Document Detail


Removal of aldrin, dieldrin, heptachlor, and heptachlor epoxide using activated carbon and/or Pseudomonas fluorescens free cell cultures.
MedLine Citation:
PMID:  16785166     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Degradation of aldrin (1,2,3,4,10,10-Hexachloro-1,4,4a,5,8,8a-hexahydro-1,4:5-8-dimethanonaphthalene), heptachlor (1H-1,4,5,6,7,8,8-heptachloro-3a,4,7,7a-tetrahydro-4,7-methano indene), dieldrin (1aalpha,2beta,2aalpha,3beta,6beta,6aalpha,7beta,7aalpha)-3,4,5,6,9,9-Hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-2,7:3,6-d-methanonaphtha[2,3-b]oxirene, and heptachlor epoxide (1aalpha, 1bbeta,2alpha,5alpha,5alphabeta,6beta,6aalpha-2,3,4,5,6,7,7-Heptachloro-1a,1b,5,5a,6,6a-hexahydro-2,5-methano-2H-inden[1,2-b]-oxirene) was tested using free cultures of Pseudomonas fluorescens under controlled conditions. Pesticide concentrations were monitored by gas chromatography during 120 h. Percentages of degradation and biodegradation rates (BDR) were calculated. Data showed a trend suggesting a relation between chemical structure and degradability. Degradation kinetics for each pesticide tested showed that the highest degradation rates were found in the first 24 h. Kinetics data were adjusted to an empirical equation in order to predict their behavior, and the correlation coefficients obtained were satisfactory. Gas chromatography/mass spectrometry (GC/MS) analysis of the final extracts allowed the identification of chlordene and monodechlorodieldrin, which have been reported as final metabolite produced in the biodegradation of this kind of compounds. Regarding adsorption of pesticides on activated vegetal carbon, we concluded that removal efficiencies between 95.45 and 97.18% can be reached, depending on the pesticide and the carbon dose applied. The values for K from the Freundlich equation were quite similar for the four pesticides (between 1.0001 and 1.04), whereas the n values were quite different for each pesticide in the following order of affinity: dieldrin > aldrin > heptachlor epoxide > heptachlor. Equilibrium times, very important for scaling up the process, were between 43 min and 1 h, for the heptachlor epoxide and the heptachlor, respectively.
Authors:
Erick R Bandala; Juan Andres-Octaviano; Paulino Pastrana; Luis G Torres
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes     Volume:  41     ISSN:  0360-1234     ISO Abbreviation:  J Environ Sci Health B     Publication Date:  2006  
Date Detail:
Created Date:  2006-06-20     Completed Date:  2006-08-24     Revised Date:  2009-07-21    
Medline Journal Info:
Nlm Unique ID:  7607167     Medline TA:  J Environ Sci Health B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  553-69     Citation Subset:  IM    
Affiliation:
Instituto Mexicano de Tecnología del Agua México. ebandala@tlaloc.imta.mx
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Aldrin / analysis,  chemistry,  metabolism
Biodegradation, Environmental
Charcoal / chemistry*
Chromatography, Gas
Dieldrin / analysis,  chemistry,  metabolism
Gas Chromatography-Mass Spectrometry
Heptachlor / analysis,  chemistry,  metabolism
Heptachlor Epoxide / analysis,  chemistry,  metabolism
Insecticides / analysis,  chemistry*,  metabolism*
Kinetics
Pseudomonas fluorescens / metabolism*
Soil Microbiology
Soil Pollutants / analysis
Chemical
Reg. No./Substance:
0/Insecticides; 0/Soil Pollutants; 1024-57-3/Heptachlor Epoxide; 16291-96-6/Charcoal; 309-00-2/Aldrin; 60-57-1/Dieldrin; 76-44-8/Heptachlor

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


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