Room temperature cloud point extraction: An application to preconcentration and spectrophotometric determination of copper(II) - Short communication

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Published: Feb 13, 2020
DOI: https://doi.org/10.2298/JSC190212087S
Keywords:
cloud point extraction spectrophotometry copper(II) water analysis surfactant rich phase

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Denys Snigur
Odessa I.I. Mechnikov National University, Department of Analytical Chemistry, Dvoryanskaya str. 2, Odessa 65082
http://orcid.org/0000-0002-4183-0321
Alexander Chebotarev
Odessa I.I. Mechnikov National University, Department of Analytical Chemistry, Dvoryanskaya str. 2, Odessa 65082
Vitaliy Dubovyi
Odessa I.I. Mechnikov National University, Department of Analytical Chemistry, Dvoryanskaya str. 2, Odessa 65082
Dmytro Barbalat
Odessa I.I. Mechnikov National University, Department of Analytical Chemistry, Dvoryanskaya str. 2, Odessa 65082
Anastasiia Klochkova
Odessa I.I. Mechnikov National University, Department of Analytical Chemistry, Dvoryanskaya str. 2, Odessa 65082

Abstract

The novel cloud point extraction procedure for preconcentration of copper(II) was discovered. A simple chemical method for initiating the cloud point extraction (CPE) has been proposed. The formation of surfactant rich phase in a system containing a nonionic surfactant Triton X-100, copper(II), 6,7-dihydroxy-4-methyl-2-phenylbenzopyrilium chloride (DHMPhB) and ammonium benzoate is observed immediately upon the sulfuric acid addition into solution. Under the optimal conditions (absorption band maximum was 540 nm, concentration 1.5×10-4 mol dm‑3 of DHMPhB, 1.0 vol.% of Triton X-100, 2.0 cm3 of 0.75 mol dm-3 ammonium benzoate, and 1.0 cm3 of 0.5 mol dm-3 sulfuric acid solution for obtaining benzoic–benzoate buffer solution with pH 4.5 and initiation immediate surfactant rich phase formation) the calibration plot for spectrophotometric determination of copper(II) was linear in the range of copper(II) concentration 0.02–0.95 µg cm−3. The limit of detection was cal­culated 0.006 µg cm−3. The water samples were analyzed according to a sug­gested procedure with satisfactory results.

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How to Cite
[1]
D. Snigur, A. Chebotarev, V. Dubovyi, D. Barbalat, and A. Klochkova, “Room temperature cloud point extraction: An application to preconcentration and spectrophotometric determination of copper(II) - Short communication”, J. Serb. Chem. Soc., vol. 85, no. 1, pp. 89–96, Feb. 2020.
Issue
Vol. 85 No. 1 (2020)
Section
Analytical Chemistry

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