State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Environ Pollut. 2012 Nov;170:177-82. doi: 10.1016/j.envpol.2012.07.003. Epub 2012 Jul 24.
Sequestration and diffusion of three polycyclic aromatic hydrocarbons (PAHs) in seven Chinese soils were investigated for up to 200 days in sterile soil microcosms as functions of soil property and aging time. The aging of the PAHs, assessed using a mild extractant that removes primarily the labile fraction, showed a biphasic behavior. The rapid diffusion from labile to nonlabile domains was mainly dependent upon the distribution of meso- and micropore fraction and total organic carbon content. Meanwhile, the slow diffusion was found to decrease with the increase of the content of soil organic carbon, particularly of hard organic carbon (p < 0.01) and the meso- and micropore fraction, as well as with the increasing molecular size of PAHs. This work offers evidence that analyses of organic carbon fractionation and porosity are important to adequately assess the mechanistic basis of sequestration and diffusion of organic contaminants in soils.
采用温和提取剂（主要去除不稳定部分）评估多环芳烃（PAHs）老化，发现老化呈两相行为。快速从不稳定向稳定域扩散主要取决于中孔和微孔部分以及总有机碳含量的分布。同时，发现缓慢扩散随土壤有机碳含量增加而降低，尤其是硬有机碳（p<0.01）和中孔、微孔部分，以及 PAHs 分子尺寸增大而降低。这项工作提供了证据，表明有机碳分级和孔隙率分析对于充分评估土壤中有机污染物的固持和扩散的机理基础很重要。
