| Long-term atmospheric deposition of current-use and banned pesticides in Atlantic Canada; 1980-2000. | |
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MedLine Citation:
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PMID: 17936874 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Guy L Brun; Ronald M MacDonald; Jessica Verge; Jamie Aubé |
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Publication Detail:
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Type: Journal Article Date: 2007-10-22 |
Journal Detail:
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Title: Chemosphere Volume: 71 ISSN: 0045-6535 ISO Abbreviation: Chemosphere Publication Date: 2008 Mar |
Date Detail:
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Created Date: 2008-02-25 Completed Date: 2008-06-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0320657 Medline TA: Chemosphere Country: England |
Other Details:
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Languages: eng Pagination: 314-27 Citation Subset: IM |
Affiliation:
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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> |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Air Pollutants
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analysis*,
chemistry Atmosphere* Canada Environmental Monitoring Geography Pesticides / analysis*, chemistry Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Air Pollutants; 0/Pesticides |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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