Document Detail


Wavelength dependent photoreactivity of mirex in Lake Ontario.
MedLine Citation:
PMID:  16509329     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Mirex is a toxic, hydrophobic pollutant in Lake Ontario that undergoes an indirect photoreaction mediated by natural dissolved organic matter. The monohydro product photomirex further photolyzes to form a dihydro product. The efficiency of mirex photolysis was determined as wavelength-dependent reaction quantum yield coefficients. Quantum yield coefficients were determined for 14 lake samples collected from multiple locations and overthe course of several weeks from one location. Values declined with increasing wavelength, with reactivity extending above 436 nm. Individual samples showed no seasonal trend. Pooled quantum yield coefficients and 95% confidence intervals were calculated by combining the results for all samples. Using the quantum yield coefficients within this confidence interval, mirex photolysis rates were accurately predicted during a sunlight exposure study for an independently collected water sample. In a relative rate experiment, the rate constants for mirex photolysis and subsequent photomirex photolysis were not significantly different from each other at the 95% confidence level, and this finding was further supported by the sunlight exposure results. Using the results from this study, it was estimated that, on a cloudless June day, the photolysis half-life of mirex in the epilimnion of Lake Ontario is 19 days.
Authors:
Kelly L Lambrych; John P Hassett
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental science & technology     Volume:  40     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-03-02     Completed Date:  2006-06-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  858-63     Citation Subset:  IM    
Affiliation:
Department of Chemistry, College of Environmental Science and Forestry, State University of New York, Syracuse, New York 13210, USA.
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MeSH Terms
Descriptor/Qualifier:
Environmental Monitoring
Great Lakes Region
Half-Life
Mirex / chemistry*
Photolysis
Seasons
Water Pollutants / analysis*
Chemical
Reg. No./Substance:
0/Water Pollutants; 2385-85-5/Mirex

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


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