Document Detail

Electromigration of Mn, Fe, Cu and Zn with citric acid in contaminated clay.
MedLine Citation:
PMID:  18569291     Owner:  NLM     Status:  MEDLINE    
Metal reactivity, speciation and solubility have an important influence in its transportation through a porous matrix by electrokinetics and, therefore, they dramatically affect the removal efficiency. This work deals with the effect of solubility and transport competition among several metals (Mn, Fe, Cu and Zn) during their transport through polluted clay. The unenhancement electrokinetic treatment results in a limited removal of the tested metals because they were retained into the kaolinite sample by the penetration of the alkaline front. Metals showed a removal degree in accordance with the solubility of the corresponding hydroxide and its formation pH. In 7 days of treatment, the removal results were: 75.6% of Mn; 68.5% of Zn, 40.6% of Cu and 14.8% of Fe. In order to avoid the negative effects of the basic front generated at the cathode, two different techniques were proposed and tested: the addition of citric acid as complexing agent to the polluted kaolinite sample and the use of citric acid to control de pH on the cathode chamber. Both techniques are based on the capability of citric acid to act as a complexing and neutralizing agent. Almost complete removal of Mn, Cu and Zn was achieved when citric acid was used (as neutralizing or complexing agent). But Fe only reached 33% of removal because it formed a negatively charged complex with citrate that retarded its transportation to the cathode.
M Pazos; S Gouveia; M A Sanroman; C Cameselle
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering     Volume:  43     ISSN:  1093-4529     ISO Abbreviation:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-06-23     Completed Date:  2008-09-22     Revised Date:  2009-08-14    
Medline Journal Info:
Nlm Unique ID:  9812551     Medline TA:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  823-31     Citation Subset:  IM    
Department of Chemical Engineering, University of Vigo, Vigo, Spain.
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MeSH Terms
Aluminum Silicates / chemistry*
Citric Acid / chemistry*
Copper / chemistry
Electrochemistry / instrumentation,  methods*
Hydrogen-Ion Concentration
Iron / chemistry
Kaolin / chemistry
Manganese / chemistry
Metals, Heavy / chemistry*
Soil Pollutants / chemistry*
Zinc / chemistry
Reg. No./Substance:
0/Aluminum Silicates; 0/Metals, Heavy; 0/Soil Pollutants; 1302-87-0/clay; 1332-58-7/Kaolin; 7439-89-6/Iron; 7439-96-5/Manganese; 7440-50-8/Copper; 7440-66-6/Zinc; 77-92-9/Citric Acid

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

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