Speciation of chromium through aqueous two-phase extraction of complexes of Cr(III) with 4-(2-pyridylazo)resorcinol and Cr(VI) with 1,5-diphenylcarbazide

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Tamara N. Simonova
Valentina A. Dubrovina
Andriy B. Vishnikin
http://orcid.org/0000-0003-0148-7845

Abstract

A green, sensitive and selective methods are described for the pre­concentration and speciation of chromium species in natural waters. The developed methods are based on the environmentally friendly aqueous two-phase extraction with a system consisted of ammonium sulfate and polyethyl­ene glycol, or, alternatively, alcohol (ethanol, isopropanol). The extraction of chromium species from aqueous solution into the upper organic phase was performed with 4-(2-pyridylazo)resorcinol and 1,5-diphenylcarbazide as chel­ating agents for Cr(III) and Cr(VI), respectively. Some predominant factors affecting the preconcentration and speciation of both Cr(III) and Cr(VI) species were evaluated and optimized. The concentration of chromium species in upper organic phase was determined by both spectrophotometric and electrothermal atomic absorption spectrometry (ET AAS) methods. Under the optimum con­ditions, the calibration graphs obtained with spectrophotometric method were linear over the concentration ranges from 5 to 500 μg L-1 for Cr(III) and from 2.5 to 50 μg L-1 for Cr(VI). Corresponding concentration ranges determined by using ET AAS method were from 1 to 10 μg L-1 for both chromium species. The proposed methods were applied to the determination of chromium species in mine and waste waters with satisfactory results.

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How to Cite
[1]
T. N. Simonova, V. A. Dubrovina, and A. B. Vishnikin, “Speciation of chromium through aqueous two-phase extraction of complexes of Cr(III) with 4-(2-pyridylazo)resorcinol and Cr(VI) with 1,5-diphenylcarbazide”, J. Serb. Chem. Soc., vol. 81, no. 6, pp. 645–659, Jul. 2016.
Section
Analytical Chemistry
Author Biographies

Tamara N. Simonova, Department of Analytical Chemistry, Faculty of Chemistry, Donetsk National University, Donetsk 83001

Department of Analytical Chemistry, Docent

 

Valentina A. Dubrovina, Department of Analytical Chemistry, Faculty of Chemistry, Donetsk National University, Donetsk 83001

Department of Analytical Chemistry, Docent

Andriy B. Vishnikin, Department of Analytical Chemistry, Faculty of Chemistry, Oles Honchar Dnipropetrovsk National University, Dnipropetrovsk 49010

Head of Department of Analytical Chemistry