铜陵市土壤气环境地球化学特征

Environment Geochemical Characteristics of Soil Gas in Tongling City

该文对安徽铜陵市土壤气CO_(2)、Rn和Hg的浓度进行了测量,分析了该地区的土壤气浓度空间分布特征及其环境地球化学特征。结果表明:(1)铜陵市土壤气CO_(2)、Rn和Hg浓度的背景值分别为0.2%、4.5 kBq/m^(3)和7.7 ng/m^(3)。(2)研究区的土壤气浓度整体具有自西向东,自南向北增大的趋势。在研究区东北部分土壤气CO_(2)的浓度达到了低窒息风险,氡污染程度达到了中度,其主要污染源是山间盆地沉积物局部富集的铀元素;在研究区的人口密集区出现了土壤气汞浓度较大的中度污染区,其主要污染源是燃煤、船舶运输、生活垃圾以及矿区的固体废物排放。研究结果对铜陵市的城市建设规划与污染防治有参考价值与意义。

The concentrations of CO_(2),Rn and Hg in soil gas were measured in Tongling City,Anhui Province,and the spatial distribution characteristics of soil gas concentration and the environmental geochemical characteristics of this area were analyzed by using the geological accumulation index method.The results showed that:(1)The background values of CO_(2),Rn and Hg concentrations in soil gas in Tongling were 0.2%,4.5 kBq/m^(3)and 7.7 ng/m^(3),respectively.(2)The soil gas concentration in the study area increased from west to east and from south to north.In the northeastern part of the study area,the concentration of CO_(2)in the soil gas reached low asphyxiation risk,and the radon pollution degree reached moderate.The main pollution source was uranium locally enriched in the sediments of the intermountain basin.In the densely populated areas of the study area,moderate pollution areas with high concentration of soil gas and mercury appeared,and the main pollution sources were coal burning,ship transportation,household refuse and solid waste discharge from the mining area.The results of this study are of great significance to the urban construction planning and pollution prevention and control in Tongling City.