真空紫外光电离成核气溶胶质谱仪测量超细纳米颗粒物的化学成分  

Detection of Chemical Compositions of Ultrafine Nanoparticles by a Vacuum Ultraviolet Photoionization Nucleation Aerosol Mass Spectrometer

作　　者：温作赢 唐小锋 王涛 顾学军 张为俊[1] WEN Zuo-Ying;TANG Xiao-Feng;WANG Tao;GU Xue-Jun;ZHANG Wei-Jun(Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;Graduate School,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031 [2]中国科学技术大学研究生院,合肥230026

出　　处：《分析化学》2020年第4期491-497,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.91644109,21773249,U1832184);国家重点研发计划项目(No.2016YFC0200300)资助。

摘　　要：将自行研制的真空紫外光电离成核气溶胶质谱仪用于实时在线测量超细纳米颗粒物(Dp<100nm)的化学成分。此气溶胶质谱仪采用商品化的纳米扫描电迁移率颗粒物粒径谱仪(Nano-scanningmobilityparticlesizers,Nano-SMPS),选择出单分散粒径的超细纳米颗粒物,结合空气动力学透镜传输和聚焦超细纳米颗粒物进入真空腔体,进而在加热棒表面热解析气化成气态的分子,分子吸收真空紫外放电灯的光子能量(hν=10.6eV)在其电离能阈值附近“软”电离,通过反射式飞行时间质量分析器从分子水平上在线测量获得超细纳米颗粒物的化学成分。同时,以单分散粒径的邻苯二甲酸二辛酯(DioctylPhthalate,DOP,C24H38O4)、α-蒎烯(α-pinene,C10H16)臭氧氧化成核反应生成的超细纳米颗粒物作为示例,结合真空紫外光电离成核气溶胶质谱仪对其化学成分进行检测分析,并对仪器性能进行了应用表征。A vacuum ultraviolet photoionization nucleation aerosol mass spectrometer(VUVPI-AMS)was utilized for detection of chemical compositions of ultrafine nanoparticles with size less than 100 nm.A commercial nano scanning mobility particle sizer(Nano-SMPS)was employed to size-select ultrafine nanoparticles and measure their size distribution.A special aerodynamic lens was developed to transfer and focus the ultrafine nanoparticle into the vacuum.After heated on the surface of the heater,the ultrafine nanoparticles were vaporized and changed into gas-phase molecules,followed by softly photoionization at their ionization energy thresholds by the VUV light emitted from a commercial 10.6 eV krypton discharge lamp.A home-made orthogonal acceleration reflection time-of-flight mass analyzer was adopted to measure the mass of ions.As representative examples,the dioctyl phthalate(DOP)ultrafine nanoparticles and the nucleation nanoparticles from the ozonolysis reaction ofα-pinene with ozone were studied and their chemical compositions were obtained with molecular information.

关 键 词：真空紫外光电离质谱 超细纳米颗粒物 化学成分 Α-蒎烯 

分 类 号：X831[环境科学与工程—环境工程] O657.63[理学—分析化学]