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Published online 11 May 2005
Published in J Environ Qual 34:1016-1025 (2005)
DOI: 10.2134/jeq2003.0421
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sources and Evolution of Anthropogenic Lead in Dated Sediments from Lake Clair, Québec, Canada

Sabary Omer Ndzangoua, Marc Richer-Laflèchea,* and Daniel Houleb

a Université du Québec, INRS-Eau-Terre-Environnement, 490 rue de la Couronne, Québec, Québec, Canada G1K 9A9
b Direction de la recherche forestière, Min. des Ressources Naturelles de la Faune et des Parcs du Québec, 2700 rue Einstein, Sainte-Foy, Québec, Canada G1P 3W8



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  		Fig. 1. (a) Map of the study area and (b) Lake Clair bathymetric map showing sampling site (modified from D'Arcy, 1993).

 


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  		Fig. 2. Radio-chronological data of the top 9.5 cm of Lake Clair sediments. (a) Variation of 137Cs activity vs. depth and (b) variation of unsupported 210Pb activity vs. cumulative mass of sediments. Error bars are counting error (±SE). (c) Approximate year of sedimentation vs. depth. The year of sedimentation was derived from the 210Pb constant flux–constant sedimentation (CFCS) model (Oldfield and Appleby, 1984; Robbins and Herche, 1993).

 


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  		Fig. 3. Variations of Pb and Se contents, Pb/Al, and Pb isotopic ratios in Lake Clair sediments vs. depth and approximate year of sedimentation. The vertical dashed line (S.P.) shows the isotopic composition of settling particles collected in sediment traps.

 


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  		Fig. 4. Calculated excess Pb flux and corresponding 206Pb/207Pb ratios in Lake Clair sediments accumulated since 1872 vs. approximate year of sedimentation.

 


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  		Fig. 5. Relative emissions of Pb to the atmosphere from different sources in the United States. Data are derived from Graney et al. (1995).

 




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