Author:
Liu Y. J.,Zhu T.,Zhao D. F.,Zhang Z. F.
Abstract
Abstract. To understand and predict the role of mineral aerosol particles processed by reactive nitrogen species in the atmosphere, the hygroscopic properties of both Ca(NO3)2 and Ca(NO3)2-containing mineral particles must be well understood. Using a micro-Raman system, the hygroscopic behaviors of micro-sized individual Ca(NO3)2 and internally mixed Ca(NO3)2/CaCO3 particles in both dehumidifying and humidifying processes were investigated systematically. In addition to accurate quantification of the dependence of water content on relative humidity (RH), significant new spectroscopic evidence related to chemical structure was also obtained to confirm the occurrence of amorphous solid state and to better understand the phase transition process. The Ca(NO3)2 particles exhibit reversible behavior in the dehumidifying and humidifying processes; they are in the state of solution droplets above 10% RH and amorphous hydrates below 7% RH, and phase transition occurs at 7–10% RH. The hygroscopic behavior of Ca(NO3)2/CaCO3 particles is identical to that of pure Ca(NO3)2 particles, suggesting a negligible effect of the slightly soluble CaCO3 inclusion on the hygroscopic behavior of a(NO3)2/CaCO3 particles.
Reference46 articles.
1. % vor jede Referenz Chan, C. K., Choi, M. Y., and Zhang, Y.: Observation of mass transfer limitation in evaporation of single levitated droplets, J. Aerosol Sci., 31, 989–990, 2000.
2. Chan, M. N. and Chan, C. K.: Mass transfer effects in hygroscopic measurements of aerosol particles, Atmos. Chem. Phys., 5, 2703–2712, 2005.
3. Chen, Q., Zhu, T., Li, H., Ding, J., and Li, Y.: In-situ investigation of the heterogeneous reactions on atmospheric particles by micro-Raman spectrometry, Prog. Nat. Sci., 15, 1518–1522, 2005.
4. Clegg, S. L., Brimblecombe, P., and Wexler, A. S.: Thermodynamic model of the system H$^+$-NH$_4^+$-SO$_4^2-$-NO$_3^-$-H2O at tropospheric temperatures, J. Phys. Chem. A., 102, 2137–2154, 1998.
5. Dentener, F. J., Carmichael, G. R., Zhang, Y., Lelieveld, J., and Crutzen, P. J.: Role of mineral aerosol as a reactive surface in the global troposphere, J. Geophys. Res. Atmos., 101, 22 869–22 889, 1996.
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