Cadmium adsorption and desorption on humic acid, montmorillonite, goethite, kaolinite and calcareous clay

被引：0
|
作者：
Nakhone, LN [1 ]
机构：
[1] Egerton Univ, Dept Agron, Njoro, Kenya
来源：
DISCOVERY AND INNOVATION | 1997年 / 9卷 / 1-2期
关键词：
cation adsorption; desorption; desorption models; cadmium;
D O I：
暂无
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The adsorption-desorption characteristics of cadmium on soil components (humic acid, montmorillonite, goethite, kaolinite and calcareous clay) were investigated. Calcareous clay and humic acid sorbed by far the greatest amounts of cadmium though the adsorbents differed greatly in the ability to 'fix' cadmium irreversibly. It is considered that iron oxides and kaolinites contribute marginally to the sorption of cadmium by whole soils. The adsorption-desorption hysteresis was studied using two 'mechanistic' models. The order in which various adsorbents held cadmium irreversibly was: calcareous clay > montmorillonite > goethite > kaolinite > humic acid. An increase in pH increased the adsorption and 'fixation' of cadmium in montmorillonite.
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页码：53 / 71
页数：19
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