Abstract
A novel selective thiocyanate PVC membrane electrode based on bis-bebzoin-semitriethylenetetraamine binuclear copper(II) [Cu(II) 2–BBSTA] as neutral carrier is reported, which displays an anti-Hofmeister selectivity sequence in following order: SCN − > ClO 4 − > I − >Sal − >SO 3 2− >NO 3 − > H 2PO 4 − > Cl − >NO 2 − > SO 4 2−. The electrode exhibits Nernstian potential linear range to thiocyanate from 1.0 × 10 −1 to 9.0 × 10 −7 mol/l with a detection limit 7.0 × 10 −7 mol/l and a slope of −57.0 mV/decade in pH 5.0 of phosphorate buffer solution at 25 °C. The response mechanism is discussed in view of the AC impedance technique and the UV spectroscopy technique. From comparison of potentiometric response characteristics between the binuclear metallic complex copper(II) [Cu(II) 2–BBSTA] and mononuclear copper(II) metallic complex [Cu(II)–BBSDA], an enhanced response towards thiocyanate from the electrode based on binuclear metallic complex copper (II) [Cu(II) 2–BBSTA] was observed. The electrode based on binuclear copper(II) compound was used to determine the thiocyanate content in waste water with satisfactory results.
Published Version
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