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D. V. Chernyshov, M. G. Khrenova, I. V. Pletnev, V. Ye. Baulin, N. V. Shvedene
Ionic Liquid Based on
Quarternary Phosphonium Cation as Plasticizer and Electrode-Active Component of
Ion-Selective Electrode Membranes
Abstract
Ionic liquid
dodecylethyldiphenylphosphonium bis(trifluoromethylsulphonyl)imide
behaves as both plasticizer and electrode-active component in the membranes of
ion-selective electrodes (ISE). Stable potentiometric response towards
cationogenic surfactants is observed. The slope of electrode function is close
to Nernstian value (cetylpyridinium and cetyltrimethylammonium bromides;
detection limits are (5±1)´10–6 M and (1,3±0,3)´10–5 M respectively). Membrane potential does not depend on
the pH in the range from 3 to 11. The possibility of determination of the
critical micelle concentration (CMC) with the ISE is demonstrated.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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