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V. V. Sviridov, O. A. Avramenko, A. A. Rayeva, I. V. Pletniov, V. E. Baulin, N. V. Shvedene

Nitrate-containing ionic liquids as active membrane components of nitrate-selective electrodes

Abstract

Two dialkylimidazolium-based ionic liquids were investigated as active components in the PVC membranes of nitrate ion-selective electrodes (ISE). The main potentiometric characteristics including selectivity to nitrate ion and pH-function were studied. The membranes involved contain 5% of active component and display close to theoretical response for nitrate ion. Using of more hydrophobic ionic liquid increases the sensitivity up to 57 mV/pC and decreases the low detection limit (Cmin=3.7·10–6 M). In comparison to commercial nitrate-selective electrode ELIT 021 advantages of ISE developed were found: the lower Cmin and the lower time of response. It was shown that ISE developed is applicable for direct potentiometric detection of ionic liquids containing nitrate ion in aqueous solutions.
Moscow University Chemistry Bulletin.
2007, Vol. 48, No. 4, P. 245
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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