J4 ›› 2014, Vol. 31 ›› Issue (6): 746-752.

• 激光应用 • 上一篇    下一篇

气溶胶颗粒密度测量方法研究

杨自芹1,顾学军2,马超1,孔祥和1   

  1. 1.曲阜师范大学物理工程学院,山东曲阜 273165; 2.中国科学院安徽光学精密机械研究所大气物理化学研究室,合肥 230031
  • 收稿日期:2014-02-21 修回日期:2014-08-26 出版日期:2014-11-28 发布日期:2014-11-17
  • 通讯作者: 孔祥和,博士,教授,硕士生导师,主要从事环境光谱学、共振增强多光子电离质谱、痕量污染气体光谱和质谱监测方法研究等。 E-mail:xhkong@126.com
  • 作者简介:杨自芹(1986—),山东临沂人,在读硕士研究生,主要从事激光质谱和环境光谱学研究。 E-mail:sunnyzqyang@163.com
  • 基金资助:
    国家自然科学基金资助(41375147),曲阜师范大学博士科研启动基金(BSQD2004016)资助

Measurement of Aerosol Particle Density

YANG Zi-qin, GU Xue-jun, MA Chao, KONG Xiang-he   

  1. 1. College of Physics and Engineering, Qufu Normal University, Qufu 273165,China; 2.Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
  • Received:2014-02-21 Revised:2014-08-26 Published:2014-11-28 Online:2014-11-17

摘要: 探索研究了静电迁移分级器(DMA)联用气溶胶飞行时间质谱仪(ATOFMS)测量气溶胶颗粒密度的方法。由DMA选出单分散粒径的气溶胶颗粒,通入气溶胶飞行时间质谱仪测定其对应的空气动力学粒径。根据电迁移粒径和空气动力学粒径间的定量关系得到球形颗粒密度或者非球形颗粒的有效密度。首先对已知化学成分和密度的邻苯二甲酸二辛酯(DOP)气溶胶颗粒进行标定实验,然后运用该方法对非球形的硫酸铵、氯化钠、硝酸铵颗粒进行测量,有效密度分别为:1.211 g/cm3、1.333 g/cm3、1.039 g/cm3;球形的橄榄油颗粒密度为0.914 g/cm3。

关键词: 激光技术, 颗粒密度, 粒径测量, 空气动力学粒径, 迁移粒径, 气溶胶飞行时间质谱仪

Abstract: Exploring the method to measure the density of aerosol particles by using a Differential Mobility Analyzer (DMA) combination of aerosol time-of-flight mass spectrometer (ATOFMS). The DMA is used to select particles of specific mobility diameter whose vacuum aerodynamic diameter is determined by ATOFMS. Together the mobility and aerodynamic diameters yield the quantitative relationship between them, then obtain the particle density, ρp, or for aspherical particles effective density, ρeff. First of all a calibration experiment is carried out using Dioctyl Phthalate (DOP), known chemical composition and density, on the system. Then the application of the system to measure the aspherical particles of ammonium sulfate, sodium chloride, ammonium nitrate, yielding densities of 1.211 g/cm3,1.333 g/cm3,1.039 g/cm3 respectively. The spherical particle of olive oil’s particle density is 0.914 g/cm3.

Key words: laser techniques, particle density, particle size measurement, vacuum aerodynamic diameter, mobility diameter, ATOFMS

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