Improved Lower Particle Size Limit for Aerosol Time-of-Flight Mass Spectrometry
Improved Lower Particle Size Limit for Aerosol Time-of-Flight Mass Spectrometry
复制标题
改进气溶胶飞行时间质谱的粒径下限
DOI：
10.1080/02786820121494
复制
发表时间：
2001
影响因子：
5.2
通讯作者：
K. Prather
中科院分区：
文献类型：
--
作者：
M. Gälli;S. Guazzotti;K. Prather
将便携式气溶胶飞行时间质谱仪（ATOFMS）的可探测粒径下限提高到0.08 μm。这是低于以前报道的，并已通过本文所述的仪器修改。空气动力学直径小于0.18 μm的颗粒的尺寸测量的不确定性不允许确定未知颗粒的精确尺寸，但是空气动力学直径低至0.08 μm的颗粒仍然可以被检测和化学分析。给出了涵盖0.18-2.1 μm尺寸范围的校准曲线。显示了用可移动的ATOFMS仪器同时获得的单个0.08 μm聚苯乙烯乳胶球和空气动力学直径为0.18 μm或更小的环境颗粒的正离子和负离子质谱。ATOFMS能够对多分散样品中的颗粒进行精确的尺寸测量和化学分析，最小可达0.18 μm，这使得它在其他单颗粒质谱仪中独树一帜。
The lower detectable particle size limit for a transportable aerosol time-of-flight mass spectrometer (ATOFMS) has been improved to 0.08 μm. This is lower than previously reported and has been achieved through instrumental modifications described in this paper. The uncertainty in the size measurement of particles with aerodynamic diameters less than 0.18 μm does not allow for determination of an exact size for unknown particles, but particles with aerodynamic diameters as low as 0.08 μm can still be detected and chemically analyzed. A calibration curve covering the size range 0.18-2.1 μm is presented. Simultaneously acquired positive and negative ion mass spectra of an individual 0.08 μm polystyrene latex sphere and an ambient particle with an aerodynamic diameter of 0.18 μm or less obtained with a transportable ATOFMS instrument are shown. The ability to precisely size and chemically analyze particles from a polydisperse sample down to 0.18 μm makes ATOFMS unique from other single particle mass spectrometry instruments.