Size-segregated ambient particulate matter(PM)samples were collected seasonally in sub-urban Nanjing of east China from 2016 to 2017 and chemically speciated.In both fine(＜2.1 pm,PM2.1)and coarse(＞2.1 pm,PM＞2.1)PM,organic carbon(OC)accounted for the highest fractions(26.9％±10.9％and 23.1％±9.35％)of all measured species,and NO3-lead in av-erage concentrations of water-soluble inorganic ions(WSIIs).The size distributions of mea-sured components were parameterized using geometric mean diameter(GMD).GMD values of NO3-,Cl-,OC,and PM for the whole size range varied from＜2.1 pm in winter to＞2.1μm in warm seasons,which was due to the fact that the size distributions of semi-volatile components(e.g.,NH4NO3,NH4Cl,and OC)had a dependency on the ambient temperature.Unlike OC,elemental carbon(EC),and elements,NH4+,NO3-,and SO42-exhibited an in-crease trend in GMD values with relative humidity,indicating that the hygroscopic growth might also play a role in driving seasonal changes of PM size distributions.Positive matrix factorization was performed using compositional data of fine and coarse particles,respec-tively.The secondary formation of inorganic salts contributing to the majority(＞70％)of fine PM and 20.2％±19.9％of speciated coarse PM.The remaining coarse PM content was attributed to a variety of dust sources.Considering that coarse and fine PM had comparable mass concentrations,more attention should be paid to local dust emissions in future air quality plans.

Mingjie Xie;Wei Feng;Shuyan He;Qin'geng Wang

Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,School of Environmental Science and Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China;State Key Laboratory of Pollution Control and Resources Reuse,School of the Environment,Nanjing University,Nanjing 210023,China

环境科学学报（英文版）

[1]Mingjie Xie;Wei Feng;Shuyan He;Qin'geng Wang-.Seasonal variations,temperature dependence,and sources of size-resolved PM components in Nanjing,east China)[J].环境科学学报（英文版）,2022(11):175-186

speciated

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