干旱区生活垃圾填埋场土壤重金属污染特征及生态风险评价OA

Taking the soils of domestic waste landfill sites in Yutian,Cele and Pishan counties in Hotan Prefecture of Xinjiang as the research object,the contents of six heavy metals were determined,and various evaluation methods were used to explore their contents,spatial distribution,pollution and ecological risks.The results showed that there was no significant difference between the average content of heavy metals in the study area and the background value of Xinjiang soil,indicating no obvious anthropogenic pollution.The spatial variability followed the order of Yutian>Cele>Pishan,which was related to the intensity of human activities.The study area was generally at a non-pollution level according to the evaluation of single factor pollution index,and only 4 sampling sites had slight pollution of a single heavy metal.The geo-accumulation index evaluation showed that there was no artificial accumulation pollution of heavy metals,with a slight accumulation trend of Cr and Ni at some points.The overall potential ecological risk was relatively low,with As and Ni being the main contributing factors.In conclusion,the soil environmental quality of the three study areas was satisfactory.In Yutian area,it was necessary to focus on preventing Pb pollution from traffic sources and adverse impacts caused by agricultural activities,and strengthen intensive monitoring of As and Ni elements simultaneously.For Cele and Pishan areas,regular monitoring based on soil background values should be implemented to guard against heavy metal accumulation trends.