重金属在土壤-地下水交互系统中的迁移特征

Migration Characteristics of Heavy Metals in Interaction System of Soil-Groundwater

用砂箱实验装置模拟地下水在水平流动情形下重金属在土壤-地下水(土-水)交互系统中的迁移特征.实验结果表明:4种重金属在不同深度土壤中的平均质量比为Cr>Ni>Co>Cu,土壤中垂向迁移能力为Cr>Ni≈Co>Cu;4种重金属在不同深度地下水中的平均质量浓度为Cu>Cr>Ni>Co,同一深度地下水平均质量浓度为Cu>Ni>Cr>Co;4种重金属在土-水交互系统中沿水流方向和垂直方向的迁移能力均为Cr≈Cu>Ni>Co;污染源在淋滤6h达最大释放量,此时地下水中的重金属质量浓度达最大值.

By using the sandbox experiment,we simulated migration characteristics of heavy metals in the interactive system of soil-groundwater under the condition of horizontal flow of groundwater.The experimental results show that average mass ratio of four heavy metals in different depths is Cr>Ni>Co>Cu,and the vertical migration capacity is Cr>Ni≈Co>Cu.The average mass concentration of four heavy metals in the different depths of groundwater is Cu>Cr>Ni>Co,and that in the same depth of groundwater is Cu>Ni>Cr>Co.The migration capacity of four heavy metals in the interaction system of soil-groundwater is Cr≈Cu>Ni>Co along the flow direction and vertical direction.The maximum release amount of the pollution source is leached for 6h,and then the mass concentration of heavy metal in groundwater reaches a maximum.