Impact of soil organic matter on the distribution of polycyclic aromatic hydrocarbons (PAHs) in soils.
Impact of soil organic matter on the distribution of polycyclic aromatic hydrocarbons (PAHs) in soils.
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DOI：
10.1016/j.envpol.2010.02.019
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发表时间：
2010-06
影响因子：
8.9
通讯作者：
Yu Yang;Na Zhang;M. Xue;S. Tao
中科院分区：
文献类型：
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作者：
Yu Yang;Na Zhang;M. Xue;S. Tao
了解疏水性有机污染物在土壤中的分布可以更好地了解它们在环境中的去向。采用正丁醇提取和腐植酸分级法研究了SOM对多环芳烃(PAHs)分布的影响。结果表明，80.5%~94.8%的目标多环芳烃可被正丁醇提取，63.1%~94.6%的多环芳烃与黄腐酸(FA)有关。未提取组分的PAHs浓度随土壤有机质(SOM)的增加而显著增加，而可提取组分则没有这种关联。结果表明，土壤中多环芳烃的积累与土壤中多环芳烃的截留密切相关。SOM还延缓了多环芳烃向胡敏组分的扩散。这表明土壤有机质中的固持对土壤中多环芳烃的分布起着至关重要的作用，而多环芳烃化合物的性质也对土壤中多环芳烃的分布有很大影响。
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.