Computer Science
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3297r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 15, pp.3297-3305
Computer Science
2
Scientific paper
Measurements of lead concentrations and stable lead isotopic compositions ( 204 Pb, 206 Pb, 207 Pb, 208 Pb) in sediment cores from Lake Erie document both temporal and spatial variations in lead sources to the lake. These analyses track the history of lead contamination in the lake, as well as the transport of particulate matter which governs the redistribution of particle-reactive contaminants within the lake. The isotopic compositions of the sediments reveal two sources of natural lead (fluvial and shoreline bluff erosion) and three primary sources of anthropogenic lead (coal combustion, gasoline additives, and municipal waste water discharges) to the lake. Lead concentrations and isotopic compositions of 210 Pb-dated sediment cores record historical variations in the inputs from these sources. The heterogeneous isotopic composition of the three basins of Lake Erie indicates that lead from municipal effluent is most prominent in the urbanized western region of the lake and that atmospheric deposition is most prominent in the more rural eastern areas. Calculations based on a 207 Pb / 206 Pb vs . 208 Pb / 206 Pb linear mixing model show that as much as 70% of sediment in the Central Basin and 25% in the East Basin originates from the West Basin of Lake Erie. These calculations attest to the interbasinal redistribution of particle-reactive contaminants within the lake.
Esser Brad K.
Flegal Russell A.
Niemeyer Sid
Ritson Peter I.
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