【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。更多还原

【Abstract】 Cd2+ sorption reaction in the soil treated by bentonite under different phosphorus(P) levels was investigated.Cd2+ sorption conformed the Freundlich adsorption isotherm very well.The correlation coefficient r2 reached 0.970.There were negtive and positive effect on Cd2+ 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 Cd2+ was restrained.As a result,when remediating the soil contamination of Cd2+ by bentonite,we should consider nutrient element for plant such as phosphorus affect the validity of Cd2+ in soil.更多还原