A novel PVC membrane sensor for potentiometric determination of thallium(I)

摘要

Several thallium(I) ion-selective electrodes based on quinoline-carbonitrile compounds as a novel class of sensors have been prepared and studied. The optimum thallium(I) ion-selective electrode is made from 2-cyclohexylthio-4-oxo-1(4H)quinoline-3-carbonitrile as the electroactive material. This electrode exhibits a Nernstian response for 0.1-1.0 * 10~(-5) M TlNO_3 with a slope of 56 mV decade~(-1). The detection limit is 3.2 * 10~(-6) M. The electrode shows a high selectivity, stability and reproducibility and can be used as a sensor in potentiometry.