| 镉在土水系统中的迁移特征 |
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| 引用本文： | 廖敏,谢正苗,黄昌勇.镉在土水系统中的迁移特征[J].土壤学报,1998,35(2):179-185. |
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| 作者姓名： | 廖敏 谢正苗 黄昌勇 |
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| 作者单位： | 浙江农业大学环境资源学院 |
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| 摘 要： | 本文研究了４种红壤和水体系中镉的迁移特征。结果表明：镉扩散系数Ｄｉ变化在５．７＊１０－８－９．３＊１０＾－７ｃｍ＾２／ｓｅｃ；通过比较单、双表面Ｌａｎｇｍｕｉｒ方程的参数，发现四个土壤的高能位吸附常数远远大于低能位吸附常数，
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| 关 键 词： | 镉 土壤 水体 迁移 吸附 解吸 |
| 收稿时间： | 1996/11/16 0:00:00 |
| 修稿时间： | 1997/10/8 0:00:00 |
TRANSPORT CHARACTERISTICS OF CADMIUM IN SOIL-WATER SYSTEM |
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| Liao Min,Xie Zheng-miao and Huang Chang-yong.TRANSPORT CHARACTERISTICS OF CADMIUM IN SOIL-WATER SYSTEM[J].Acta Pedologica Sinica,1998,35(2):179-185. |
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| Authors: | Liao Min Xie Zheng-miao and Huang Chang-yong |
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| Institution: | Zhejiang Asricultural University, Hangzhou 310029;Zhejiang Asricultural University, Hangzhou 310029;Zhejiang Asricultural University, Hangzhou 310029 |
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| Abstract: | Transport characteristics of cadmium in 4 soil-water systems were studied. The results showed that the diffusion coefficients of cadmium ranged from 5.6×10-8 to 9.3×10-7cm2/sec. Comparison between the parameters from the single and two-surface Langmuir equations demonstrated that the maximum adsorption capacity (b2)of low-energy sites was much greater than the maximum adsorption capacity (b1)of high-energy sites, resulting in high transportability of cadmium in the soil-water system. The variation of adsorption capacity of cadmium with pH had three distinct stages, i. e., low adsorption stage at pH6.0. The adsorption capacity of cadmium was positively correlated with pH at the stable adsorption stage. The bioavailability of adsorbed cadmium increased with increasing pH when pH<6 but decreased with increasing pH when pH<6. |
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| Keywords: | Adsorption Cadmium Desorption Soil Transport Water |
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