NDLI: Interactions between uronic acids and chromium(III).

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Interactions between uronic acids and chromium(III).

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Interactions between uronic acids and chromium(III).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Cetin, Zeynep Kantar, Cetin Alpaslan, Musa
Description	Country affiliation: Turkey Author Affiliation: Cetin Z ( Department of Environmental Engineering, Mersin University, Engineering Faculty, Ciftlikkoy Kampusu, 33343 Mersin, Turkey.)
Abstract	Laboratory ion-exchange experiments were performed to investigate the complexation behavior of Cr(III) with uronic acids, such as galacturonic, glucuronic, and alginic acid (main constituents of bacterial exopolymeric substances). The experimental data were analyzed with a chemical equilibrium model in FITEQL to determine the reaction stoichiometries and stability constants for the formation of Cr-ligand complexes. Analysis of ion-exchange data with a chemical model indicates that the accurate description of Cr(III) complexation with both glucuronic and galacturonic acids requires postulation of a mixture of 1:1/1:2 complexes between Cr(III) and ligands under the experimental conditions studied (e.g., pH 4), but that the Cr-alginic acid binding can be modeled based on a reaction stoichiometry of 1:1 Cr-alginic acid complexes. Because of the complex nature of alginic acid, a nonelectrostatic, discrete ligand approach was used to determine proton and Cr binding with the functional groups of alginic acid. In this approach, alginic acid was conceptualized as being composed of a suite of two monoprotic acids (HL1 and HL2) with arbitrarily assigned pKa values of two and four, respectively. The results indicate that Cr binding with uronic acids mainly occurs through carboxylic groups under acidic to slightly alkaline pH conditions (e.g., pH < 8). The overall results of the present study indicate that the formation of such Cr-ligand complexes may have a pronounced effect on Cr(III) transport, solubility and bioavailability in natural systems.
File Format	HTM / HTML
ISSN	07307268
Issue Number	8
Journal	Environmental Toxicology and Chemistry
Volume Number	28
e-ISSN	15528618
Language	English
Publisher	Wiley
Publisher Date	2009-08-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Chemistry Environmental Pollutants Discipline Environmental Health Chromium Discipline Toxicology Discipline Chemistry Uronic Acids Ion Exchange Potentiometry Journal Article
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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