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Volume 26 Issue 6

Nov.  2009

Article Contents
Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2009 >  26(6): 1235-1240

A Multifunctional HTDMA System with a Robust Temperature Control

  • 1.

    Department of Environmental Science & Engineering, Fudan University, Shanghai 200433,Department of Environmental Science $\&$ Engineering, Fudan University, Shanghai 200433,Department of Environmental Science $\&$ Engineering, Fudan University, Shanghai 200433,Department of Environmental Science & Engineering, Fudan University, Shanghai 200433,Department of Environmental Science & Engineering, Fudan University, Shanghai 200433,Department of Atmospheric Sciences, Texas A & M University, College Station, TX77843, USA,Department of Atmospheric Sciences, Texas A & M University, College Station, TX77843, USA,Department of Atmospheric Sciences, Texas A & M University, College Station, TX77843, USA


doi: 10.1007/s00376-009-8134-3

  • The hygroscopicity of atmospheric aerosols significantly influences their size distribution, cloud condensation nuclei ability, atmospheric residence time, and climate forcing. In order to investigate the hygroscopic behavior of aerosol particles and serious haze in China, a Hygroscopic Tandem Differential Mobility Analyzers (HTDMA) system was designed and constructed at Fudan University. It can function as a scanning mobility particle sizing system to measure particle size distribution in the range of 20--1000 nm in diameter, as well as a hygroscopicity analyzer for aerosol particles with diameters between 20--400 nm in the range of 20%--90% RH (relative humidity). It can also measure the effect of uptake of inorganic acids or semi-VOCs on the hygroscopic behavior of aerosols, such as typical inorganic salts in atmospheric dust or their mixtures. The performance tests show that the system measured particle size of the standard polystyrene latex spheres (PSLs) is 197 nm, which is in excellent agreement with the certified diameter D=1996 nm, as well as a standard deviation of the repeated runs SD=8.9x10-4. In addition, the measured hygroscopic growth factors of the model compounds, (NH4)2SO4 and NaNO3, agree with the Kohler theoretical curves. The results indicate that the HTDMA system is an excellent and powerful tool for studying the hygroscopic behavior of submicron aerosols and meets the demand required for laboratory research and fieldwork on atmospheric aerosols in China.
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    • Manuscript History

    Manuscript received: 10 November 2009
    Manuscript revised: 10 November 2009
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    A Multifunctional HTDMA System with a Robust Temperature Control

    • 1. Department of Environmental Science & Engineering, Fudan University, Shanghai 200433,Department of Environmental Science $\&$ Engineering, Fudan University, Shanghai 200433,Department of Environmental Science $\&$ Engineering, Fudan University, Shanghai 200433,Department of Environmental Science & Engineering, Fudan University, Shanghai 200433,Department of Environmental Science & Engineering, Fudan University, Shanghai 200433,Department of Atmospheric Sciences, Texas A & M University, College Station, TX77843, USA,Department of Atmospheric Sciences, Texas A & M University, College Station, TX77843, USA,Department of Atmospheric Sciences, Texas A & M University, College Station, TX77843, USA
    • Manuscript received: 2009-11-10
    • Manuscript revised: 2009-11-10

    Abstract: The hygroscopicity of atmospheric aerosols significantly influences their size distribution, cloud condensation nuclei ability, atmospheric residence time, and climate forcing. In order to investigate the hygroscopic behavior of aerosol particles and serious haze in China, a Hygroscopic Tandem Differential Mobility Analyzers (HTDMA) system was designed and constructed at Fudan University. It can function as a scanning mobility particle sizing system to measure particle size distribution in the range of 20--1000 nm in diameter, as well as a hygroscopicity analyzer for aerosol particles with diameters between 20--400 nm in the range of 20%--90% RH (relative humidity). It can also measure the effect of uptake of inorganic acids or semi-VOCs on the hygroscopic behavior of aerosols, such as typical inorganic salts in atmospheric dust or their mixtures. The performance tests show that the system measured particle size of the standard polystyrene latex spheres (PSLs) is 197 nm, which is in excellent agreement with the certified diameter D=1996 nm, as well as a standard deviation of the repeated runs SD=8.9x10-4. In addition, the measured hygroscopic growth factors of the model compounds, (NH4)2SO4 and NaNO3, agree with the Kohler theoretical curves. The results indicate that the HTDMA system is an excellent and powerful tool for studying the hygroscopic behavior of submicron aerosols and meets the demand required for laboratory research and fieldwork on atmospheric aerosols in China.

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