Abstract
ABSTRACT In this work, we introduce a highly selective and sensitive silver(I) PVC-membrane sensor. Dilaktam Crown ether (DLCE) was used as a membrane-active component to prepare a highly sensitive Ag(I)-selective polymeric membrane electrode. This sensor illustrated very good selectivity and sensitivity towards silver ions over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor exhibited a Nernstian behavior (with a slope of 59.8 ± 0.2 mV per decade) for a concentration range (1.0 × 10 -5__ 1 . 0 × 10 -1 M) with a detection limit of 6.8×10 -6 M. It displayed a response time in the whole concentration range ( ~ 20 s) and its usage exceeded a 75 days period in the pH range of 5.1–7.2. The proposed electrode application was found to be successful as an indicator electrode in the titration with NaCl. Keywords: Dilaktam Crown ether, Silver, sensor, PVC Membrane, Ion-selective electrode, Potentiometry email address: haszamani@yahoo.com INTRODUCTION
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