The Research Of Source Apportionment Of Jianghan District PM₁₀ And PM_2.5 In Autumn And Winter

JiangHan district is one of seven important part in WuHan city,which has a big pulation density,developed business and convenient traffic lines,but no heavy industry.The job of samples collection keep 4 months from from September to December 2016.The main research conclusions are as follows:?1?By moitoring the concentration of PM₁₀0 and PM_2.5 in HouXiangHe point and HouXiangHe point,we find that the concentration of PM₁₀ and PM_2.5.of two monitoring in9-12 months were gradually rising trend.The main aerosol pollution near HouXiangHe point is PM_2.5-10,and the main aerosol pollution near DaXingLu point is PM_2.5.?2?Through the detection and study of water soluble ion in particulate matter,We find that the concentration of Mg²⁺?Ca²⁺?Na⁺?K⁺?Cl^-in HouXiangHe point is higher than DaXingLu point,but the concentration of SO₄^2-?NO₃^-?NH₄⁺in DaXingLu point is higher.Water-soluble ions SO₄^2-?NH₄⁺?K⁺?NO₃^-mainly distributed in PM_2.5.5 and Cl^-?Ca²⁺mainly distributed in PM₁₀.The all value of NO₃^-/SO₄^2-is high,so the contribution rate of particles in the moving source?motor vehicle exhaust?is more than the contribution of fixed source?such as coal burning?.?3?Through the studyof the components of element in the particles,We find that the concentration of Pb?Cd?Zn?Sb?K?Mn?As?Ba?Sn?Vin two monitoring in 9-12months were gradually rising trend,this related to climatic conditions.Crustal elements are mainly distributed in the PM_2.5-10,and other metal elements such as Pb?Se?Cr?Cd?Zn?Mn?Sb?Sn?As are mainly distributed in the PM_2.5.The value of EF in DaXingLu point is higher than HouXiangHe point.?4?The result of using the CMB model to analysis the source of PM₁₀ and PM_2.5is:the contribution to PM₁₀ of urban fugitive dust,automobile tail gas dust,coal dust,secondary nitrates,secondary sulfate and other source is respectively 32%,22%,16%,11%,6%,13%;the contribution to PM_2.5 of automobile tail gas dust,coal dust,urban fugitive dust,secondary nitrates,secondary sulfate and other source is respectively28%,27%,13%,11%,9%,12%.