Development of a Volatility Hygroscopic Tandem Differential Mobility Analyzer (VH-TDMA) for the measurement of aerosol thermal and hygroscopic properties
1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2. University of Science and Technology, Hefei 230026, China
A volatility hygroscopic tandem differential mobility analyzer (VH-TDMA) was developed and used to measure and research the actual aerosol hygroscopic and thermal properties. The heating unit equipped with four symmetric heating tubes worked at 25℃, 150℃, 250℃ and 350℃, respectively. With rapid switching of the samples between different heating tubes, a higher temporal resolution could be achieved compared to regular V-TDMA. The humidification unit humidified the aerosol sample by using Nafion tubes. The relative humidity (RH) of the sample was controlled within the range of 10% to 90% with an accuracy of 1%.The particle loss and the accuracy of the developed system were evaluated with laboratory generated sodium chloride and ammonium sulfate samples. The measured results were in good agreement with those literature reported values, which confirmed that the developed VH-TDMA system was suitable for accuracy measurement of the hygroscopic and thermal properties of atmospheric aerosols. Field application of the system was carried out at the Shouxian National Climate Observatory in Anhui Province. The hygroscopic properties and volatilization characteristics of summer aerosol were studied. The results showed a positive correlation between the aerosol hygroscopic growth factor and particle size, and a pronounced diurnal cycle of the mixing state of the carbonaceous aerosol was observed.
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