Document Detail

Presence and implications of chemical contaminants in the freshwaters of the Canadian Arctic.
MedLine Citation:
PMID:  1514104     Owner:  NLM     Status:  MEDLINE    
Hydrocarbons, stable organochlorines, metals and radionuclides are widespread in the freshwaters of the Canadian Arctic. Petroleum-associated hydrocarbon sources include natural seepage, wastes and effluents from exploration, production and refining at Norman Wells and spills. Hydrocarbons also originate from combustion of carbon-based fuels, generally at lower latitudes and then reach the Arctic with air movements. Organochlorine compounds also move throughout the hemisphere by aerial pathways and have become distributed widely in Arctic fish. The organochlorine at highest concentration in Arctic freshwater is alpha-HCH, while those generally at highest concentrations in the fish are toxaphene, PCBs and chlordane. Metals are ubiquitous in Arctic freshwaters, with inputs of several metals by precipitation superimposed on natural geologic backgrounds. Mercury is found in muscle of fish from Arctic freshwaters at concentrations up to about 0.5 ppm. Radionuclides are also widespread at levels below those acceptable in food, with some local elevations near former mines. The implications of these contaminants for the northern ecosystems and the people dependent upon them are still not clear. Preliminary studies of inducible enzymes in fish suggest that the thresholds for biological damage have not been reached.
W L Lockhart; R Wagemann; B Tracey; D Sutherland; D J Thomas
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  The Science of the total environment     Volume:  122     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  1992 Jul 
Date Detail:
Created Date:  1992-09-28     Completed Date:  1992-09-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  165-245     Citation Subset:  IM    
Department of Fisheries and Oceans, Freshwater Institute, Winnipeg, Manitoba, Canada.
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MeSH Terms
Arctic Regions
Birds / metabolism
Fishes / metabolism
Fresh Water / chemistry*
Hydrocarbons / analysis*,  toxicity
Hydrocarbons, Chlorinated / analysis*,  toxicity
Mammals / metabolism
Metals / analysis*,  toxicity
Radioactive Pollutants / analysis*,  toxicity
Water Pollutants, Chemical / analysis,  toxicity
Reg. No./Substance:
0/Hydrocarbons; 0/Hydrocarbons, Chlorinated; 0/Metals; 0/Petroleum; 0/Radioactive Pollutants; 0/Water Pollutants, Chemical

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

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