重金属的胶体促使运移行为促进了重金属在更大范围土壤-地下水污染扩散。目前溶解态重金属的胶体促使运移研究受到关注，而来源于采矿、冶金等工业生产的粉尘扬尘中难溶态重金属矿物细或超细颗粒的胶体促使运移研究则缺乏。本课题首先利用扫描电镜、X射线衍射和X射线光电子能谱等仪器分析和滴定等化学分析方法系统研究胶体与难溶重金属矿物颗粒相互作用；然后研究重金属矿物细或超细颗粒在石英砂均质介质中的胶体促使运移规律以及pH、溶解性有机质、流速和离子强度等对运移的影响机制；进而研究难溶重金属矿物细或超细颗粒在土壤中的胶体促使运移规律及关键要素；最终建立土壤中难溶重金属矿物细或超细颗粒的胶体促使运移数学模型。该研究阐明土壤中难溶重金属矿物细或超细颗粒的胶体促使运移规律和关键影响因素，揭示来源于冶金化工、采矿尾矿等释放重金属矿物颗粒在土壤及地下水扩散行为和机理，为重金属污染的防治提供科学参考。

It is believed that colloid-facilitated transport of heavy metals is an important diffuse route for heavy metals in soil and groundwater, which may cause a wider diffusion of pollutants in the soil and groundwater. Now many researches focus on the colloid-facilitated transport of dissolved heavy metals in soils, while few studies have been carried on the colloid-facilitated transport of insoluble fine and ultrafine mineral particulates of heavy metals in dust and fly ash from the industry of mining, chemical industry and metallurgies. Therefore, the present study will be carried out. Firstly, the interaction between heavy metal mineral particles and soil colloids will be investigated by the combination of instrumental analysis such as transmission electron microscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy and chemical analysis such as titration analysis. Secondly, the colloid-facilitated transport of dissolved heavy metals and insoluble fine and ultrafine mineral particulates of heavy metals in quartz-sand column will be compared and the role of ionic strength, flow rate, pH, and soluble organic matter also be investigated. Thirdly, the colloid-facilitated transport of dissolved heavy metals and insoluble fine and ultrafine mineral particulates of heavy metals in soil column will be investigated and the role of ionic strength, flow rate, pH, and soluble organic matter also be compared. Finally, the mathematical model of the colloid-facilitated transport of insoluble fine and ultrafine mineral particulates of heavy metals in soil will be established. The present study aims to clarify the colloid-facilitated transport of insoluble fine and ultrafine mineral particulates of heavy metals in soil and the role of ionic strength, flow rate, pH, and soluble organic matter. The present study will reveal the diffusion and retention of insoluble fine and ultra-fine mineral particles of heavy metals from the industry of mining, chemical industry and metallurgies in soil and groundwater. It improves the scientific understanding for the remediation of soil contaminated with heavy metals.