Polycyclic Aromatic Hydrocarbon (PAH) and Oxygenated PAH (OPAH) Air鈥揥ater Exchange during the Deepwater Horizon Oil Spill

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• 作者：Lane G. Tidwell ; Sarah E. Allan ; Steven G. O鈥機onnell ; Kevin A. Hobbie ; Brian W. Smith ; Kim A. Anderson
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：January 6, 2015
• 年：2015
• 卷：49
• 期：1
• 页码：141-149
• 全文大小：559K
• ISSN：1520-5851

文摘

Passive sampling devices were used to measure air vapor and water dissolved phase concentrations of 33 polycyclic aromatic hydrocarbons (PAHs) and 22 oxygenated PAHs (OPAHs) at four Gulf of Mexico coastal sites prior to, during, and after shoreline oiling from the Deepwater Horizon oil spill (DWH). Measurements were taken at each site over a 13 month period, and flux across the water鈥揳ir boundary was determined. This is the first report of vapor phase and flux of both PAHs and OPAHs during the DWH. Vapor phase sum PAH and OPAH concentrations ranged between 1 and 24 ng/m³ and 0.3 and 27 ng/m³, respectively. PAH and OPAH concentrations in air exhibited different spatial and temporal trends than in water, and air鈥搘ater flux of 13 individual PAHs were strongly associated with the DWH incident. The largest PAH volatilizations occurred at the sites in Alabama and Mississippi in the summer, each nominally 10鈥?00 ng/m²/day. Acenaphthene was the PAH with the highest observed volatilization rate of 6800 ng/m²/day in September 2010. This work represents additional evidence of the DWH incident contributing to air contamination, and provides one of the first quantitative air鈥搘ater chemical flux determinations with passive sampling technology.