitrophenyloctylether (o-NPOE) as solvent mediator and a recently synthesizedHg[dimethylglyoxime(phene)]2+ and Bis-(4-hydroxyacetophenone)-ethylenediamine aselectroactive materials for Hg(II) and Cd(II), respectively. A set of three commercialisedionophores for Cd(II), Pb(II) and Cu(II) has been also used for comparison. Thin-filmmicrosensors based on these membranes showed a Nernstian response of slope(26-30 mV/dec.) for the respective tested cations. The potentiometric responsecharacteristics (linear range, pH range, detection limit and response time) are comparablewith those obtained by conventional membranes as well as coated wire electrodes preparedfrom the same membrane. The realisation of the new organic membrane-based thin-filmmicrosensors overcomes the problem of an insufficient selectivity of solid-state-based thin-film sensors.
Keywords: Heavy metal detection; thin-film microsensors; organic PVC membranes; potentiometry. Heavy metal detection; thin-film microsensors; organic PVC membranes; potentiometry.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Arida, H.A.; Kloock, J.P.; Schöning, M.J. Novel Organic Membrane-based Thin-film Microsensors for the Determination of Heavy Metal Cations. Sensors 2006, 6, 435-444.

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