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

• Laser Applications • Previous Articles     Next Articles

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

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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