PRODUCTS OF THE INTERACTION OF CHROMIUM(VI) WITH SOME DERIVATIVES OF 6,7-DIHYDROXYBENZOPYRILYLIUM SALTS AND THEIR APPLICATION IN CLOUD POINT EXTRACTION

Authors

DOI:

https://doi.org/10.15421/jchemtech.v33i4.342853

Keywords:

6,7-dihydroxybenzopyrylium salts, chromium(VI), spectrophotometry, potentiometry, electrothermal atomic-absorption spectrometry, cloud point extraction

Abstract

The interaction of chromium(VI) with a series of alkyl- and phenyl-substituted salts of 6,7-dihydroxybenzopyrylium was studied. Using spectrophotometric methods, the stoichiometry of the reaction products was established. Based on the data obtained from potentiometric, spectrophotometric, and mass spectrometric studies, a reaction mechanism was proposed. The chemical and analytical characteristics of the reaction products were determined, and it was noted that the most intensely colored analytical forms were those based on perchlorates of 6,7-dihydroxy-2,4-diphenylbenzopyrylium and 6,7-dihydroxy-4-methyl-2-phenylbenzopyrylium. The optimal conditions for micellar-extraction preconcentration of the reaction product of chromium(VI) with 6,7-dihydroxy-4-methyl-2-phenylbenzopyrylium perchlorate were established as follows: 1 vol.% Triton X-100, pH 2.0, 5×10⁻⁴ mol/dm³ of dye, 0.2 mol/dm³ sodium sulfate, and heating for 30 minutes at 70–80 °C. The calibration graph was linear within the concentration range of 0.05–1.7 mg/dm³, with detection and quantification limits of 0.015 and 0.05 mg/dm³, respectively. The developed method was tested on model solutions and samples of mineral waters.

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Published

2025-12-25

Issue

Vol. 33 No. 4 (2025): Journal of Chemistry and Technologies

Section

Analytical Chemistry

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