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S. V. Smirnova, T. O. Samarina, D. V. Ilin, I. V. Pletnev
Solubilization of
4-(2-pyridylazo)resorcinol in hydrophobic-hydrophilic ionic liquids and
extraction of the heavy metal ions from aqueous solutions
Abstract
The distribution of
4-(2-pyridylazo)resorcinol (5·10–4–1·10–2M) in the
systems tetraoctylammonium N-lauroylsarcosinate (TOALS) – water and
trioctylmethylammonium salicylate (TOMAS) – water was studied. It is shown that
the distribution coefficient of PAR was not depended on the ionic state of the
reagent in aqueous solution at pH 2.3 – 11.8; lg D values were 3.5 and
3.7 (Vo:Vw = 1:20) for TOALS and TOMAS, respectively. The
conditions for quantitative extraction of ions of cadmium(II), lead(II),
cobalt(II), copper(II) and zinc(II) in TOALS and TOMAS in the presence of
4-(2-pyridylazo)resor-cinol were determined.
Key words: ionic liquids, solvent
extraction of metal, 4-(2-pyridylazo)resorcinol.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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