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• 环境科学 • 上一篇    下一篇

pH值和流速对向海盐碱湿地土壤草根层吸附铅、 镉规律的影响

李 鱼1, 张华鹏1, 王晓丽1, 李青山2 , 王 月1, 路永正1   

  1. 1. 吉林大学环境与资源学院环境科学系, 长春 130023; 2. 松辽流域水资源保护局, 长春 130021
  • 收稿日期:2004-05-08 修回日期:1900-01-01 出版日期:2004-10-26 发布日期:2004-10-26
  • 通讯作者: 李 鱼

Effects of pH and flow rate on the adsorption processes of Pb and Cd onto the soils sampled from the sod layers in Xianghai Wetland

LI Yu1, ZHANG Hua-peng1, WANG Xiao-li1, LI Qing -shan2, WANG Yue1, LU Yong-zheng1   

  1. 1. Department of Environmental Science, College of Environment and Resources, Jilin University, Changchun 130023, China; 2. Song-Liao River Basin Water Resources Protection Bureau, Changchun 130021, China
  • Received:2004-05-08 Revised:1900-01-01 Online:2004-10-26 Published:2004-10-26
  • Contact: LI Yu

摘要: 利用柱实验, 考察了向海盐碱湿地土壤草根层吸附Pb2+和Cd2+过程中的影响因素. 结果表明, 流速和pH值对动态吸附有很大影响, 流速加快, 穿透点提前, 穿透点吸附量减小; pH增加, 穿透点滞后, 穿透点吸附量增大; Pb2+与Cd2+在吸附过程中存在竞争吸附, Pb2+对Cd2+的吸附影响较大, 而Cd2+对Pb2+的吸附影响相对较小 . 不同pH值下, Pb2+和Cd2+的动态吸附过程均可用双常数速率方 程和Elovich方程描述, 且双常数速率方程更好.

关键词: 土壤草根层, pH值, 流速, 铅, 镉, 吸附

Abstract: The influences of flow rates and pH value on the adsorption of Pb and Cd by the sod layers from Xianghai Wetland were studied by the means of dynamic adsorption experiments. The results show that the penetrative point was advanced and the adsorbance at penetrative point was decreased with the increasing of the flow rates of the solution or the decreasing of pH value of the solution. When Pb2+ and Cd2+ coexisted with the initial equivalent concen tration, their retention by soil was reduced compared to those when they existed individually, and the reduced percentage of Cd2+ was greater than that of Pb2+. The dynamic adsorption procedures of Pb2+ and Cd2+ on the soils can be described via double-constant rate equation and Elovich equation and described better by t he former.

Key words: sod layer soil, pH value, flow rate, lead, cadmium, adsorption

中图分类号: 

  • X1313