摘要
将ＤｅＢｏｅｒ－Ｚｗｉｋｋｅｒ公式用于土壤体系，探讨了重金属铜在３种土壤上的吸附－解吸特征及磷酸根的影响，据此推算出３种土壤的吸附势Ｅ－ｏ。结果表明，灰潮土的铜吸附势（Ｅ－ｏ）＞黄棕壤＞红壤，与３种土壤吸铜量的大小顺序一致，解吸率的大小顺序则刚好相反。黄棕壤随吸磷量的增加，吸铜量递增，铜解吸率下降，低吸磷水平时，其吸附势Ｅ－ｏ增加，高吸磷水平时，Ｅ－ｏ降低，红壤随吸磷量的增加，Ｅ－ｏ增加；灰潮土则随吸磷量的增加，其吸附势Ｅ－ｏ、吸铜量递减，铜解吸率增加。表明磷吸附对３种土壤吸附铜的强度因子和容量因子都有一定程度的影响。将Ｌａｎｇｍｕｉｒ方程得到的最大吸附量Ｍ和ＤｅＢｏｅｒ－Ｚｗｉｋｋｅｒ方程得到的吸附势Ｅ－ｏ相结合，可望更好地描述土壤体系的吸附行为。
The paper studied the characteristics of copper adsorption-desorption on three soils and effects of phosphate sorbed. The present work also made attempts to apply De Boer-Zwikker equation to soil systems, the adsorption potential E_0 was estimated according to this equation, which could represent the soil adsorption strength, the results were excellent. The values of Eo from three soils followed the order:calcareous chao soil>yellow-brown soil>red soil,it conformed with the order of adsorption capacity of the three soils and was contrary to its desorption percentages. For yellow-brown soil, small quantity of phosphate sorbed resulted in the increasing of E_0 : while the amount of sorbed phosphate became higher, its Eo declined. With increasing of phosphate sorbed, the Eo of red soil increased, but that of calcareous chao soil decreased. It was showed that sorption of phosphate not only affected the intensity of soil copper adsorption, but also affected its adsorption capacity. A combination of adsorption maxima-M from Langmuir equation and Eo from De BOer-Zwikker equation,the adsorption behaviour of soil systmes could be described more well.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1995年第1期58-63,共6页
Journal of Huazhong Agricultural University
基金
国家自然科学基金
中科院南京土壤研究所土壤圈物质循环开放实验室资助
关键词
土壤吸附
铜吸附
方程
红壤
黄棕壤
灰潮土
soil adsorption: copper adsorption
De Boer-Zwikker equation
red soil
yellow brown soil,calcareous chao soil
