Document Detail


Long-term atmospheric deposition of current-use and banned pesticides in Atlantic Canada; 1980-2000.
MedLine Citation:
PMID:  17936874     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The occurrence of current-use and banned pesticides is reported in wet-precipitation collected from four sites across Atlantic Canada during the period 1980-2000. The most frequently detected compounds were alpha-HCH, gamma-HCH (lindane), chlorothalonil, pentachlorophenol, atrazine, and endosulfan. Median site concentrations varied between not-detected and 10.2 ng l(-1). Deposition of HCHs (hexachlorocyclohexane), chlorothalonil, and endosulfan at Kejimkujik (Keji) and Jackson, Nova Scotia, were generally similar. Significant spatial differences (p<0.05), however, were found for the HCH isomers and endosulfan at Keji and Gros Morne (Newfoundland and Labrador), areas geographically separated by the northern Gulf of St. Lawrence. Long-term deposition of alpha-HCH decreased (p<0.05) at both Keji (1980-2000) and Gros Morne (1994-2000), with half-lives of 5.9 and 4.5 y, respectively. A decreasing trend was also found for pentachlorophenol with a half-life of 4.9 y at Jackson. Significant negative trends (p<0.05) were observed for alpha-/gamma-HCH ratios during the study at Keji and Jackson, possibly reflecting changes in production and use patterns of technical HCH and lindane on a continental and perhaps hemispheric scale. Seasonal trends for alpha-HCH and gamma-HCH were found to vary over the 20-y study period at Keji, however, spatial trends were generally similar between sites. Seasonal trends were observed with peak deposition generally occurring during the growing period (spring-summer) for the HCHs, chlorothalonil, endosulfan, and atrazine. Bimodal seasonal trends were also observed for these compounds with the exception of endosulfan.
Authors:
Guy L Brun; Ronald M MacDonald; Jessica Verge; Jamie Aubé
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Publication Detail:
Type:  Journal Article     Date:  2007-10-22
Journal Detail:
Title:  Chemosphere     Volume:  71     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-25     Completed Date:  2008-06-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  314-27     Citation Subset:  IM    
Affiliation:
Environment Canada, Science and Technology Branch, PO Box 23005, Moncton, New Brunswick, Canada E1A 6S8. guy.brun@ec.gc.ca <guy.brun@ec.gc.ca>
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*,  chemistry
Atmosphere*
Canada
Environmental Monitoring
Geography
Pesticides / analysis*,  chemistry
Time Factors
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Pesticides

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


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