Research and Application of Thiocyanate-Selective Electrodes Based on Copper (II) Complex with Ethylene-Diamine-Bis-(Salicylaldehyde) Base as Carrier

Abstract:

A new highly selective poly vinyl chloride (PVC) membrane thiocyanate (SCN–) electrode of copper (II) complex with ethylene-diamine-bis-(salicylaldehyde) [Cu (II)-SALEN] base with neutral carrier was studied, it displays a preferential potentiometric response to SCN– . The electrode exhibited near Nernst potential response to SCN– with a concentration range of 1.0×10-1～1.0×10-7 mol/L, a slope of －46 mV/p SCN– and a detection limit of 3.5×10-8 mol/L in pH5.5 of phosphate buffer solution at 25°C. PVC membrane electrode based on Cu (II)-SALEN had good selectivity to SCN– and some common anions had little interference with it. This electrode was applied to the determination of SCN– in waste water and the result obtained were in good agreement with those of high performance liquid chromatography (HPLC) method.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 2230-2233
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.2230
• Online since: November 2011
• Authors: Gang Xu, Wen Li Dong, Ling Yan Ren
• Keywords: Cu (II)-SALEN, Ion-Selective Electrode (ISE), SCN^–, Wastewater

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