Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2011 Vol: 3 Issue: 4

Investigation of interfering ions effect on a gadolinium(III) PVC membrane sensor

Abstract

A PVC-membrane ion-selective electrode was constructed for quantitative monitoring of gadolinium(III) ion based on 3-methyl-1H-1,2,4-triazole-5-ylhydrosufide (MTY) as an ion carrier. The electrode performance includes a Nernstian slope of 19.8 ± 0.4 mV per decade across a wide concentration range between 1.0 × 10-7 and 1.0 × 10-2 M and a detection limit of 7.3 × 10-8 M. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 66% nitrobenzene (NB), 2% sodium tetraphenyl borate (NaTPB) and 2% MTY. This sensor shows very good selectivity and sensitivity towards gadolinium ion over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor revealed a great enhancement in selectivity coefficients for gadolinium ions, in comparison to the previously reported gadolinium sensors. For testing applicability of the sensor in real sample analysis, it was successfully applied to the F– ions determination in some mouth washing solutions.