Source Apportionment of Polycyclic Aromatic Hydrocarbons in Central European Soils with Compound-Specific Triple Isotopes (未13C, 螖14C, and 未2H)

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• 作者：Carme Bosch ; August Andersson ; Martin Krus氓 ; Cecilia Bandh ; Ivana Hovorkov谩 ; Jana Kl谩nov谩 ; Timothy D. J. Knowles ; Richard D. Pancost ; Richard P. Evershed ; 脰rjan Gustafsson
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：July 7, 2015
• 年：2015
• 卷：49
• 期：13
• 页码：7657-7665
• 全文大小：406K
• ISSN：1520-5851

文摘

This paper reports the first study applying a triple-isotope approach for source apportionment of polycyclic aromatic hydrocarbons (PAHs). The ¹³C/¹²C, ¹⁴C/¹²C, and ²H/¹H isotope ratios of PAHs were determined in forest soils from mountainous areas of the Czech Republic, European Union. Statistical modeling applying a Bayesian Markov chain Monte Carlo (MCMC) framework to the environmental triple isotope PAH data and an end-member PAH isotope database allowed comprehensive accounting of uncertainties and quantitative constraints on the PAH sources among biomass combustion, liquid fossil fuel combustion, and coal combustion at low and high temperatures. The results suggest that PAHs in this central European region had a clear predominance of coal combustion sources (75 卤 6%; uncertainties represent 1 SD), mainly coal pyrolysis at low temperature (鈭?50 掳C; 61 卤 8%). Combustion of liquid fossil fuels and biomass represented 16 卤 3 and 9 卤 3% of the total PAH burden (鈭慞AH₁₄), respectively. Although some soils were located close to potential PAH point sources, the source distribution was within a narrow range throughout the region. These observation-based top-down constraints on sources of environmental PAHs provide a reference for both improved bottom-up emission inventories and guidance for efforts to mitigate PAH emissions.