Document Detail


Dissolution of mimetite Pb(5)(AsO(4))(3)Cl in low-molecular-weight organic acids and EDTA.
MedLine Citation:
PMID:  21345478     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Due to its relatively low solubility, mimetite Pb(5)(AsO(4))(3)Cl may control Pb and As(V) solution levels at a low value in contaminated soils. The time-dependent dissolution of mimetite by low-molecular-weight organic acids (LMWOAs) such as acetic, lactic, citric, and ethylene diamine tetra-acetic acid (EDTA) was determined. At pH 3.5, the presence of citric acid or EDTA significantly increases the solubility of mimetite while acetic or lactic acids show little effect. The effect of all organic anions on the dissolution of mimetite increased with the increase in solution pH. The rate of mimetite dissolution depended on the kind and concentration of organic solvents in the sequence r(EDTA)>r(lactate)>r(acetate)>r(citrate). Soluble Pb and As(V) released in LMWOAs and EDTA were higher than the WHO guideline value for these elements in drinking water (10μgAs(V)L(-1), 10μgPbL(-1)). This suggests that soil organic acids in rhizosphere can potentially liberate Pb and As(V) from mimetite in contaminated soils.
Authors:
Tomasz Bajda
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-21
Journal Detail:
Title:  Chemosphere     Volume:  -     ISSN:  1879-1298     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-2-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, Department of Mineralogy, Petrography and Geochemistry, al. Mickiewicza 30, 30-059 Krakow, Poland.
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