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Speciation, separation and enrichment of Cr(III) and Cr(VI) in environmental samples by ion-pair solvent extraction using a -diketone ligand

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A simple speciation, separation and enrichment method has been developed for the determination of Cr(III) and Cr(VI) ions in different samples by ion-pair solvent extraction with a -diketone ligand, 2-(4-methoxybenzoyl)-N'-benzylidene-3-(4-methoxyphenyl)-3-oxo-N-phenyl-propono hydrazide (MBMP). Cr(III) was separated from Cr(VI) as Cr(III)-(MBMP)-perchlorate ternary ion-pair complex. The influences of various analytical parameters including pH, amount of reagent, shaking time, sample volume and ionic strength on the recovery of Cr(III) and/or Cr(VI) were investigated. Total chromium was obtained after reducing Cr(VI) to Cr(III) with NH2OH · HCl. Recoveries were found to be higher than 95% and the relative standard deviation (RSD) was less than 2%. The method detection limit based on 3 criterion for Cr(III) was found to be 0.32 µg L-1. The formed ternary ion-pair complex, Cr(III) : MBMP : 2ClO4, has a molar ratio of 1 : 1 : 2. The developed method has been applied successfully to the speciation of chromium in various natural water, soil, sediment and hair samples with satisfactory results.
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Keywords: atomic absorption spectrometry; chromium(III/VI); ion-pair; solvent extraction; speciation

Document Type: Research Article

Affiliations: Department of Chemistry, Faculty of Arts and Sciences, Erciyes University, Kayseri, Turkey

Publication date: April 1, 2011

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