Journal
ENVIRONMENTAL POLLUTION
Volume 184, Issue -, Pages 138-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.08.029
Keywords
Polycyclic aromatic hydrocarbons; Air-soil exchange; Tibetan Plateau
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Funding
- National Natural Science Foundation of China [41222010, 41071321, 41201489]
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There are limited data on polycyclic aromatic hydrocarbons (PAHs) in both the atmosphere and soil of the Tibetan Plateau (TP). Concentrations of PAHs were therefore measured in 13 XAD resin-based passive air samplers and 41 surface (0-5 cm) soil samples across the TP. The average concentration of atmospheric PAHs was 5.55 ng/m(3), which was lower than that reported for other background areas, but higher than the Arctic. Concentrations in the soils fell in a wide range from 5.54 to 389 ng/g, with an average of 59.9 ng/g. Elevation was found to play an important role in determining the spatial distribution of soil PAHs. The air-soil exchange state showed that the soils of the TP will likely remain as a sink for high molecular weight PAHs, but may become a potential secondary source for low molecular weight PAHs. (C) 2013 Elsevier Ltd. All rights reserved.
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