中文摘要：

重金属的环境行为与其在沉积物上的吸附状况密切相关,沉水植物对沉积物的重金属吸附性能有何影响值得关注。以武汉南湖沉积物为研究对象,对种植沉水植物菹草后沉积物的锌吸附性能变化开展研究,并将沉积物进行逐级分离,分析不同级的沉积物对锌吸附特性的作用。结果表明,Langmuir和Freundlich吸附等温式均能拟合沉积物对锌的吸附过程,前者拟合效果优于后者。Langmuir吸附等温式的拟合发现,未种菹草的沉积物与种植菹草后各级沉积物样对锌的最大吸附量很接近,但对锌的吸附亲和力却有差异,种植菹草后降低了沉积物对锌的吸附亲和力。通过Langmuir、Freundlich吸附等温式和ΔG0的计算可一致反映出不同级沉积物的吸附状况,种植菹草后沉积物经去除碳酸盐的S2＋3＋4的吸附能力比未种菹草的沉积物明显降低,而菹草并未明显改变其他处理的沉积物。

英文摘要：

Environmental impact of metals depends on its sorption ability,and role of submerged plant on the adsorption of heavy metals on sediments is of great importance.Zinc adsorption on natural sediment of Lake Nanhu in Wuhan was studied,and effect of Potamogeton crispus on the adsorption of sediments was investigated.The adsorption characteristics of different components in sediments were also discussed in order to understand the adsorption of heavy metals better.It showed that both Langmuir model and Freundlich adsorption model could be used to describe the equilibrium between adsorbed zinc ions and zinc ions in solution,and fitting results of the former was better than the latter.The data of Langmuir model showed that the maximum adsorption capacity of sediments with Potamogeton crispus and without Potamogeton crispus was similar,while the affinity of adsorption of sediments with Potamogeton crispus was lower.The adsorption ability of sediments with different treatments could be reflected by ΔG0,Langmuir and Freundlich adsorption models,the existence of Potamogeton crispus could reduce the ability of sediment sample,which was only removed carbonate.However there was no significant difference in the other treatments.