| 湿地土壤草根层对铅、镉吸附与解吸的动力学研究 |
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| 引用本文： | 李鱼,王晓丽,董德明,王月,李青山.湿地土壤草根层对铅、镉吸附与解吸的动力学研究[J].湿地科学,2004,2(1):10-14. |
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| 作者姓名： | 李鱼 王晓丽 董德明 王月 李青山 |
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| 作者单位： | 1. 吉林大学环境与资源学院,吉林 长春 130023
2. 松辽流域水资源保护局,吉林 长春 130021 |
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| 基金项目： | 国家自然科学基金重点项目 (批准号 :5 0 13 90 2 0 )资助 |
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| 摘 要： | 利用柱实验对向海湿地土壤草根层吸附与解吸铅、镉的动力学特征进行了研究。结果表明，土壤草根层吸附镉的动力学过程符合Elovich吸附速率方程、双常数速率方程、抛物线扩散方程，吸附铅的动力学过程符合双常数速率方程、抛物线扩散方程，说明草根层吸附铅、镉的过程是一个反应速率和扩散因子综合控制的过程；实验条件下，Pb^2 、Cd^2 的吸附动力学特性较好，但解吸动力学特性很差。说明湿地土壤草根层对铅、镉均有较强的吸持能力，可阻挡重金属离子向深层土壤的迁移，减少了深层土壤中重金属的汇集。
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| 关 键 词： | 湿地 生态系统 土壤草根层 铅 镉 吸附性能 动力学 土壤 |
| 文章编号： | 1672-5948(2004)01-010-05 |
| 修稿时间： | 2003年11月18 |
Study on the Kinetic Adsorption and Desorption of Pb and Cd by the Sod Layers in soil from Xianghai Wetland |
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| LI Yu ,WANG Xiao-Li ,DONG De-Ming ,WANG Yue ,LI Qing-Shan.Study on the Kinetic Adsorption and Desorption of Pb and Cd by the Sod Layers in soil from Xianghai Wetland[J].Wetland Science,2004,2(1):10-14. |
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| Authors: | LI Yu WANG Xiao-Li DONG De-Ming WANG Yue LI Qing-Shan |
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| Institution: | LI Yu 1,WANG Xiao-Li 1,DONG De-Ming 1,WANG Yue 1,LI Qing-Shan 2 |
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| Abstract: | Kinetic adsorption and desorption of Pb and Cd in column by the soils, which were sampled from Xianghai Wetland, were investigated in this paper. The results indicated that the kinetic adsorption of Pb and Cd were described by Double-constant Rate Equation and Parabola Diffusion Equation, and the adsorption processes of both Pb and Cd were controlled by the reaction rate and diffusion factor. Under this experimental conditions, the performance of dynamic adsorption of Pb and Cd were better (the maximum adsorption was 21.696mg/g or 2.161mg/g for Pb and Cd when only Pb or Cd present; while with Cd present, the maximum adsorption of Pb or Cd was reduced to 17.434mg/g or 1.204mg/g), but not for the performance of dynamic desorption (the desorption rates of Pb were only 0.343% or 0.0334% when with Cd present or not; while the desorption rates were 3.580% or 0.830% for Cd when with Pb present or not), implying that the The sod layers of soil from had the filter function for metal pollutants, and could prevent the transferring of heavy metals to the soil of the deep layers and could reduce the collection of metals in the deep soil. |
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| Keywords: | sod layers Pb Cd kinetics adsorption and desorption in colume |
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