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