磁性固体螯合材料对农田土壤中镉去除的影响因素

为了探究磁性固体螯合材料对农田土壤中Cd去除的影响因素，采用室内盆钵模拟方法，以湖北大冶某农田耕作土壤为实验土壤，MSC材料（magnetic solid chelator powder， 美索磁材料，一种磁性固体螯合材料，）为添加材料，研究了添加秸秆、风干土壤、搅拌时间、MSC材料活化及重复使用次数等因素对MSC材料去除Cd效果的影响。结果表明，土壤中秸秆会降低MSC材料对Cd的去除效果；土壤风干程度也会影响MSC材料对Cd去除效果，且其影响程度远高于秸秆的影响。当搅拌时间为40 min时，Cd去除效果最好，总Cd去除率为22.67%；随着搅拌时间的增加，MSC材料对Cd去除效果呈现先上升后下降的趋势。烘干的MSC材料通过水中浸泡12 h后的活化，可恢复对土壤中Cd的去除效果。MSC材料随着重复使用次数的增加，MSC材料对Cd去除效果呈现下降趋势，降低幅度逐渐减小。MSC材料能有效去除农田土壤Cd，去除效果受制于土壤性质、材料特性及操作工艺等因素，MSC材料应用于土壤修复领域研究具有重要现实意义。

Influences Factors of the Cadmium Removal by Magnetic Solid Chelator Powder(MSC) in Soil

Pot experiments were conducted for the purpose of analyzing the influencing effects for the magnetic solid chelator powder(MSC, magnetic solid chelator powder) on removal of cadmium pollution in the soil. The influencing factors included straws,air drying,activation structural material, stirring time and repetition times, etc. The results showed that the straw addition in the soil decreased the removal efficiency of Cd. The different air drying degree in the soil also had the effect of MSC. The air drying in the soil affected the results more by comparison with the straws. When stirring time was 40 min, the removal rate of Cd was 22.67% and achieved the best removal efficiency. With the increasing of stirring time, the effect of MSC on Cd removal increased first, then decreased. Drying MSC material lost the effect of Cd removal in the soil. After activation(soaking in water for 12 h), MSC material could remov Cd in the soil once again. MSC material had removal and remediation effects on soil Cd, the removal effects depended on soil properties, material properties and operation process and other factors. The research of MSC materials in soil remediation had important practical significance.