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

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Original Articles: 2011 Vol: 3 Issue: 4

Synthesis of thio schiff-base as sensing material for fabrication of Tm3+-PVC membrane sensor

Abstract

The Thio Schiff-Base (TSB) was used as an excellent ionophore in the construction of a Tm3+ PVC-based membrane sensor. The constructed PVC membrane sensor containing TSB exhibits a Nernstian response of 20.1 ± 0.3 mV per decade for Tm3+ ions over a wide concentration range between 1.0×10-7 and 1×10-2 M, with a limit of detection of 8.6 ×10-8 M. It has a fast response time (<10 s), operates well in the pH range of 3.0–8.7. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 55% o-nitrophenyloctyl ether (NPOE), 4% TSB, 10% oleic acid (OA) and 1% sodium tetraphenyl borate (NaTBP).

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