New particle formation(NPF)is the primary source of nanoparticles and contributes a large number of concentrations of cloud condensation nuclei.In recent years,field campaigns and laboratory experiments have been conducted to promote cognition of the mechanism for NPF and its following growth processes.The chemical composition measurement of nanoparticles could help deepen understanding of the initial step of particulate matter for-mation.In this work,we developed a nanoparticle chemical ionization mass spectrometer to measure nanoparticles'chemical compositions during their initial growth stage.Mean-while,a non-radioactive ion source was designed for aerosol charging and chemical ioniza-tion.Time of flight mass spectrometer coupled with integrated aerosol size selection and collection module would guarantee the picogram level detection limit and high-resolution ability to measure the matrix of ambient samples.The performance of this equipment was overall evaluated,including the transmission efficiency and collection efficiency of custom-built nano differential mobility analyzer,chemical ionization efficiency,and mass resolu-tion of the mass spectrometer.The high sensitivity measurement of ammonium sulfate and methylammonium sulfate aerosols with diameters ranging from 10 to 25 nm could guarantee the application of this instrument in the ambient measurement.

Weigang Wang;Yan Chen;Lei Li;Li Zhou;Xubing Du;Mingyuan Liu;Maofa Ge

State Key Laboratory for Structural Chemistry of Unstable and Stable Species,Beijing National Laboratory for Molecular Sciences(BNLMS),CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Mass Spectrometer and Atmospheric Environment,Jinan University,Guangzhou 510632,China;College of Architecture and Environment,Sichuan University,Chengdu 610065,China

环境科学学报（英文版）

[1]Weigang Wang;Yan Chen;Lei Li;Li Zhou;Xubing Du;Mingyuan Liu;Maofa Ge-.Chemical composition of different size ultrafine particulate matter measured by nanoparticle chemical ionization mass spectrometer)[J].环境科学学报（英文版）,2022(04):434-443

ioniza,picogram

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