Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Environ Pollut. 2010 Jun;158(6):2170-4. doi: 10.1016/j.envpol.2010.02.019. Epub 2010 Mar 26.
The knowledge on the distribution of hydrophobic organic contaminants in soils can provide better understanding for their fate in the environment. In the present study, the n-butanol extraction and humic fractionation were applied to investigate the impact of SOM on the distribution of polycyclic aromatic hydrocarbons (PAHs). The results indicated that 80.5%-94.8% of the target PAHs could be extracted by n-butanol and 63.1%-94.6% of PAHs were associated with fulvic acid (FA). Concentrations of un-extracted PAHs increased significantly with the increasing soil organic matter (SOM), however, such an association was absent for the extractable fractions. The results suggested that the sequestration played a critical role in the accumulation of PAHs in soils. SOM also retarded the diffusion of PAHs into the humin fractions. It implied that sequestration in SOM was critical for PAH distribution in soils, while the properties of PAH compounds also had great influences.
土壤中疏水性有机污染物的分布知识可以更好地了解它们在环境中的归宿。在本研究中，采用正丁醇萃取和腐殖质分级法研究了土壤有机质（SOM）对多环芳烃（PAHs）分布的影响。结果表明，正丁醇可萃取 80.5%-94.8%的目标 PAHs，63.1%-94.6%的 PAHs 与富里酸（FA）结合。未提取 PAHs 的浓度随土壤有机质（SOM）的增加而显著增加，而可提取部分则不存在这种相关性。结果表明，在土壤中，PAHs 的积累主要是由于被土壤有机质（SOM）所固定。SOM 还阻碍了 PAHs 向胡敏素组分中的扩散。这意味着 SOM 中的固定作用对 PAH 在土壤中的分布至关重要，而 PAH 化合物的性质也有很大影响。
