Molecular tracers of saturated and polycyclic aromatic hydrocarbon inputs into Central Park Lake, New York City

Publication Type  Journal Article
Year of Publication  2005
Authors  Yan, B. Z.; Abrajano, T. A.; Bopp, R. F.; Chaky, D. A.; Benedict, L. A.; Chillrud, S. N.
Journal Title  Environmental Science & Technology
Volume  39
Issue  18
Pages  7012-7019
Journal Date  Sep 15
ISBN Number  0013-936X
Accession Number  ISI:000231941700019
Key Words  fraser-river basin; depositional history; exhaust emissions; recent sediments; wood combustion; identification; coal; pah; 20th-century; components
Abstract  

Saturated hydrocarbons (SH) and polycyclic aromatic hydrocarbons (PAHs) have been quantified in a sediment core obtained from Central Park Lake, New York City. Radionuclides Pb-210 and Cs-137 were used to assign approximate dates to each individual section in the core. The dating profile based on Pb-210 matches very well with the time constraints provided by Cs-137. 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 [Fl/(Fl + Py)] provide additional source discrimination throughout the 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 Fl/(Fl + Py) and 1,7/ (13 + 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.

Notes  

965HRTimes Cited:8Cited References Count:33

URL  <Go to ISI>://000231941700019
DOI  Doi 10.1021/Es0506105