Recent increase in atmospheric deposition of mercury to California aquatic systems inferred from a 300-year geochronological assessment of lake sediments

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Sanders, R. D., Coale, K. H., Gill, G. A., Andrews, A. H., & Stephenson, M. (2008). Recent increase in atmospheric deposition of mercury to California aquatic systems inferred from a 300-year geochronological assessment of lake sediments. Applied Geochemistry, 23(3), 399-407. doi:10.1016/j.apgeochem.2007.12.021
Metadata
TitleRecent increase in atmospheric deposition of mercury to California aquatic systems inferred from a 300-year geochronological assessment of lake sediments
AuthorsD. Sanders, H. Coale, A. Gill, H. Andrews, M. Stephenson
AbstractAge-dated sediment cores from 4 remote lakes across California were analyzed for total Hg (Hg T) concentration as a function of pre- and post-industrialization. Particle size, magnetic susceptibility and organic C and N, were measured to determine if the Hg concentration in sediment cores could be related to atmospheric deposition and/or watershed processes. Results indicate that (a) for each lake modern (1970-2004) Hg T lake sediment concentrations have increased by an average factor of 5 times more than historic (pre-1850) Hg T concentrations; (b) the ratio of modern to pre-industrial lake sediment Hg T for these lakes are higher than estimated for other locations where atmospheric deposition is presumed to be the main source of Hg; (c) 2 of the 4 studied lakes demonstrated significant relationships between Hg T concentrations and percentage organic material (r 2 = 0.68 and p < 0.01; r 2 = 0.67 and p < 0.01) whereas the other two indicated no significant relationship (r 2 = 0.05 and p = 0.51; r 2 = 0.12 and p = 0.36). © 2007 Elsevier Ltd. All rights reserved.
JournalApplied Geochemistry
Date2008
Volume23
Issue3
Start page399
End page407
ISSN08832927
SubjectsDeposition, Geochronology, Magnetic susceptibility, Particle size, Sediments, Aquatic systems, Atmospheric deposition, Geochronological assessment, HgT, Mercury compounds, assessment method, concentration (composition), industrialization, lacustrine deposit, mercury (element), sediment core, California, North America, United States
NoteCited By (since 1996):13, CODEN: APPGE

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