Compositional fractionation of polycyclic aromatic hydrocarbons (PAHs) in mosses (Hypnum plumaeformae WILS.) from the northern slope of Nanling Mountains,South China |
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| Institution: | 1. State Key Laboratory of Geochemistry, Guangzhou Institute of Geochemistry, The Chinese Academy of Sciences, Guangzhou, China;2. Department of Environmental Sciences, Lancaster University, Lancaster LA1 4YQ, UK;3. Department of Civil and Structural Engineering, The Hong Kong Polytechnic University Hung Hom, Kowloon, Hong Kong;4. Faculty of Environmental Sciences, China Geosciences University (CUG), Wuhan, China;5. Post-graduate School of the Chinese Academy of Sciences, Beijing, China;1. Department of Life Sciences, King Fahd University of Petroleum and Minerals, Saudi Arabia;2. Department of Earth Sciences, King Fahd University of Petroleum and Minerals, Saudi Arabia;1. Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;2. Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, Jiangsu, China;2. School of Earth and Environmental Sciences, The University of Queensland, Australia;3. College of Geography and Environment, Shandong Normal University, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. Department of Earth Sciences, Sun Yat-Sen University, Guanghzou 510275, China;1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Key Laboratory of Coastal Wetland Biogeosciences, China Geologic Survey, Qingdao Institute of Marine Geology, CGS, Ministry of Land and Resources, Qingdao 266071, China;3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Dipartimento di Biologia, Università di Napoli Federico II, Via Cintia 4, 80126 Napoli, Italy;2. Dipartimento di Agraria, Università di Napoli Federico II, Via Università 100, 80055 Portici, NA, Italy;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China;2. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | High mountains may serve both as condenser for vapor phase persistent organic pollutants (POPs) and as barrier/sink for particulate associated less volatile POPs. The fractionation of POPs along altitudinal profiles is of interest in understanding the role of high mountains in the atmospheric transport of POPs. In the present study, polycyclic aromatic hydrocarbons (PAHs) in a selected moss species, Hypnum plumaeformae WILS, from two altitudinal profiles on the northern slope of Nanling mountains in Southern China were analyzed and compared with those in air samples. The total PAH concentration in the mosses was 310–1340 ng g−1 dry weight, with phenanthrene being the most abundant. The distribution patterns of PAHs in the moss samples matched well with those in bulk atmosphere deposition in the adjacent source areas. The PAH distribution pattern in the mosses was a composite of both particle-associated and vapor phase PAHs, with heavy PAHs are susceptible to uptake/retention by mosses than light PAHs. A plot of log (Cmoss/Cair) against log Koa gave a good linear relationship in the log Kao range of 6.7–10.2. It is suggested that the widely spread moss, H. plumaeformae WILS, can be used as an effective tool in the biomonitoring of atmospheric PAHs pollution in East Asia. The concentrations of most PAHs in the mosses generally declined with increasing altitude. In addition, there was a shift in compound pattern with an increase in the proportion of light PAHs (2–3 rings), a decrease in heavy PAHs (5–6 rings) and a relatively stable content of 4-ring PAHs. A combination of particulate scavenging and cold condensation are proposed as the major mechanisms for the compositional fractionation of PAHs along the altitudinal profile. |
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