Study on the formation mechanism and influencing factors of secondary inorganic ions in PM2.5 from typical cities in the Fenhe Plain in autumn and winter
The atmospheric PM2.5 samples were from 3 typical cities in the Fenhe Plain(Jinzhong,Taiyuan and Sanmenxia)during November 2020 to January 2021.The analysis results showed that the average concentration of PM2.5 in 3 typical cities in Fenhe Plain exceeded level 2 of the National Ambient Air Quality Standards.For each city,the WSIIs concentrations accounted for more than 37%of the PM2.5 and the SNA concentrations accounted for more than 78%of the WSIIs.SO42-and NO3-were mainly formed through heterogeneous oxidation in Sanmenxia and Jinzhong,while the formation of SO42-and NO3-in Taiyuan was accomplished by both gaseous phase and heterogeneous oxidation.The PM2.5 is alkaline in each city.The NH4+in Sanmenxia mainly existed in the form of NH4Cl,(NH4)2SO4 and NH4NO3.However,the NH4+in Jinzhong and Taiyuan mainly existed in the form of(NH4)2SO4 and NH4NO3.The main source of WSIIs in typical cities of Fenhe Plain was secondary source,followed by coal combustion sourc,mobile source and fugitive dust source,and biomass combustion source.
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