Document Detail


Vertical and temporal distribution of persistent organic pollutants in Toronto. 1. Organochlorine pesticides.
MedLine Citation:
PMID:  17438759     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
From May to September 2005, five passive air samples were deployed over five, 1-month periods at five elevations on the CN Tower in Toronto, Canada, to investigate the vertical distribution, seasonality, and sources of organochlorine pesticides. A strong seasonality was observed between spring and the end of summer. Vertical profiles differed for different pesticide classes. For instance, alpha- and gamma-hexachlorocyclohexane exhibited higher concentrations (60-80 pg m(-3), respectively) near the ground during the spring and early summer, suggesting that surface-air exchange within the city or nearby Lake Ontario may be important sources. The vertical profile for chlordane isomers was variable, suggesting that both advective and local inputs are important. For dieldrin, no obvious trend with elevation was observed, suggesting that concentrations could reflect a regional air mass contamination. Strongest seasonality was observed for the endosulfans, a widely used pesticide in North America, that reached peak concentrations of 750-850 pg m(-3) during June/July. Advective inputs of endosulfan from regional or more distant agricultural regions can explain the relatively uniform concentrations with elevation throughout the study period. The approach used in this study demonstrates that monthly average vertical concentration profiles differ between pesticide groups and reflect their use as well as the relative magnitude of input from local versus regional sources.
Authors:
Elodie Moreau-Guigon; Anne Motelay-Massei; Tom Harner; Karla Pozo; Miriam Diamond; Marc Chevreuil; Helene Blanchoud
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental science & technology     Volume:  41     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-18     Completed Date:  2007-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2172-7     Citation Subset:  IM    
Affiliation:
Science and Technology Branch, Environment Canada, Toronto, Ontario, M3H 5T4, Canada.
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*
Air Pollution / analysis*
Altitude
Chromatography, Gas
Cities
Environmental Monitoring / methods,  statistics & numerical data*
Hydrocarbons, Chlorinated / analysis*
Ontario
Pesticides / analysis*
Seasons
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Hydrocarbons, Chlorinated; 0/Pesticides

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


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