Xiong Wei, Ling Wan-ting, Gao Yan-zheng, Li Qiu-ling, Dai Jing-yu
College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Ying Yong Sheng Tai Xue Bao. 2007 Feb;18(2):431-5.
This paper studied the effects of exotic and native dissolved organic matter (DOM) on the phenanthrene adsorption by three soils differed in soil organic carbon content (foc). The exotic DOM came from decayed rice straw, while the native DOM was extracted from the test soils. In all cases, the adsorption of phenanthrene by treated soils could be well described with linear-type model, and there was a positive correlation between adsorption coefficient (Kd) and foc Compared with the control, the Kd value of test soils after native DOM removed was increased by 7. 08% -21. 4% , and the increment (deltaKd) was positively correlated with fo,, indicating that the presence of soil native DOM impeded the phenanthrene adsorption by soil. The effects of exotic DOM on phenanthrene adsorption had a close relation with its added concentration in soil-water system. Within the range of 0-106 mg DOC x L(-1) , the K, value increased first, and then decreased with the increase of added exotic DOM concentration. Lower concentrations of added exotic DOM promoted the phenanthrene adsorption by soil, while higher concentrations ( I> or =52 mg DOC x L(-1)) of it obviously impeded this adsorption. These effects of exotic and native DOM on soil phenanthrene adsorption were considered to be related to the association of phenanthrene with DOM in solution, and the ' cumulative adsorption effect' between soil solid and aqueous phases.
本文研究了外来和本地溶解有机物（DOM）对三种有机碳含量（foc）不同的土壤吸附菲的影响。外来DOM来自腐烂的稻草，而本地DOM则从测试土壤中提取。在所有情况下，处理后土壤对菲的吸附都能用线性模型很好地描述，吸附系数（Kd）与foc呈正相关。与对照相比，去除本地DOM后测试土壤的Kd值增加了7.08% - 21.4%，且增量（deltaKd）与foc呈正相关，这表明土壤中本地DOM的存在阻碍了土壤对菲的吸附。外来DOM对菲吸附的影响与其在土壤 - 水体系中的添加浓度密切相关。在0 - 106 mg DOC·L⁻¹范围内，Kd值先随外来DOM添加浓度的增加而升高，然后降低。较低浓度的外来DOM添加促进了土壤对菲的吸附，而较高浓度（I≥52 mg DOC·L⁻¹）则明显阻碍了这种吸附。外来和本地DOM对土壤菲吸附的这些影响被认为与溶液中菲与DOM的缔合以及土壤固相和水相之间的“累积吸附效应”有关。
