镉在红壤中的吸附特征  

Adsorption characteristics of cadmium in red soils.

作　　者：廖敏[1] 谢正苗[1] 黄昌勇[1] 

机构地区：[1]浙江农业大学土地科学与应用化学系

出　　处：《浙江农业大学学报》1998年第2期199-202,共4页

基　　金：国家自然科学基金

摘　　要：作者研究了４种红壤中镉的吸附特征．结果表明：镉离子（Ｃｄ２＋）扩散系数Ｄｉ在５．６×１０－８～９．３×１０－７ｃｍ２／ｓ；比较单、双表面Ｌａｎｇｍｕｉｒ方程的参数，发现４种土壤的高能位的吸附常数远远大于低能位的吸附常数，高能位的最大吸附量ｂ１明显小于低能位的最大吸附量ｂ２，即Ｃｄ２＋被土壤吸附是以低能位为主，这导致在土水体系中的高度迁移性．Adsorption characteristics of cadmium in 4 red soils were studied. The results showed that the diffusion coefficients of cadmium ranged from 5.6×10 -8 to 9.3×10 -7 cm 2/s; comparison between the parameters from the single and two surface Langmuir equations demonstrated that the maximum adsorption capacity of low energy sites ( b 2 ) was much greater than that of high energy sites ( b 1 ),which may result in high transportability of cadmium in the soil water system。

关 键 词：土壤 镉 红壤 吸附 

分 类 号：S153.3[农业科学—土壤学]