Investigation of 2-[2-(4-Methoxy-phenylamino)-vinyl]-1,3,3-trimethyl-3H-indolium Chloride as a New Reagent for the Determination of Chromium(VI) |
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Authors: | Vasil Andruch Monika Telepc˘áková Ioseph S. Balogh Nikoleta Urbanová |
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Affiliation: | (1) Faculty of Science, P.J. Šafárik University, Moyzesova 14, SK-04154 Košice, Slovak Republic, SK;(2) Department of Chemistry, College of Nyíregyháza, Sostoi u. 31/b, HU-4400 Nyiregyháza, Hungary, HU |
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Abstract: | The complex formation and extraction of chromium(VI) with 2-[2-(4-methoxy-phenylamino)-vinyl]-1,3,3-trimethyl-3H-indolium chloride reagent was studied by means of spectrophotometry. The influence of medium acidity, the concentration of chloride ions and dye reagent, the nature of the extractant and some other factors (time of extraction, stability of color, interference, etc.) on the absorbance of colored extracts were studied. The optimum conditions were found to be 0.02–0.1 M H2SO4, 1.0–1.5 M NaCl, (2.0–2.5) × 10−4 M of reagent. The absorbance of the colored extracts obeys Beer’s Law in the range of 0.26–7.28 mg L−1. The procedure of Cr(VI) extraction and spectrophotometric determination was examined. Author for correspondence. E-mail: andruch@kosice.upjs.sk Received November 19, 2002; accepted March 10, 2003 Published online June 13, 2003 |
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Keywords: | : Chromium(VI) 2-[2-(4-methoxy-phenylamino)-vinyl]-1,3,3-trimethyl-3H-indolium chloride complex formation extraction spectrophotometry. |
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