Mixing states and secondary formation processes of organic nitrogen-containing single particles in Guangzhou,China  

作　　者：Lijun Yun Chunlei Cheng Suxia Yang Zaihua Wang Mei Li Qi En Zhong LiyuanMao Sulin Liu Xiaoya Cheng Duanying Chen Fan Yang Zhen Zhou 

机构地区：[1]Institute of Mass Spectrometry and Atmospheric Environment,Guangdong Provincial Engineering Research Center for on-line source apportionment system of air pollution,Jinan University,Guangzhou 510632,China [2]Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Guangzhou 510632,China [3]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy Science,Xi’an 710061,China [4]Institute for Environment and Climate Research,Jinan University,Guangzhou 510632,China [5]Guangdong Academy of Sciences,Institute of Resources Utilization and Rare Earth Development,Guangzhou 510650,China [6]Environmental Monitoring Station of Pudong New District,Shanghai 201200,China

出　　处：《Journal of Environmental Sciences》2024年第4期62-73,共12页环境科学学报（英文版）

基　　金：supported by the Key-Area Research and Development Program of Guangdong Province(No.2020B1111360001);the National Natural Science Foundation of China(Nos.41805093 and 41827804);the Natural Science Foundation of Guangdong Province(No.2021A1515011206);the GDAS’Project of Science and Technology Development(No.2021GDASYL-20210103058);the State Key Laboratory of Organic Geochemistry(No.SKLOG202105);Guangdong Foundation for Program of Science and Technology Research(No.2020B1212060053);the State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS(No.SKLLQG2218);Guangdong Basic and Applied Basic Research Foundation(No.2022A1515012165);Scientific research special project of Pudong new district Ecological and Environmental Bureau(No.PDHJ20210008);the Shanghai Municipal Science and Technology Commission Natural Fund(No.20ZR1449700)。

摘　　要：Organic nitrogen(ON)compounds play a significant role in the light absorption of brown carbon and the formation of organic aerosols,however,the mixing state,secondary formation processes,and influencing factors of ON compounds are still unclear.This paper reports on the mixing state of ON-containing particles based on measurements obtained using a highperformance single particle aerosol mass spectrometer in January 2020 in Guangzhou.The ON-containing particles accounted for 21% of the total detected single particles,and the particle count and number fraction of the ON-containing particles were two times higher at night than during the day.The prominent increase in the content of ON-containing particles with the enhancement of NO_xmainly occurred at night,and accompanied by high relative humidity and nitrate,which were associated with heterogeneous reactions between organics and gaseous NO_(x)and/or NO_(3)radical.The synchronous decreases in ON-containing particles and the mass absorption coefficient of water-soluble extracts at 365 nm in the afternoon may be associated with photo-bleaching of the ON species in the particles.In addition,the positive matrix factorization analysis found five factors dominated the formation processes of ON particles,and the nitrate factor(33%)mainly contributed to the production of ON particles at night.The results of this study provide unique insights into the mixing states and secondary formation processes of the ON-containing particles.

关 键 词：Organic nitrogen compounds Single particles Mixing state Secondary formation Nighttime chemistry 

分 类 号：X513[环境科学与工程—环境工程]