Abstract
Long-term atmospheric deposition of Pb has been measured using lake sediment cores. The average ‘whole-lake’ Pb burden was measured for several lakes in each of four regions located throughout Ontario and Quebec, Canada. Since the regions were remote to any point source of Ph, large scale variation in atmospheric transport could be studied. The results indicate that Pb deposition is highest in South-Central Ontario, where lake burdens ranged from 312 to 432 mg m−2, and that it decreases in an eastward direction into Quebec. Lowest deposition was at the site farthest north, Schefferville, Quebec, where fallout was 31 to 42 mg m−2, less than one-tenth of that previously observed in South-Central Ontario. Lead-210 dating of sediment cores from the northern site showed that input to these remote lakes has occurred over the same time period as in the southern sites.
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Deceased.
Contribution No. 2 of the Trent Aquatic Research Centre.
Contribution No. 127 of the McGill Limnology Research Centre.
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Douglas Evans, R., Rigler, F.H. Long distance transport of anthropogenic lead as measured by lake sediments. Water Air Soil Pollut 24, 141–151 (1985). https://doi.org/10.1007/BF00285439
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DOI: https://doi.org/10.1007/BF00285439