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《Geochimica》 2007-04
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Sedimentary records of atmospheric deposition of polycyclic aromatic hydrocarbons in a reservoir in Nanling Mountains, South China

LIU Guo-qing1,2, PENG Xian-zhi1, ZHANG Gan1, QI Shi-hua3, ZOU Shi-chun4 and LI Xiang-dong51. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Institute of Applied Nuclear Technology, School of Physics, Shenzhen University, Shenzhen 518060, China;3. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;4. School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510250, China;5. Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong, China  
High mountains may serve as barrier to atmospheric circulation. In this study, the vertical variations of polycyclic aromatic hydrocarbons (PAHs) were investigated in a sediment core collected from a reservoir in Nanling Mountains. In combining with 210Pb dating technique, the historical records of atmospheric deposition of PAHs in Nanling Mountains were reconstructed. The results indicated that the deposited PAHs were mainly low molecular weight compounds with phenanthrene being the most dominant. In the core profile (0-28 cm), ∑PAHs concen-trations ranged from 86-778 ng/g dry weight. Sedimentary PAHs concentration started to increase since the 1970s, there was a decrease in the late of the 1980s and the late of 1990s, respectively. And sharp increase of PAHs concentrations were observed since 2000. PAHs were undergoing compositional fraction process during atmospheric transportation, and sediments accumulated low molecular weight PAHs. Dry and wet deposition is the most important pathway for PAHs input to remote areas.
【Fund】: 国家自然科学基金(40202035)
【CateGory Index】: P593;P512.2
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