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pH对湿地水环境中生物膜吸附铅和镉的影响

董德明, 李 鱼, 花修艺, 张菁菁, 杨 帆   

  1. 吉林大学环境与资源学院, 长春 130023
  • 收稿日期:2002-04-08 修回日期:1900-01-01 出版日期:2002-07-26 发布日期:2002-07-26
  • 通讯作者: 董德明

Effect of pH on Pb and Cd Adsorption to Surface Coatings Developed in the Aquatic Environment of Wetland

DONG De-ming, LI Yu, HUA Xiu-yi, ZHANG Jing-jing, YANG Fan   

  1. College of Environment and Resources, Jilin University, Changchun 130023, China
  • Received:2002-04-08 Revised:1900-01-01 Online:2002-07-26 Published:2002-07-26
  • Contact: DONG De-ming

摘要: 利用向海自然保护区一苇塘培养的生物膜在不同pH值条件下进行铅、 镉的吸附, 通过Fre undlich和Langmuir等温吸附曲线描述生物膜吸附铅、 镉的热力学过程. 实验结果表明, 不同pH条件下, 铅、 镉在湿地水环境中培养的生物膜吸附热力学数据均与Freundlich和 Langmuir等温吸附曲线显著性相关(n=5, p<0.01), 生物膜吸附铅的能力比吸附镉 的能 力约大一个数量级, 吸附溶液中的pH值与铅、 镉的最大吸附量呈正比, 并具有显著线 性关系.

关键词: pH, 湿地水环境, 生物膜, 铅, 镉, 吸附

Abstract: Pb and Cd adsorption on the surface coatings in the pH range from 4. 5 to 7.0, which were cultivated in a reed pond in Xianghai, was carried out. The data of Pb and Cd adsorption on the surface coatings fit both Freundlich and Langmuir isoth erms very well (n=5, p=0.01), and the maximum adsorption of Pb on the su rface co atings is one order of magnitude greater than that of Cd. Meanwhile, the maxim um adsorption of Pb and Cd on the surface coatings increases with increase of pH i n the solutions, showing significant linear correlation.

Key words: pH, aquatic environments in wetland, surface coatings, lead, cadmium, adsorption

中图分类号: 

  • X132