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A. P. Smirnova, M. A. Proskurnin
An Investigation of Processes
in Two-Phase Systems Using Thermal-Lens Spectrometry: Extraction Determination
of Copper as Diethyldithiocarbaminate
Abstract
Performance parameters of
extraction–thermal-lens determination of copper by diethyldithiocarbaminate.
The minimum reagent-to-metal ratio providing 100% extraction is
60 : 1. The limit of detection of copper is 8ґ10–9 M. The process extraction of copper(II) with zinc
diethyldithiocarbaminate without mechanical shaking is considered. The
formation rate of the copper(II) chelate in chloroform is affected by two
processes: the diffusion of copper(II) ions through the phase interface and the
reaction of substitution of zinc ions to copper ions in zinc
diethyldithiocarbaminate. The dependence of the signal from copper(II)
diethyldithiocarbaminate in the organic phase on the distance to the interface
is studied; it was found that the process of diffusion of the formed complex in
the organic phase does not affect its degree of formation. The agreement of the
experimental data for the diffusion-dominated section of the kinetic curve with
a model based on Fick’s equation is shown.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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