• 关键词：土壤  吸附  钴

• 基金项目：

• 蔡祖聪
• 中国科学院南京土壤研究所

• 刘铮
• 中国科学院南京土壤研究所

• 摘要：对我国几种土类对钴吸附的研究表明,在平衡钴浓度不很高的条件下,土壤对钴的等温吸附表现为直线型,吸附量有明显的从南到北增加的趋势.通过修正竞争吸附方程对pH-钴吸附量曲线的描述,揭示出影响我国土壤对钴吸附容量的主要因素是粘土矿物类型,其次为土壤有机质及粘粒含量;随着土壤中铁锰氧化物的增加;其吸附强度增加.可变电荷高的土壤对钴吸附受pH的影响非常明显.永久电荷为主的土壤则不然.低的土壤pH可抑制铁锰氧化物对钴的强烈吸附.

• Abstract：Adsorption of cobalt on 9 soil samples from different areas of China was studied. The results suggested that the isotherms of cobalt adsorption on natural soils are linear and the amount of cobalt adsorbed increase from samples collected from north China to those from south. Modified competitive adsorption equations were well fitted the curves of pH-Co adsorption. The factor dominates the adsorption capacity is clay type, following by organic matter and clay content. Iron and manganese oxides dominate the adsorption intensity. The adsorption of cobalt on laterite and red earth from south China is highly sensitive to soil pH.

• Key words：soil  adsorption  cobalt.

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