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

STUART G. WAKEHAM; JAMES FORREST; CAROLINE A. MASIELLO; YVES GELINAS; CLARK R. ALEXANDER; PETER R. LEAVITT

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

机译：华盛顿湖沉积物中的碳氢化合物。市区湖泊25年回顾展

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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 (△14{sup left}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.

机译：在美国华盛顿州华盛顿湖的华盛顿湖进行了为期25年的回顾，比较了1970年代和2000年含日期的岩心的脂族和多环芳烃以及稳定和放射性碳的同位素分布。致动的脂族烃和热解多环芳烃通过大气沉积和雨水径流对华盛顿湖沉积物的污染在1950年代至1970年代达到顶峰，此后随着雨水输入量的减少而减少。在最高碳氢化合物浓度的深度区间内，总有机碳的放射性碳特征（△14 {sup left} C，‰）减少（“年龄”增加）。 2000年核心的石墨黑碳的历史特征类似于多环芳烃；但是，在西雅图成立之前沉积的高背景沉积物表明该流域中的风化是相当大的非工业成分。与碳氢化合物污染不同，在整个20世纪后期，陆生有机质（由长链脂肪醇追踪）的输入量有所增加，这证明了污染物源已从碳氢化合物转移到该地区土壤的人为侵蚀。

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《Environmental Science & Technology》 |2004年第2期|p.431-439|共9页
作者
STUART G. WAKEHAM; JAMES FORREST; CAROLINE A. MASIELLO; YVES GELINAS; CLARK R. ALEXANDER; PETER R. LEAVITT;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类环境化学;
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Hydrocarbons in Lake Washington Sediments. A 25-Year Retrospective in an Urban Lake

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