State Key Laboratory of Pollution Control and Resource Reuse/School of the Environment, Nanjing University, Jiangsu 210093, China.
Environ Pollut. 2010 Jan;158(1):319-24. doi: 10.1016/j.envpol.2009.06.036. Epub 2009 Jul 17.
The main objective of the present study was to assess the roles of various soil components in sorption of organic compounds differing in polarity. Removal of the whole soil organic matter decreased sorption by approximately 86% for nonpolar 1,3,5-trichlorobenzene (TCB), but only 34-54% for highly polar 1,3,5-trinitrobenzene (TNB); however, removal of the extractable humic/fulvic acids did not much affect sorption of the two sorbates. With normalization of solute hydrophobicity, TNB exhibits several orders of magnitude stronger sorption compared with TCB to maize burn residue (black carbon), extracted humic acid and Na(+)-saturated montmorillonite clay, suggesting specific sorptive interactions for TNB with the individual model soil components. It was proposed that sorption of TCB to the bulk soil was dominated by hydrophobic partition to the condensed, non-extractable fraction of organic matters (humin/kerogen and black carbon), while interactions with soil clay minerals were an important additional factor for sorption of TNB.
本研究的主要目的是评估不同极性有机化合物在土壤中吸附的各种土壤成分的作用。去除整个土壤有机质后，非极性的 1,3,5-三氯苯（TCB）的吸附量减少了约 86%，而高度极性的 1,3,5-三硝基苯（TNB）的吸附量仅减少了 34-54%；然而，去除可提取的腐殖酸/富里酸并没有对两种吸附质的吸附产生太大影响。用溶质疏水性归一化后，TNB 与 TCB 相比，对玉米燃烧残渣（黑碳）、提取的腐殖酸和 Na(+)-饱和蒙脱石粘土的吸附要强几个数量级，这表明 TNB 与单个模型土壤成分之间存在特定的吸附相互作用。有人提出，TCB 对土壤的吸附主要是通过疏水性分配到有机物质的浓缩、不可提取部分（腐殖质/干酪根和黑碳），而与土壤粘土矿物的相互作用是 TNB 吸附的一个重要附加因素。
