期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 473, 期 -, 页码 317-325出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2013.12.037
关键词
Argentina; Climatic conditions; Leaching; Polycyclic aromatic compounds (PACs); Soil properties
资金
- Swiss National Science Foundation [SNF 200021_131938/1]
- Deutsche Forschungsgemeinschaft [DFG Oe516/2-1]
We evaluated the effects of soil properties and climate on concentrations of parent and oxygenated polycyclic aromatic compounds (PAHs and OPAHs) and azaarenes (AZAs) in topsoil and subsoil at 20 sites along a 2100-km north (N)-south (S) transect in Argentina. The concentrations of Sigma 29PAHs, Sigma 150PAHs and Sigma 4AZAs ranged 2.4-38 ng g(-1), 0.05-124 ng g(-1) and not detected to 0.97 ng g(-1), respectively. With decreasing anthropogenic influence from N to S, low molecular weight PAHs increasingly dominated. The octanol-water partitioning coefficients correlated significantly with the subsoil to topsoil concentration ratios of most compounds suggesting leaching as the main transport process. Organic C concentrations correlated significantly with those of many compounds typical for atmosphere-soil partitioning. Lighter OPAHs were mainly detected in the S suggesting biological sources and heavier OPAHs in the N suggesting a closer association with parent-PAHs. Decreasing alkyl-naphthalene/naphthalene and 9,10-anthraquinone (9,10-ANQ)/anthracene ratios from N to S indicated that 9,10-ANQ might have originated from low-temperature combustion. (c) 2013 Elsevier B.V. All rights reserved.
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