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Preprints
https://doi.org/10.5194/acp-2020-442
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-442
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  25 May 2020

25 May 2020

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A revised version of this preprint is currently under review for the journal ACP.

On mineral dust aerosol hygroscopicity

Lanxiadi Chen1,6, Chao Peng1, Athanasios Nenes2,5, Wenjun Gu1,6, Hanjing Fu3, Xing Jian3, Huanhuan Zhang1,6, Guohua Zhang1, Jianxi Zhu4, Xinming Wang1,6,7, and Mingjin Tang1,6,7 Lanxiadi Chen et al.
  • 1State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • 2Civil andEnvironmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
  • 3State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
  • 4CAS Key Laboratory of Mineralogy and Metallogeny and Guangdong Provincial Key Laboratory of Mineral Physics and Material Research and Development, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
  • 5Institute of Chemical Engineering Sciences, Foundation for Research and Technology-Hellas, Patras, Greece
  • 6University of Chinese Academy of Sciences, Beijing, China
  • 7Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China

Abstract. Despite its importance, hygroscopicity of mineral dust aerosol remains highly uncertain. In this work, we investigated water adsorption and hygroscopicity of different mineral dust samples at 25 °C, via measuring sample mass at different relative humidity (RH, up to 90 %) using a very sensitive balance. Mineral dust samples examined (twenty one in total) included seven authentic mineral dust samples from different regions in the world and fourteen major minerals contained in mineral dust aerosol. At 90 % RH, mass ratios of adsorbed water to the dry mineral ranged from 0.0011 to 0.3080, largely depending on the BET surface areas of mineral dust samples. The surface coverages of adsorbed water were determined to vary between 1.26 and 8.63 at 90 % RH, and it was found that the Frenkel-Halsey-Hill (FHH) adsorption isotherm could well describe surface coverages of adsorbed water as a function of RH, with AFHH and BFHH parameters in the range of 0.15–4.39 and 1.10–1.91, respectively. The comprehensive and robust data obtained would largely improve our knowledge of hygroscopicity of mineral dust aerosol.

Lanxiadi Chen et al.

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Lanxiadi Chen et al.

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Short summary
We investigated hygroscopic properties of a number of mineral dust particles in a quantitative manner, via measuring the sample mass at different relative humidities. The robust and comprehensive data obtained would significantly improve our knowledge of hygroscopicity of mineral dust and its impacts on atmospheric chemistry and climate.
We investigated hygroscopic properties of a number of mineral dust particles in a quantitative...
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