Document Detail


Seasonal and spatial variation of polychlorinated naphthalenes and non-/mono-ortho-substituted polychlorinated biphenyls in arctic air.
MedLine Citation:
PMID:  15575266     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Archived extracts of weekly air samples collected at remote arctic monitoring stations at Alert and Tagish, Canada, and Dunai Island, Russia, in 1994-1995 were combined into 4-week composites and analyzed for levels and seasonal trends of polychlorinated naphthalenes (PCNs) and non- and mono-ortho-substituted polychlorinated biphenyls (PCBs). Mean annual sigmaPCN concentrations were 0.69, 0.82, and 0.38 pg/m3 at Alert, Dunai, and Tagish, respectively. PCNs exhibited a seasonal trend at Alert and Dunai, with higher levels occurring during winter when air masses originating over Eurasia influence the high arctic and coincide with the haze period. Episodic, trans-Pacific transport impacted PCN concentrations at Tagish. A seasonal trend was not evident for the non-/mono-o-PCBs. The contrary PCN and non-/mono-o-PCB trends indicate that the sources of these two compound classes to arctic air differ, and that atmospheric transport from source regions has a greater influence on PCN levels than for non-/ mono-o-PCBs. PCNs apparently originating from combustion sources contribute to levels in winter, as indicated by the presence of combustion marker congeners, but evaporative emissions from source regions are likely the dominant source. PCNs contributed 71 and 75% of dioxin toxic equivalents (TEQ) relative to the non-/mono-o-PCBs at Alert and Dunai and 30% at Tagish during the winter months, demonstrating the toxicological importance of PCNs as a compound class relative to PCBs.
Authors:
Paul A Helm; Terry F Bidleman; Henrik H Li; Phil Fellin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  38     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-12-03     Completed Date:  2005-03-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5514-21     Citation Subset:  IM    
Affiliation:
Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, M5S 3E5 Canada. Paul.Helm@ene.gov.on.ca
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*
Arctic Regions
Canada
Chlorine Compounds / analysis*
Dioxins / analysis
Incineration
Naphthalenes / analysis*,  chemistry
Polychlorinated Biphenyls / analysis*
Russia
Seasons
Volatilization
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Chlorine Compounds; 0/Dioxins; 0/Naphthalenes; 0/Polychlorinated Biphenyls

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


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