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D. V. Snigur, V. P. Dubovyi, A. N. Chebotarev
Atomic-absorption
determination of copper(II) in water samples after its cloud point extraction
preconcentration
Abstract
The conditions of cloud point extraction
preconcentration of Cu(II) in the form of its complex with
6,7-dihydroxy-4-methyl-2-phenylbenzopyrylium chloride in the micellar phase of
non-ionic surfactant Triton X-100 were studied and optimized. It was established
that with the introduction of ammonium benzoate into solution with Triton X-100
concentration 0.4% (w/w) and adjusting pH to 4.5, the formation of the micellar
phase is observed at room temperature. A method for the atomic absorption
determination of Cu(II) after its cloud point extraction preconcentration was
developed. The calibration curve is linear in the concentration range 5.0–213 μg/L, and the LOD and LOQ are respectively 1.5 and
5.0 μg/L. The proposed method
was applied to analyze the waters of different categories, and the RSD does not exceed 0.04.
Key words:
cloud point extraction, atomic absorption spectroscopy, copper(II), water
analysis.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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