Distribution characteristics and source analysis of heavy metals from dry and wet atmospheric deposition in northern Xiushan County,Chongqing
This study aims to determine the contents of heavy metals from dry and wet atmospheric deposition in northern Xiushan County for targeted environmental pollution prevention and control and safe farmland soil utilization.Based on the dry and wet atmos-pheric deposition samples continuously received from 18 sampling sites in northern Xiushan County from November 2019 to November 2020,this study tested the contents of seven heavy metal elements,including Cd,Cr,Cu,Ni,Pb,Zn,and Hg.Considering the top-ographic features,this study analyzed the distribution patterns and sources of heavy metals from dry and wet atmospheric deposition in northern Xiushan County.Moreover,this study assessed the soil pollution caused by heavy metals from dry and wet atmospheric deposi-tion using the geoaccumulation index method.The results show that except Hg,the other six heavy metal elements exhibited significant zoning,with their high-value deposition areas distributed primarily in the flanks and eastern segment of Chuanhegai,where their con-tents were much higher than the national and Chongqing's averages.In contrast,their depositional fluxes in other general deposition ar-eas were less than the national averages by 25%.The high dry and wet atmospheric deposition in the flanks of Chuanhegai was subjec-ted to both the mining of the lead-zinc deposit in Huayuan County in the east and the special topography.The abrupt topography in-creased the fluxes of the seven heavy metals in the dry and wet atmospheric deposition by 49 times.Therefore,the monitoring and as-sessment of environmental safety in this type of landform area should be strengthened.According to the assessment results of the geoac-cumulation index method,the flanks of Chuanhegai were moderately-severely to extremely polluted by Cd,slightly-moderately polluted by Pb,and slightly-moderately to severely polluted by Zn.
dry and wet atmospheric depositionheavy metalsource analysisXiushan
万方数据
维普
