| 光谱学与光谱分析 |
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| Single Particle Measurement of Suspended Soil Dust Using Laser Desorption/Ionization Time-of-Flight Mass Spectrometry |
| GUO Xiao-yong,ZHAO Wen-wu,LIN Ying,GU Xue-jun,ZHENG Hai-yang,FANG Li,ZHANG Wei-jun |
| Lab of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract Real-time measurement of size and composition of single soil dust particles using an aerosol time-of-flight laser mass spectrometry (ATOFLMS) was designed in our lab.Each particle’s aerodynamic diameter was determined by measuring the delay time between two continuous-wave lasers, a Nd∶YAG laser with a 266 nm pulsed output was used to desorb and ionize aerosol particles, and ions formed in the laser desorption/ionization process were accelerated into the time-of-flight drift region where they separated by mass-to-charge ratio, Then the composition of single particle was obtained.In the present paper, soil samples were collected from four different areas in China.After the pretreatment and suspension, the particle sample was then transferred to ATOFLMS through a plastic transfer line.During the campaign, a large number of size and mass spectra of single particles were obtained.The presence of crustal elements was observed in the mass spectra of individual particles.Iron, potassium, aluminum and calcium constitute the two most commonly detected cations.Other common cations observed in the mass spectra of soil particles include magnesium, and sodium.The detection results exhibit that the coarse particles with size of 1-2 μm are dominate in the detected particles.Experimental results show the ATOFLMS have important practical value for researching and monitoring of atmospheric aerosol environment.
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Received: 2007-05-10
Accepted: 2007-08-20
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Corresponding Authors:
GUO Xiao-yong
E-mail: xyguo@aiofm.ac.cn
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