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Cd (II)-selective potentiometric sensor with multilayer solid membrane based on selenide and its applications

O. BIZEREA SPIRIDON1

Affiliation

  1. West University of Timişoara, Faculty of Chemistry-Biology-Geography, Research Center for Thermal Analysis in Environmental Problems, 16 Pestalozzi Street, 300115 Timişoara, Romania

Abstract

The present paper has set itself to develop and characterize a new selenide-based cadmium-sensitive multilayered solid membrane material, with a view to optimizing its composition and improving its electrodic qualities. It has also set itself to achieve a cadmium-selective sensor with the help of this membrane and to determine its functional characteristics. For this, the influence of various factors is studied upon the electrodic function of the sensor, with consequences in the enlargement of the Nernstian response range and implicitly, in lowering the detection limit. Also, the selectivity coefficients are determined by means of the two methods, of separate solutions and of mixed-up solutions, an addition being made to the method of separate solutions, which allows the rapid determination of the selectivity constant. The performance of the proposed sensor is compared to that of the “classical” cadmium sulphide-based electrode and this proving higher qualities particularly regarding the detection limit and selectivity. The electrode was tested on galvanic water and it exhibit suitable characteristics for routine analysis of cadmium in real samples..

Keywords

Ion-selective electrodes (ISE), Ion-selective membrane electrodes (ISME), Cadmium-selective sensors, Solid membrane cadmium-selective sensors, Cadmium selenide.

Submitted at: Oct. 22, 2010
Accepted at: Nov. 19, 2010

Citation

O. BIZEREA SPIRIDON, Cd (II)-selective potentiometric sensor with multilayer solid membrane based on selenide and its applications, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 11, pp. 2226-2235 (2010)