GIS评估土壤中重金属锌、铜污染情况及钙浓度与pH值关系分析

GIS-based processing for the determination of heavy metal Zinc and Copper and analysis of the relationship between soil calcium and pH values

目的分析英国Houslow Heath地块重金属污染情况,评估土地重新使用可行性,并为小学选址提出可选地块。方法依据荷兰土壤及地下水导则对Houslow Heath的土壤、地下水和地表水中检测出的重金属锌和铜的浓度及分布地点进行评价,同时评估土壤中钙浓度与pH值的关系,并用地理信息系统(GIS)描绘出超标重金属污染的空间分布特征。根据检测结果评估Houslow Heath地块是否适合兴建一所小学,并为其选择兴建小学的最优地址。结果 Houslow Heath地块土壤中重金属铜和锌的含量均超过标准值;地表水和地下水中的重金属浓度符合荷兰管理条例的标准;通过GIS系统观测到土壤中钙的浓度随pH值的增加而增高;土壤样品和水样的误差均在允许范围内,结果准确可信。结论 Houslow Heath地块可以重新使用,其东南边为兴建小学最优地址。

Objective To analyze the feasibility of the reuse of heavy metal-contaminated land in Houslow Heath England and propose alternative sites for the selection of a primary school.Methods Using the Dutch soil and groundwater guidelines to measure the concentration and distribution of heavy metals Zinc and Copper in the soil,groundwater and surface water of Houslow Heath,and to detect the relationship between soil calcium and pH values,Geographic information system(GIS)was used to describe the spatial distribution characteristics of heavy metal pollution.By assessing heavy metal contamination of soil,surface water,and groundwater in the polluted land,to conduct Houslow Heath was suitable for the construction of a primary school or not,and chose a relatively reasonable address for it.Results The contents of heavy metals such as copper and zinc in the Houslow Heath soil exceeded the standard values;the concentration of heavy metals in surface water and groundwater met the Dutch regulations;the concentration of calcium observed by GIS system increased with increasing pH.Error analysis of soil samples and water samples were acceptable.Conclusion Houslow Heath was suitable for the construction of a primary school and chose a relatively reasonable address southeast corner for it.