不同磷浓度对膨润土处理土壤吸附Cd^(2+)特性的影响  

Cd^(2+) sorption characteristics of soil treated by bentonite under different P levels

作　　者：金美玉[1] 李博文[1] 谢建治[1] 杨华[1] 王树涛[1] 

机构地区：[1]河北农业大学资源与环境学院,河北保定071001

出　　处：《河北农业大学学报》2007年第2期70-73,共4页Journal of Hebei Agricultural University

基　　金：河北省自然科学基金项目(302340)

摘　　要：通过等温吸附试验,研究了P对膨润土处理土壤吸附Cd2+的影响规律。结果表明:在该试验条件下,用Freundlich方程能很好地拟合出土壤对Cd2+的吸附等温线,其相关系数r2达到了0.970以上;P对膨润土处理土壤吸附Cd2+的影响,存在正效应和负效应,并且以负效应为主;P为高浓度时,吸附常数k值明显减小,土壤对Cd2+的吸附受抑制。因此,利用膨润土治理Cd2+污染的土壤时,还应考虑P等土壤中其他成分对Cd2+的有效性的影响。Cd^2＋ sorption reaction in the soil treated by bentonite under different phosphorus （P） levels was investigated. Cd^2＋ sorption conformed the Freundlich adsorption isotherm very well. The correlation coefficient r^2 reached 0.970. There were negtive and positive effect on Cd^2＋ sorption in soil under different phosphorus levels, whereas the negative one is dominating. The k decreased significantly at higher phosphorus concentration, that was to say the adsorption of Cd^2＋ was restrained. As a result, when remediating the soil contamination of Cd^2＋ by bentonite, we should consider nutrient element for plant such as phosphorus affect the validity of Cd^2＋ in soil.

关 键 词：膨润土 P CD 吸附反应 

分 类 号：X53[环境科学与工程—环境工程]