Screening Technology And Ecological Risk Assessment Of Soil Characteristic Pollutants In Key Industries

The screening and identification of characteristic pollutants in the soil of polluted sites is the basis for site pollution remediation.This study established a new screening method,from the whole process of industry production,through the collection of data,to the enterprise site for investigation and investigation and soil sample collection,combined with GC/QTOF-MS suspicious substance screening and non-targeted screening technology,screening out potential characteristic pollutants in contaminated soil.Select three typical key industries with a large number of enterprises in China:petroleum processing,coking and metal smelting,the corresponding list of characteristic pollutants is screened and established.Ecological risk assessment of heavy metals and polycyclic aromatic hydrocarbons was carried out using the corresponding method.1)Through the screening of characteristic pollutants in the whole process,a total of343 characteristic pollutants were screened out in the soil of the petroleum processing industry site.A total of 307 characteristic pollutants were screened out at the coking site.A total of 124 characteristic pollutants were screened out in the soil of the smelting industry site,mainly heavy metal pollutants.2)Total petroleum hydrocarbons and PAHs contamination were found to be the most severe in the petroleum processing sites.Coking sites are compound pollution,and the soil pollution level in chemical production workshops and coking workshops is the most serious.There are obvious sources of Zn,Pb and Cu contamination in the melting process and the casting electrolysis process in the metal smelting site.3)The results showed that total petroleum hydrocarbons and polycyclic aromatic hydrocarbons were the most heavily contaminated in the tank farms of oil sites.Two heavy metal elements of Cd and Hg and 16 parent polycyclic aromatic hydrocarbons in soils in the coking industry are at high ecological risk.Heavy metal pollutants in smelting sites are mainly Pb,Zn and Cd.Figure 16;Table 25;Reference 72...