| 镉在土壤中吸持的动力学特征研究 |
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| 引用本文： | 张增强,张一平,朱兆华.镉在土壤中吸持的动力学特征研究[J].环境科学学报,2000,20(3):370-375. |
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| 作者姓名： | 张增强 张一平 朱兆华 |
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| 作者单位： | 西北农林科技大学基础科学系!陕西.杨凌712100(张增强)，西北农业大学资源与环境科学系(张一平)，华南农业大学资源与环境学院(朱兆华) |
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| 摘 要： | 采用间歇法研究了镉在不同土壤中吸持的动力学特征。镉在土壤中的吸持分为快速反应的慢速反应两个阶段，其中快速吸持阶段以化学吸持为主，而慢速吸持以物理吸附为主；在低温下（２９３Ｋ），镉吸持速率与时间符合方程１ｎＶ＝Ａ＋Ｂｔ，高温下３１３Ｋ）为Ｖ＝Ａ＋Ｂ１ｎｔ；不同类型土壤镉吸持的动力学模型以双常数模型较优。
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| 关 键 词： | 镉 吸附 动力学 间歇法 土壤监测 |
| 收稿时间： | 2/1/1999 12:00:00 AM |
| 修稿时间： | 1999-02-01 |
Study on the characteristics of kinetic of cadmium retention on soils |
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| ZAHNG Zengqiang,ZHANG Yiping and ZHU Zhaohua.Study on the characteristics of kinetic of cadmium retention on soils[J].Acta Scientiae Circumstantiae,2000,20(3):370-375. |
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| Authors: | ZAHNG Zengqiang ZHANG Yiping and ZHU Zhaohua |
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| Institution: | Department of Basic Science, Northw est Agricultural forest technological University Yangling, Shaanxi 712100,Department of Resources and Environment Science, Northw est Agricultural University and Colege of Resources and Environm ent Science, South China Agricultural University Guangzhou 510642 |
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| Abstract: | Kinetic characteristics of cadmium retention by different soils were studied using the batch techniques. Cadmium is adsorbed by the soils at different rates. According to the rate, the reaction of retention can be divided into two types: fast and slow. For the fast reaction, the chemical adsorption is the main adsorption, for the slow one, the physical adsorption is the main adsorption. At low temperature (293K), cadmium retention rate and the time accord with the model ln V=A Bt, at high temperature (313K), V=A B ln t model is the best one. For the different soils, the optimum model of cadmium retention is the two constants model. |
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| Keywords: | cadmium soil retention/adsorption kinetics |
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