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Hydrocarbons in Lake Washington Sediments. A 25-Year Retrospective in an Urban Lake

Wakeham, Stuart G. and Forrest, James and Masiello, Caroline A. and Gélinas, Yves and Alexander, Clark R. and Leavitt, Peter R. (2004) Hydrocarbons in Lake Washington Sediments. A 25-Year Retrospective in an Urban Lake. Environmental Science and Technology, 38 (2). pp. 431-439. ISSN 0013-936X. doi:10.1021/es0343149.

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Aliphatic and polycyclic aromatic hydrocarbon and stable and radiocarbon isotope distributions are compared for dated cores from the 1970s and 2000 for a 25-year retrospective in Lake Washington, Seattle, WA (USA). Contamination of Lake Washington sediments by petrogenic aliphatic hydrocarbons and pyrolytic polycyclic aromatic hydrocarbons via atmospheric deposition and stormwater runoff peaked between the 1950s and 1970s and has since decreased as stormwater inputs have been reduced. Radiocarbon signatures (Δ^(14)C, ‰) of total organic carbon decrease (increased “age”) in the depth interval of highest hydrocarbon concentration. Graphitic black carbon in the year 2000 core showed a historical profile similar to that of the PAH; however high background sediments deposited before the founding of Seattle indicates a considerable nonindustrial component derived from weathering in the watershed. Unlike hydrocarbon contamination, input of terrestrial organic matter (tracked by long-chain fatty alcohols) has increased throughout the late 20th century, documenting a shift in pollutant sources away from hydrocarbons and toward anthropogenic erosion of the region's soils.

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Additional Information:© 2004 American Chemical Society. Received for review April 7, 2003. Revised manuscript received October 23, 2003. Accepted October 27, 2003. Publication Date (Web): November 27, 2003. Roy Carpenter helped collect cores in the 1970s and Michael Peterson and the late John Hedges helped in 2000. E. R. M. Druffel, F. G. Prahl, and three anonymous reviewers gave inciteful comments on the paper. This research was supported by the Lawrence Livermore National Laboratory, the U.S. National Science Foundation, NSERC (Canada), and a fellowship from the Hanse Institute for Advanced Study (Hanse Wissenschaftskolleg) in Delmenhorst, Germany, to S.G.W.
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Lawrence Livermore National LaboratoryUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Hanse Institute for Advanced StudyUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20170315-090455936
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Official Citation:Hydrocarbons in Lake Washington Sediments. A 25-Year Retrospective in an Urban Lake Stuart G. Wakeham, James Forrest, Caroline A. Masiello, Yves Gélinas, Clark R. Alexander, and Peter R. Leavitt Environmental Science & Technology 2004 38 (2), 431-439 DOI: 10.1021/es0343149
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75134
Deposited By: Tony Diaz
Deposited On:15 Mar 2017 18:30
Last Modified:15 Nov 2021 16:31

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