Ecological And Health Risk Assessment Of Soil And Outdoor Dust Pollution In Typical Logistics Industrial Zones In Harbin

The rapid development of society and national economy is accompanied by certain urban environmental problems.Industrial production,transportation and human daily activities produce certain pollutants,which enter urban soil,dust,water bodies and atmosphere and damage urban ecological environment and then affect human health.In this paper,a typical logistics park in Harbin City was used as the research object,and based on the results of the actual research study,a total of 21 surface dust samples and 9soil samples were collected,and the characteristic ratio method and correlation analysis were used to study the possible sources of polycyclic aromatic hydrocarbons（PAHs）and heavy metals Cu,Zn,Pb,Cr,and Cd（Cu,Zn,Pb,Cr,and Cd）;five heavy metals were studied using the Nemero integrated pollution index method to determine their pollution levels,while the single pollution index method was used to analyze the pollution levels of PAHs;the ecological risk was evaluated by using the potential ecological risk evaluation method and the risk quotient method;meanwhile,the health risk assessment method was applied to the selected study area,aiming to provide a scientific basis for the management of heavy metals and PAHs pollution in dust and soil in the logistics park.Through this study,the following conclusions and insights were mainly obtained.（1）Analysis of heavy metal content showed that the average values of Cu,Zn,Pb,Cr and Cd in the surface dust of Xilong West,FAW,Container,Dinghe Logistics Park and the soil around Container and Dinghe Logistics Park exceeded the background values of Harbin City soil,and Cd exceeded the standard especially.（2）The mean range of∑16PAHs in dust and soil of Xi Long West,FAW,Container,Dinghe Logistics Park was 1025.50-1090.25μg·kg^-1.（3）Correlation source analysis showed that there was correlation between dust heavy metals（Cu-Zn,Zn-Cr,Zn-Cd,Pb-Cr,Cr-Cd）in different study areas,which may originate from vehicle exhaust,tire wear,and metal parts.There was no correlation between heavy metals in containers,tripods and logistics soils,and the sources may be more complex.（4）The characteristic ratio shows that PAHs in the selected study area mainly originate from incomplete combustion of coal,petroleum and biomass.（5）Pollution evaluation results show that:the surface dust of Xilong West specifically shows Cu,Zn,Pb,Cr,Cd heavy pollution;pollution level are V,FAW,Container,Dinghe Logistics and Xilong West have the same evaluation results.Container surface soil is specifically Cu,Zn,Pb,Cd heavy pollution;Cr moderate pollution;except for Cr forⅣlevel,other pollution levels are V level.Dinghe logistics park surface dust Cu,Zn,Pb,Cr,Cd heavy pollution;pollution level are V.The pollution of polycyclic aromatic hydrocarbons in each place is mainly medium and high pollution.（6）Ecological risk evaluation shows that:Xilong West,FAW,Container,Dinghe Logistics Park surface dust and soil Cu,Zn,Pb and Cr are mainly clean,low and medium pollution,and Cd are all high pollution.A number of heavy metals in the study area have high potential ecological hazard index RI values,all of which belong to very high risk hazard levels.Harbin Xilong West,FAW,Dinghe and Container Logistics Park 16 PAH monomers are all at medium risk,and∑16PAHs are at low risk in the range of 0-800.（7）Health risk evaluation:The non-carcinogenic heavy metals in dust and soil in the study area were all non-carcinogenic health risks for children and no non-carcinogenic health threats for adults.The carcinogenic heavy metals Cr and Cd have no carcinogenic risk for children and adults.Container logistics soil PAHs showed that children’s accidental ingestion was the main exposure pathway,and there were potential health and safety problems for children and no potential health and safety problems for adults.