Nontarget Screening Of Organic Pollutants In Soil And Atmospheric Particulates Of Coking Plants

The pollution caused by industrial production in areas with rapid economic development poses a serious threat to the ecological environment,and increasing attention is paid to the prevention and control of soil pollution.The Beijing-Tianjin-Hebei region is a key area for the coking industry.The pollutants produced by the coking industry are mainly heavy metals and polycyclic aromatic hydrocarbons.This paper takes a coking plant in Hebei province as the research area,with soil and atmospheric particulate matter inside the plant as the research object.It conducts non-target analysis to characterize pollutants at the molecular level.The pollution levels of heavy metals in the soil at different locations are measured from different production levels.The 16 PAHs of atmospheric particulate matter in the coking plant area of the work section were analyzed,the source was analyzed,and the toxicity equivalent factor was used to assess occupational exposure.This research provides a basis for expanding the traditional PAH list,improving pollution control and risk assessment of pollutants.The main conclusions are as follows:(1)The heavy metals As,Cd,Cr,Cu,Ni,Pb,and Zn in the soil of the coking plant all exceeded the background value of the local soil environment;but except for Cr,the content of other heavy metals did not exceed the soil risk screening value of the construction land.It shows that there is a certain degree of pollution of heavy metals in the soil of the coking plant.(2)FT-ICR MS identified four heteroatom compounds as O₁,O₂,N₁ and S₁.At the molecular level,the relative abundances of CH and CHO in soil PACs of coking plant were higher,and the characteristics of atmospheric particulate matter were similar.The relative abundance of condensed PAHs with 4-8 aromatic rings is higher in soil and atmospheric particles.(3)The structures were verified by GC×GC-TOF MS including PAHs,APAHs,Oxy-PAHs,PAOHs,PAHs and PANHs.332 polycyclic aromatic compounds were identified in the soil of the coking plant,and 107 kinds of PACs with high recognition degree were identified in the soil,which could be further studied.(4)The average concentration of 16 PAHs was 63.08?g/m3.In coke oven,PAHs are mainly MMW PAHs,while in other sections,PAHs are mainly LMW PAHs.The main pollutants in atmospheric particulate matter are Ba P,Bb F and Bk F.We should focus on their supervision.The analysis of PAHs by characteristic ratio method shows that PAHs in atmospheric particulate matter mainly come from coal combustion and coking.Respiratory exposure assessment showed that different sections had the risk of lung cancer caused by respiration,but the high risk of lung cancer needs to be further confirmed.