Document Detail


Oxidative decomposition of atrazine by a Fenton-like reaction in a H2O2/ferrihydrite system.
MedLine Citation:
PMID:  17084878     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The oxidation of atrazine (ATZ) was studied in the presence of hydrogen peroxide (H(2)O(2)) and ferrihydrite at different concentrations and pHs. The rate of ATZ oxidation increased with H(2)O(2) concentration and is independent of pH ranging from 4 to 8. However, at pH 3 an increase of ten times in the rate of ATZ oxidation was observed due to the mineral dissolution. The decomposition rate of H(2)O(2) was three times higher at pH 8 than 3 and increased with increase of both H(2)O(2) and ferrihydrite concentrations. The results indicate that ferrihydrite controls oxidation of ATZ by H(2)O(2) in two different ways: (i) mineral dissolution at low pH allowing the Fenton reaction to proceed in solution and (ii) surface-mediated decomposition of H(2)O(2) producing non-reactive oxygen species in particular at higher pH. Three degradation products (desethylatrazine, desisopropylatrazine, and 2-hydroxyatrazine) were identified and corroborate with a Fenton reaction taking place in solution.
Authors:
Juliana C Barreiro; Milton Duffles Capelato; Ladislau Martin-Neto; Hans Christian Bruun Hansen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-11-07
Journal Detail:
Title:  Water research     Volume:  41     ISSN:  0043-1354     ISO Abbreviation:  Water Res.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2006-12-06     Completed Date:  2007-05-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  55-62     Citation Subset:  IM    
Affiliation:
Departamento de Química, UFSCar, Rod. Washington Luís (SP-310), Km 235, 13565-905 São Carlos (SP), Brazil. juliana.barreiro@gmail.com
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MeSH Terms
Descriptor/Qualifier:
Atrazine / metabolism*
Ferric Compounds / metabolism*
Hydrogen Peroxide / metabolism*
Hydrogen-Ion Concentration
Iron / metabolism*
Kinetics
Oxidation-Reduction
Chemical
Reg. No./Substance:
0/Fenton's reagent; 0/Ferric Compounds; 1912-24-9/Atrazine; 39473-89-7/ferrihydrite; 7439-89-6/Iron; 7722-84-1/Hydrogen Peroxide

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


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