Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Environ Pollut. 2010 Feb;158(2):566-75. doi: 10.1016/j.envpol.2009.08.035. Epub 2009 Sep 25.
Fractions of soil organic matter in a natural soil were extracted and sorption (or binding) characteristics of phenanthrene on each fraction and to the whole sample were investigated. The organic carbon normalized single point sorption (or binding) coefficient followed lipid > humin (HM) > humic acid (HA) > fulvic acid (FA) > whole soil sample, while the nonlinear exponent exhibited lipid > FA > HA > whole soil sample > HM. FA showed nonlinear binding of phenanthrene as it often does with other fractions. HM and HA contributed the majority of organic carbon in the soil. The calculated sorption coefficients of the whole soil were about two times greater than the measured values at different equilibrium phenanthrene concentrations. As for phenanthrene, the sorption capacity and nonlinearity of the physically mixed HA-HM mixtures were stronger as compared to the chemically reconstituted HA-HM composite. This was attributed to (besides the conditioning effect of the organic solvents) interactions between HA and HM and acid-base additions during fractionation.
从自然土壤中提取土壤有机质的各个部分，并研究了各部分及整个样品对菲的吸附（或结合）特性。有机碳归一化单点吸附（或结合）系数依次为脂类＞腐殖质（HM）＞腐殖酸（HA）＞富里酸（FA）＞整个土壤样品，而非线性指数则为脂类＞FA＞HA＞整个土壤样品＞HM。FA 对菲表现出非线性结合，就像它对其他部分一样。HM 和 HA 是土壤中大部分有机碳的来源。在不同的平衡菲浓度下，计算得到的整个土壤的吸附系数大约是实测值的两倍。对于菲来说，与化学重组的 HA-HM 复合材料相比，物理混合的 HA-HM 混合物的吸附能力和非线性更强。这归因于（除了有机溶剂的调节作用外）在分馏过程中 HA 和 HM 之间的相互作用以及酸碱的添加。
