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Thiocyanate-selective electrode based on N-salicylidene-benzylamineato copper(II) complex

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Abstract

Highly selective poly(vinyl chloride) (PVC) membrane electrode based on N-salicylidene-benzylamineato copper(II) complexes [Cu(SBA)2] as new carriers towards thiocyanate-selective electrode was reported. The influence of membrane composition, pH and possible interfering anions were investigated on the response properties of the electrode. The resulting electrode exhibits anti-Hofmeister selectivity sequence: SCN > ClO 4 > Sal > I > Br > NO 3 > NO 2 > SO 2−3 > H2PO 4 > Cl > SO 2−4 , and a near-Nernstian potential linear range for thiocyanate from 1.0 × 10−1 to 9.0 × 10−7 M with a detection limit of 7.0 10−7 M and a slope of \( - 57.5 mV/pc_{SCN^ - } \), over a wide pH range of 3.0–9.0 in phosphate buffer solution at 20°C. The proposed electrode has a fast response time of about 5–10 s and can be used for at least 3 months without any considerable divergence in potential. The electrode was successfully applied to the determination of thiocyanate in waste water and human urine and saliva samples.

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Correspondence to R. Yuan.

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Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 3, pp. 293–299.

The text was submitted by the authors in English.

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Wang, F.C., Chai, Y.Q. & Yuan, R. Thiocyanate-selective electrode based on N-salicylidene-benzylamineato copper(II) complex. Russ J Electrochem 44, 272–277 (2008). https://doi.org/10.1134/S1023193508030038

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  • DOI: https://doi.org/10.1134/S1023193508030038

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