Center for Water Research, College of Engineering, Peking University, Beijing 100871, China.
Environ Pollut. 2013 Nov;182:233-41. doi: 10.1016/j.envpol.2013.07.029. Epub 2013 Aug 9.
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.
多环芳烃（PAHs）通过地表径流从污染土壤中迁移，对水生生态系统构成重大风险。本研究基于降雨径流模拟实验，探讨了土壤中有机地球化学分析鉴定的碳质物质（CMs）对降雨条件下土壤结合态 PAHs 迁移的影响。该研究证实了土壤有机质组成显著影响 PAHs 富集和迁移的假设。土壤中含量、迁移性和吸附能力差异显著的 CMs 对 PAHs 的迁移有不同的作用。人为 CMs 如黑碳（BC）在很大程度上控制了 PAHs 的迁移，因为 PAHs 可能优先附着在它们上面。最终，本研究对传统的富集理论进行了重新思考。一个重要的启示是，土壤中的 CMs 必须被明确考虑，以适当地模拟 PAHs（可能还有其他疏水性化学物质）的非点源污染，并评估其环境风险。
