The Contribution Evaluation Of The Inorganic Precursors Discharged From Refinery Enterprises To Atmospheric Fine Particulate Matter

Atmospheric fine particles?also known as PM2.5?are defined as a relatively steady suspension system comprising by liquids or solids with aerosol diameter equal or less than 2.5 micrometres in evenly dispersed state.Since organic compounds and heavy metals are easily deposited on those particles,those substances are available to enter the blood through breathing activity and damage human health,thus for it has been widely concerned.Petrochemical enterprises emissions include sulphur dioxide,nitrogen dioxide,and ammonia,and those atmospheric pollutants are important inorganic precursors.Through establishing an assessment method of which estimates contributions of emissions from the enterprises to PM2.5,the present study analysed the products formation and their influences on PM2.5 based on air quality data collected from petrochemical enterprises?A,B,C?.Results present that atmospheric products of inorganic precursors surrounding A were NH₄HSO₄,?NH₄?₂SO₄,and Ca?NO₃?₂;the products surrounding B were NH₄HSO₄,KNO₃ and Mg?NO₃?₂;and the products surrounding C were Mg?NO₃?₂and NH₄HSO₄.Besides,the maximum contribution of precursors emitted from A,B,C for local PM2.5 was 3.40%,2.95%,and 0.27%respectively.The study reconstructed mass of PM2.5 around petrochemical enterprises through the analysis of atmospheric samples of emissions discharged,upwind and downwind side of the enterprises.Results show that identified chemical components of PM2.5discharged from fixed pollution sources of the enterprises account for 66.27%,63.69%and 74.38%respectively.Plant A contributed to its surrounding PM2.5 for OC;Plant B contributed to its surrounding PM2.5 for heavy metals,nitrates and ammonia;Plant C contributed little to its surrounding atmosphere.