| 用质量作用模型描述重金属离子在土壤中的吸附特点 |
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| 引用本文： | 周代华,李学垣,徐凤琳,董元彦.用质量作用模型描述重金属离子在土壤中的吸附特点[J].环境科学学报,1996,16(4):425-430. |
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| 作者姓名： | 周代华 李学垣 徐凤琳 董元彦 |
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| 作者单位： | 结中农业大学土化系 |
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| 基金项目： | 国家自然科学基金,中国科学院南京土壤研究所土壤圈物质循环开放实验室资助 |
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| 摘 要： | 根据表面化学反应平衡原理，推导出了一个描述液－固吸附的质量作用模型：ｑ＝ｎ·Ｋα·Ｍ·Ｃ＾ｎ／１＋ＫａＣ＾ｎ。上式兼有Ｌａｎｇｍｕｉｒ、Ｆｒｅｕｎｄｌｉｃｈ方程的特性。Ｋａ是吸附反应的平衡常数；ｎ与覆盖一个表面活性点位的吸附质分子或离子数有关，可用于判断反应机理，并在一定程度上可表示反应的强度；Ｍ则是吸附剂表面的活性点位的总数；吸附容量由Ｍ和ｎ共同决定。将该模型应用于土壤体系，上述参数较好地解释了
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| 关 键 词： | 土壤 吸附 重金属 质量作用模型 |
| 收稿时间： | 1995/4/17 0:00:00 |
APPLICATION OF MASS-ACTION MODEL FOR DESCRIBING THE ABSORPTION CHARACTERISTICS OF HEAVY METALS ON SOILS |
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| Zhou daihu,Li Xueyuan,Xu Fenglin and Dong Yuanyan.APPLICATION OF MASS-ACTION MODEL FOR DESCRIBING THE ABSORPTION CHARACTERISTICS OF HEAVY METALS ON SOILS[J].Acta Scientiae Circumstantiae,1996,16(4):425-430. |
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| Authors: | Zhou daihu Li Xueyuan Xu Fenglin and Dong Yuanyan |
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| Institution: | Department of Soil and Agrichemical, Huazhong Agriculture University, Wuhan 430070,Department of Soil and Agrichemical, Huazhong Agriculture University, Wuhan 430070,Department of Soil and Agrichemical, Huazhong Agriculture University, Wuhan 430070 and Department of Soil and Agrichemical, Huazhong Agriculture University, Wuhan 430070 |
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| Abstract: | A mass-action model used to describe adsorption at the solid/solution interface was derived from the surface chemical reaction and equilibrium principles:The model has the characteristics of both langmiur and Freundlich equations. Ka is equilibrium constant of adsorption reaction and could be regarded as the intensive index of the adsorption; n indicates the number of adsorbed molecules or ions covering each active site on the surface , it is helpful to decide the mechanism of reaction; M is refereed to as the sum total of active sites on the surface of adsorbent; the adsorption capacity is determined by both M and n concurrently.The model was applied to the adsorption of Cu and Zn on red soil,Yellow-brown soil and grey chao soil. |
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| Keywords: | adsorption heavy metals mass-action model soils |
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