Document Detail


In situ stabilization of chromium(VI) in polluted soils using organic ligands: the role of galacturonic, glucuronic and alginic acids.
MedLine Citation:
PMID:  18387738     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Laboratory batch sorption and column experiments were performed to investigate the role of organic ligands such as galacturonic, glucuronic and alginic acids (main constituents of bacterial exopolymeric substances (EPS)) on Cr(VI) uptake and transport in heterogeneous subsurface media. Our batch sorption experiments demonstrate the addition of galacturonic, glucuronic and alginic acids to soils enhances Cr(VI) uptake by soil at pH values <7.7 depending on the concentration of the ligand and pH used. The enhanced Cr(VI) uptake at pH values <7.7 may be explained through either the catalytic reduction of Cr(VI) to Cr(III) by the surface-bound organic matter/Fe oxides and/or the dissolved metal ions (e.g., Fe(III)) from the soil. On the other hand, organic ligands have no or little effect on Cr(VI) uptake under highly alkaline pH conditions since the catalytic Cr(VI) reduction decreases with increasing pH. Similarly, the results from column experiments show that, depending on the concentration of organic ligands, the Cr(VI) breakthrough curves were significantly retarded relative to the organic acid-free systems at pH 7.6. A significant portion of Cr(VI) initially added to the feed solution was not readily recoverable in the effluent, indicating Cr(VI) reduction in columns, most probably catalyzed by surface-bound metal-oxides (e.g., Fe oxides) or dissolved metal ions such as Fe(II; III). The overall results suggest that EPS constituents such as glucuronic, galacturonic and alginic acids may play a significant role on Cr(VI) stabilization in subsurface systems under acidic to slightly alkaline pH conditions.
Authors:
Cetin Kantar; Zeynep Cetin; Hilal Demiray
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-02-16
Journal Detail:
Title:  Journal of hazardous materials     Volume:  159     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-20     Completed Date:  2009-01-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  287-93     Citation Subset:  IM    
Affiliation:
Mersin University, Engineering Faculty, Department of Environmental Engineering, Ciftllikoy Kampusu, 33343 Mersin, Turkey. ckantar@mersin.edu.tr
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Alginates / chemistry*
Catalysis
Chromium Compounds / chemistry*
Environmental Remediation
Glucuronic Acid / chemistry*
Hexuronic Acids / chemistry*
Hydrogen-Ion Concentration
Indicators and Reagents
Ligands
Organic Chemicals
Soil / analysis*
Soil Pollutants / chemistry*
Solutions
Chemical
Reg. No./Substance:
0/Alginates; 0/Chromium Compounds; 0/Hexuronic Acids; 0/Indicators and Reagents; 0/Ligands; 0/Organic Chemicals; 0/Soil; 0/Soil Pollutants; 0/Solutions; 14982-50-4/galacturonic acid; 576-37-4/Glucuronic Acid; 6814-36-4/mannuronic acid; 9005-32-7/alginic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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