Journal
ENVIRONMENTAL POLLUTION
Volume 182, Issue -, Pages 233-241Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2013.07.029
Keywords
PAHs; Soil; Nonpoint source pollution; Black carbon; Organic petrology
Categories
Funding
- National Natural Science Foundation of China (NSFC) [91125021]
- Key Technologies Research and Development Program of China [2012BAC03B02]
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Polycyclic Aromatic Hydrocarbons (PAHs) transported from contaminated soils by surface runoff pose significant risk for aquatic ecosystems. Based on a rainfall-runoff simulation experiment, this study investigated the impact of carbonaceous materials (CMs) in soil, identified by organic petrology analysis, on the transport of soil-bound PAHs under rainfall conditions. The hypothesis that composition of soil organic matter significantly impacts the enrichment and transport of PAHs was proved. CMs in soil, varying significantly in content, mobility and adsorption capacity, act differently on the transport of PAHs. Anthropogenic CMs like black carbon (BC) largely control the transport, as PAHs may be preferentially attached to them. Eventually, this study led to a rethink of the traditional enrichment theory. An important implication is that CMs in soil have to be explicitly considered to appropriately model the nonpoint source pollution of PAHs (possibly other hydrophobic chemicals as well) and assess its environmental risk. (C) 2013 Elsevier Ltd. All rights reserved.
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