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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-412
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 09 Jul 2018

Research article | 09 Jul 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).

A comprehensive study of hygroscopic properties of calcium- and magnesium-containing salts: implication for hygroscopicity of mineral dust and sea salt aerosols

Liya Guo1,5,*, Wenjun Gu1,5,*, Chao Peng2,5, Weigang Wang2, Yong Jie Li3, Taomou Zong4, Yujing Tang1, Zhijun Wu4, Qinhao Lin1, Maofa Ge2,5,6, Guohua Zhang1, Min Hu4, Xinhui Bi1, Xinming Wang1,5,6, and Mingjin Tang1,5 Liya Guo et al.
  • 1State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • 2State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
  • 3Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Avenida da Universidade, Taipa, Macau, China
  • 4State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 5University of Chinese Academy of Sciences, Beijing 100049, China
  • 6Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • *These authors contributed equally to this work.

Abstract. Calcium- and magnesium-containing salts are important components for mineral dust and sea salt aerosols, but their physicochemical properties are not well understood yet. In this study, the hygroscopic properties of eight Ca- and Mg-containing salts, including Ca(NO3)2·4H2O, Mg(NO3)2·6H2O, MgCl2·6H2O, CaCl2·6H2O, Ca(HCOO)2, Mg(HCOO)2·2H2O, Ca(CH3COO)2·H2O and Mg(CH3COO)2·4H2O, were systematically investigated using two complementary techniques. A vapor sorption analyzer was used to measure the change of sample mass with relative humidity (RH) under isotherm conditions, and the deliquescence relative humidities (DRH) for temperature in the range of 5–30°C as well as water-to-solute ratios as a function of RH at 5 and 25°C were reported for these eight compounds. DRH values showed a large variation for these compounds; for example, at 25°C the DRH values were measured to be ~28.5% for CaCl2·6H2O and >95% for Ca(HCOO)2 and Mg(HCOO)2·2H2O. In addition, a humidity-tandem differential analyzer was used to measure the change in mobility diameter with RH (up to 90%) at room temperature, in order to determine the hygroscopic growth factors of aerosol particles generated by atomizing water solutions of these eight compounds. All the aerosol particles studied in this work, very likely to be amorphous, started to grow at very low RH (as low as 10%) and showed continuous growth with RH. The hygroscopic growth factors at 90% RH were found to range from 1.26±0.04 for Ca(HCOO2)2 and 1.79±0.03 for Ca(NO3)2, varying significantly for the eight types of aerosols considered herein. Overall, our work provides a systematical and comprehensive investigation of the hygroscopic properties of these Ca- and Mg-containing salts, largely improving our knowledge in the physicochemical properties of mineral dust and sea salt aerosols.

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In this work, hygroscopic properties of eight Ca- and Mg-containing salts were systematically investigated using two complementary techniques. The results would largely improve our knowledge in the physicochemical properties of mineral dust and sea salt aerosols.
In this work, hygroscopic properties of eight Ca- and Mg-containing salts were systematically...
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