Accumulation of persistent organic pollutants in terrestrial vegetation from the Canadian Rocky Mountains.

Accumulation of persistent organic pollutants in terrestrial vegetation from the Canadian Rocky Mountains.

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dc.contributor.advisor Blais, Jules, en
dc.contributor.author Davidson, Deborah A. en
dc.date.accessioned 2009-03-23T13:01:34Z
dc.date.available 2009-03-23T13:01:34Z
dc.date.created 2002 en
dc.date.issued 2009-03-23T13:01:34Z
dc.identifier.citation Source: Masters Abstracts International, Volume: 41-02, page: 0540. en
dc.identifier.isbn 9780612727564 en
dc.identifier.uri http://hdl.handle.net/10393/6151
dc.description.abstract This thesis examines the accumulation of persistent organochlorine compounds in Canadian mountain environments through the sampling of air and coniferous vegetation along a 1430-meter elevation gradient in the Canadian Rocky Mountains. Results showed that lower temperatures encountered in high altitudes favor the accumulation of chemicals with higher volatility in vegetation. Air concentrations further suggest that the reason for this accumulation in elevated areas is increased atmospheric deposition from distant sources and not from temperature-induced revolatilization from local terrestrial surfaces. Seasonal decreases in plant concentrations indicate evaporative processes, and volatilization from vegetation was confirmed by calculated fugacity gradients. However, volatilization contributes very little to air concentrations and the subsequent fractionation upslope, which appears to be dominated by long-range transport. Multivariate analysis revealed that, in addition to cooler temperatures, other environmental conditions common to mountain ecosystems, such as elevated precipitation and lower pressure, promote chemical deposition onto vegetation. en
dc.format.extent 224 p. en
dc.publisher University of Ottawa (Canada). en
dc.subject.classification Biology, Ecology. en
dc.title Accumulation of persistent organic pollutants in terrestrial vegetation from the Canadian Rocky Mountains. en
dc.type M.Sc.Thesis (M.Sc.)--University of Ottawa (Canada), 2002. en

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