Molecular tracers of saturated and polycyclic aromatic hydrocarbon inputs into Central Park Lake, New York City.
Molecular tracers of saturated and polycyclic aromatic hydrocarbon inputs into Central Park Lake, New York City.
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DOI：
10.1021/es0506105
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发表时间：
2005-09
影响因子：
11.4
通讯作者：
Beizhan Yan;T. Abrajano;R. Bopp;D. Chaky;Lucille A. Benedict;S. Chillrud
中科院分区：
文献类型：
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作者：
Beizhan Yan;T. Abrajano;R. Bopp;D. Chaky;Lucille A. Benedict;S. Chillrud
对纽约中央公园湖沉积物岩心中的饱和烃（SH）和多环芳烃（PAHs）进行了定量分析。放射性核素210Pb和137Cs被用来确定岩心中每个部分的大致日期。基于210Pb的测年剖面与137Cs提供的时间约束吻合良好。放射性核素衍生的沉积日期与来自石油指示比U/R（脂肪馏分中未溶解的复杂混合物（UCM）与饱和碳氢化合物的比率）的时间信息以及纽约地区燃料使用历史的信息一致。1,7-二甲基菲蒽（DMP）与1,7-DMP + 2,6-DMP [1,7/(1,7 + 2,6)-DMP]、保留烯对保留烯加芘[Ret/(Ret + Chy)]和荧光蒽对荧光蒽加芘[FI/(FI + Py)]的比值在整个核心中提供了额外的来源区分。结果表明，U/R比对石油输入敏感，Ret/(Ret + Chy)对软木燃烧的贡献敏感，而FI/(FI + Py)和1,7/ (1,7 + 2,6)-DMP可用于区分木材，煤炭和石油燃烧源。综合使用这些比率表明，在纽约市，100年前木材燃烧占主导地位，从20世纪初到50年代转向煤炭燃烧。石油的使用始于20世纪20年代左右，自20世纪40年代以来一直占据主导地位。
Saturated hydrocarbons (SH) and polycyclic aromatic hydrocarbons (PAHs) have been quantified in a sediment core obtained from Central Park Lake, New York City. Radionuclides 210Pb and 137Cs were used to assign approximate dates to each individual section in the core. The dating profile based on 210Pb matches very well with the time constraints provided by 137Cs. Radionuclide-derived depositional dates are consistent with temporal information from the petroleum-indicator ratio U/R [the ratio of unresolved complex mixture (UCM)to saturated hydrocarbons in the aliphatic fraction] and the history of fuel use in the NYC area. Ratios of 1,7-dimethylphenanthrane (DMP) to 1,7-DMP plus 2,6-DMP [1,7/(1,7 + 2,6)-DMP], retene to retene plus chrysene [Ret/(Ret + Chy)], and fluoranthene to fluoranthene plus pyrene [FI/(FI + Py)] provide additional source discrimination throughoutthe core. Results show that the ratio U/R is sensitive to petroleum inputs and Ret/(Ret + Chy) is responsive to contributions from softwood combustion, whereas both FI/(FI + Py) and 1,7/ (1,7 + 2,6)-DMP can be used to discriminate among wood, coal, and petroleum combustion sources. Combined use of these ratios suggests that in New York City, wood combustion dominated 100 years ago, with a shift to coal combustion occurring from the 1900s to the 1950s. Petroleum use began around the 1920s and has dominated since the 1940s.