Thiocyanate selective PVC Membrane Electrodes Based on Organotin(Ⅳ)Compounds as Neutral Carriers

Abstract

Abstract: The paper describes solvent polymeric membrane anion selective electrodes based on t ribenzyltin pHenolates as neutral carriers.The Electrode based on tribenzyltin p-nitrophenolatepossesses excellent potentiomet ric response characteristics and selectivity towards thiocyanate, The linear range is(0.1246)×10^-5mol/Lwith a slope of -56.8.The Electrode demonst rates anti-Hof meister behavior, and The selectivity sequence observed is:t hiocyanate>benzoate>perchlo-rate>iodide>nitrite>nitrate>acetate>bromide>chloride.The potentiometric response charac-teristics and selectivity have a close relationship with The structure of The carriers, as The substitute in pHenol ring changes from nitro-to hydrogen, then to t-butyl, the potentiometric response characteristics and selectivity to t hiocyanate deteriorate to some extent.The Electrode based on tribenzyltin p-nitrophenolate has a fast response time, fair stability and reproducibility and could be used for The detection of thiocyanate in act ual samples with satisfactory results.

Key words: Ion-selective electrodes, Thiocyanate, Tribenzyltin phenolate, Neutral carriers

CLC Number:

O657

TrendMD:

LI Zhi-Qiang, SONG Xiao-Ping, YUAN Ruo, YING Min, SHEN Guo-Li, YU Ru-Qin . Thiocyanate selective PVC Membrane Electrodes Based on Organotin(Ⅳ)Compounds as Neutral Carriers[J]. Chem. J. Chinese Universities, 1999, 20(1): 47.

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Thiocyanate selective PVC Membrane Electrodes Based on Organotin(Ⅳ)Compounds as Neutral Carriers

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