海河沉积物对菲的吸附解吸行为研究

采用北运河坝河断面、海河干流邓善沽断面及葛沽镇断面表层沉积物及南开花园土为吸附剂，以菲为吸附质进行一系列吸附动力学和吸附-解吸平衡实验研究。结果表明，菲在各颗粒物上的吸附动力学过程，在0-4h内基本可达吸附平衡，刚开始吸附速率很快,然后迅速降低,并逐渐稳定；菲在各颗粒物上的等温平衡吸附可用线性等温线方程及Freundlich方程较好的拟合；不同来源颗粒物对菲的吸附能力随颗粒物中有机质含量增加而增强；葛沽镇颗粒物经高温灼烧处理后,其吸附能力明显降低；各天然颗粒物及不同温度灼烧处理的颗粒物对菲的解吸行为存在不同程度的滞后，灼烧颗粒物的滞后性远远大于原颗粒物，颗粒物中的有机质组分及性质对菲的解吸滞后有重要影响

Adsorption-desorption behaviors of phenanthrene on sediments from the Haihe River

Surface sediments from three typical sampling sites of Haihe River and Beiyunhe River and surface soil of Nankai University Garden were collected as sorbents, and sorption-desorption behaviors of Phenanthrene onto/off the different particles were experimentally investigated. The sorption of phenanthrene reached equilibrium quickly with a high sorption rate at first and then a low sorption rate immediately thereafter. The sorption isotherm of phenanthrene could be well described by Linear equation and Freundlich equation. The sorption amount of phenanthrene onto particles was direct proportion to the content of organic matter in the particles. The sorption amount of phenanthrene by Geguzhen sediments which were burned at a high temperature was much lower than that by the original sediment. Desorption hysteresis of phenanthrene on different sample particles were different, the burned particles are more hysteretic than the natural particles. And the difference of composition, structure and properties of organic matters of particles were the main factors to affect desorption hysteresis behaviors.