Pollution Characteristics And Risk Assessment Of Phthalates In Soils In Northeastern Shenyang City

In order to grasp the soil phthalate pollution in the urban-rural ecotone in the urbanization process,this paper takes the soil in the urban-rural ecotone in Dadong District,Shenyang City as the research object,According to different functions,it is divided into 3sampling areas of the EU Economic Development Zone,Industrial Life Comprehensive Zone and Automotive Industry Zone,Analyze the characteristics and sources of phthalate pollution in soils in different functional areas;Using the health risk model recommended by the US EPA to evaluate the health risk and ecological risk of phthalates in soil,Spatial analysis of phthalates in the soil of the urban-rural transition zone of Dadong District of Shenyang was performed using ArcGIS software,The results show:1.Cultivated land is distributed in the three sampling areas divided this time,and the proportion of cultivated land area is 70%,22.8%,and 17.6%,respectively.2.The contribution rates of phthalates in different types of soil are:Cultivated land is54.3%,industrial land is 43.7%,and residential land is 38.1%.The coefficient of variation of phthalates in the soil in the three sampling areas is between 10%and 100%,which is a medium variation,it shows that the urbanization process caused soil migration,and the phthalate content in the soil became higher and higher with the advancement from north to south.3.Dimethyl phthalate?DMP?and diethyl phthalate?DEP?,dibutyl phthalate?DBP?and di?2-ethylhexyl?phthalate?DEHP?,Butyl benzyl phthalate?BBP?and diethyl phthalate?DEP?,dibutyl phthalate?DBP?,di?2-ethylhexyl?phthalate?DEHP?,Dioctyl phthalate?DNOP?may have the same origin,DEP,DBP and DMP are the main pollutants in the soil of the urban-rural ecotone.4.Phthalates in the soil in the urban-rural ecotone of Dadong District have no non-carcinogenic health risks to the human body;The maximum value of adult DEHP carcinogenic risk index in the comprehensive industrial living area is 2.00×10^-6,the maximum value in the automobile industry area is 1.89×10^-6,which exceeds the prescribed standards and may cause carcinogenic risk to adults.5.The distribution of carcinogenic and non-carcinogenic risks in adults and children is spatially consistent,DMP and DNOP non-carcinogenic risks and areas with high carcinogenic risks appear in areas with densely distributed arable land;DEP,DBP and BBP non-carcinogenic risk and areas with high carcinogenic risk appear in areas with densely distributed residential land;DEHP's non-carcinogenic risk and areas with high carcinogenic risk appear in areas with densely distributed forest land.6.DMP,DEP,DBP,BBP,and DEHP,the ecological risk levels of these five phthalate monomer compounds are all less than 0.1,which is a first-level risk.This shows that the phthalates in the soil in the urban-rural ecotone of Dadong District do not pose ecological risks to humans.