Studies on Highly Selective Thiocyanate Electrode Based on Bisbebzoin-semi-triethylenetetraamine Binuclear Cobalt Complex as Neutral Carriers

Abstract

Abstract: A new highly selective thiocyanate PVC membrane electrode based on bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ) metallic complex [Co(Ⅱ)₂-BBSTA] as neutral carrier is reported, which displays an anti-Hofmeister selectivity sequence. The electrode exhibits Nernstian potential linear range to thiocyanate from 1.0×10^-1 to 1.0×10^-6mol/L with a detection limit 8.0×10^-7mol/L and a slope of -52.0 mV/dec in phosphorate buffer solution of pH=5.0 at 25 ℃. The response mechanism is discussed in view of the a.c. impedance technique and the UV spectroscopy technique. The electrode based on binuclear cobalt(Ⅱ) compound was used to determine the thiocyanate content in waste water with satisfactory results.

Key words: Bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ), Neutral carrier, Ion-selective electrode, Thiocyanate

CLC Number:

O657

TrendMD:

WANG Xiu-Ling, YUAN Ruo, XU Lan, CHAI Ya-Qin, SUN Zhi-Yong , HUANG Xiao-Jing, LI Qun-Fang, ZHAO Qin. Studies on Highly Selective Thiocyanate Electrode Based on Bisbebzoin-semi-triethylenetetraamine Binuclear Cobalt Complex as Neutral Carriers[J]. Chem. J. Chinese Universities, 2004, 25(4): 633.

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Studies on Highly Selective Thiocyanate Electrode Based on Bisbebzoin-semi-triethylenetetraamine Binuclear Cobalt Complex as Neutral Carriers

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