南海湖表层沉积物对Cd^(2+)的吸附-释放研究  

The Adsorption and Release of Cd^(2+) on the Surface Sediments of the Nanhai Lake of Baotou City

作　　者：孙英[1] 何江[1] 吕昌伟[1] 樊庆云[1] 宝金花[1] 

机构地区：[1]内蒙古大学生态与环境科学系,内蒙古呼和浩特010021

出　　处：《农业环境科学学报》2009年第6期1214-1218,共5页Journal of Agro-Environment Science

基　　金：国家自然科学基金(40363001)

摘　　要：通过吸附实验及释放实验,研究了包头市南海湖表层沉积物对Cd2+的吸附、释放作用。结果表明,Cd2+在南海湖沉积物上的吸附既符合Langmuir型又符合Freundlich型,且以Langmuir型为最佳;Cd2+的吸附对pH值依赖程度较高,随pH值的增高而增强;温度的降低,离子强度和泥沙浓度的增加,均不利于南海湖沉积物对Cd2+的吸附。在6h以内,Cd2+的释放百分率随时间的增加而增大,并于6h达到极值,6h后急剧下降,并在10h后趋于平稳;Cd2+的释放百分率随pH值的升高而降低。弱酸至碱性环境有利于Cd2+的吸附,酸性环境有利于Cd2+的释放。The Nanhai Lake （E 109°59′2″-110°2′26″, N 40°30′08″-40°33′32″） located in Nanhai wetland nature reserve in Baotou City of north China. This research mainly focuses on the adsorption and release of Cd^2＋ on the surface sediments of the Nanhai Lake. The results were described as follows：The Freundlich isotherm type model and Langmuir isotherm type model were used in this study, which were all fit the experimental equilibrium of Cd^2＋, and the Langmuir isotherm type model was better. In adsorption experiments, the adsorptive capacities of Cd^2＋ increased with pH and temperature, decreased with ionic strength and sediment concentration. While in release experiments, the release percentage of Cd^2＋ changes fluctuated during beginning 10 h, reached the maximum （9%） at 6 h, and smooth out after 10 h. Lower pH and acid condition were propitious to Cd^2＋ release.

关 键 词：Cd2+ 沉积物 吸附-释放 南海湖 

分 类 号：X524[环境科学与工程—环境工程]