Development of an aerosol mass spectrometer for size and composition analysis of submicron particles
Development of an aerosol mass spectrometer for size and composition analysis of submicron particles
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DOI：
10.1080/027868200410840
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发表时间：
2000-07-01
影响因子：
5.2
通讯作者：
Worsnop, DR
中科院分区：
文献类型：
--
作者：
Jayne, JT;Leard, DC;Worsnop, DR
大气气溶胶在调节地球气候中的重要性及其对空气质量和人类健康的潜在有害影响刺激了对能够实时分析尺寸分辨的气溶胶、质量和化学成分的仪器的需求。我们描述了一种气溶胶质谱仪(AMS)，它是为响应这些气溶胶采样需求而开发的，并展示了对实验室产生的纯组分NH4NO3气溶胶的定量测量能力。该仪器将标准真空和质谱学技术与最近开发的气溶胶采样技术相结合，一种独特的空气动力气溶胶进气口(由明尼苏达大学开发)将粒子聚焦到窄光束中并有效地将它们传输到真空中，在真空中通过粒子飞行时间(TOF)测量来确定空气动力学粒子的大小，在电阻加热表面上进行粒子闪蒸后的时间分辨粒子质量检测，给出了空气动力学粒子速度和粒子收集效率测量的校准数据，将测量气溶胶尺寸和质量分布的能力与使用差分迁移率分析仪(DMA)和凝结粒子计数器(CPC)同时测量的能力进行了比较，展示了具有质量浓度和GT的纯组分NH4NO3气溶胶的定量尺寸分类；与0.25µg·m(-3)类似，还给出了气动透镜性能的流体力学计算结果，并与测量性能进行了比较，讨论了该AMS作为实验室和手持式仪器的用途。
The importance of atmospheric aerosols in regulating the Earth's climate and their potential detrimental impact on air quality and human health has stimulated the need for instrumentation which can provide real-time analysis of size resolved aerosol, mass, and chemical composition, We describe here an aerosol mass spectrometer (AMS) which has been developed in response to these aerosol sampling needs and present results which demonstrate quantitative measurement capability for a laboratory-generated pure component NH4NO3 aerosol, The instrument combines standard vacuum and mass spectrometric technologies with recently developed aerosol sampling techniques, A unique aerodynamic aerosol inlet (developed at the University of Minnesota) focuses particles into a narrow beam and efficiently transports them into vacuum where aerodynamic particle size is determined via a particle time-of-flight (TOF) measurement, Time-resolved particle mass detection is performed mass spectrometrically following particle flash vaporization on a resistively heated surface, Calibration data are presented for aerodynamic particle velocity and particle collection efficiency measurements, The capability to measure aerosol size and mass distributions is compared to simultaneous measurements using a differential mobility analyzer (DMA) and condensation particle counter (CPC), Quantitative size classification is demonstrated for pure component NH4NO3 aerosols having mass concentrations > similar to 0.25 mu g m(-3), Results of fluid dynamics calculations illustrating the performance of the aerodynamic lens are also presented and compared to the measured performance, The utility of this AMS as both a laboratory and held portable instrument is discussed.