Determination of Thiocyanate Ion by Ion-selective Electrode Using Schiff Base Complex of Cu(II) as an Ionophore

This study is related with the determination of thiocyanate anion by using 3,12- diaza-4,5,10,11-dibenzo-16-methyl-6,9-dioxaheptadec-1(17),14,15-triene-2,13 diimenecopper(II) as ionophore. The membrane sensor with composition of 37% PVC, 60%, BES, 2% HTBP and 1% ionophore, exhibits a Nernstian response for thiocyanate ion, with a wide concentration range of 4.4×10?8?1.0×10?1 M, low detection limit (1.0×10?8 M) and slope of 60.5.±0.3 mV decade?1 of activity within pH range of 2.5–8.5 and fast response time of 5s. The sensor was also found to work satisfactorily in partially non-aqueous media up to 30% (v/v) content of methanol, ethanol or acetone and could be used for a period of 2 months without any change in response characteristics.