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首页> 外文期刊>Atmospheric chemistry and physics >A comprehensive study of hygroscopic properties of calcium- and magnesium-containing salts: implication for hygroscopicity of mineral dust and sea salt aerosols
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A comprehensive study of hygroscopic properties of calcium- and magnesium-containing salts: implication for hygroscopicity of mineral dust and sea salt aerosols

机译：综合研究含镁和盐酸盐的吸湿性：矿物粉尘及海盐气溶胶吸湿性的含义

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摘要

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, hygroscopic properties of eight Ca- and Mg-containing salts, including Ca(NO3)(2)center dot 4H(2)O, Mg(NO3)(2)center dot 6H(2)O, MgCl2 center dot 6H(2)O, CaCl2 center dot 6H(2)O, Ca(HCOO)(2), Mg(HCOO)(2)center dot 2H(2)O, Ca(CH3COO)(2)center dot H2O and Mg(CH3COO)(2)center dot 4H(2)O, were 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 ( DRHs) for temperature in the range of 5-30 degrees C as well as water-to-solute ratios as a function of RH at 5 and 25 degrees C were reported for these eight compounds. DRH values showed large variation for these compounds; for example, at 25 degrees C DRHs were measured to be similar to 28.5% for CaCl2 center dot 6H(2)O and 95% for Ca(HCOO)(2) and Mg(HCOO)(2)center dot 2H(2)O. We further found that the dependence of DRH on temperature can be approximated by the Clausius-Clapeyron equation. In addition, a humidity tandem differential mobility analyzer was used to measure the change in mobility diameter with RH (up to 90 %) at room temperature, in order to determine 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 under dry conditions, started to grow at very low RH (as low as 10 %) and showed continuous growth with RH. Hygroscopic growth factors at 90% RH were found to range from 1.26 +/- 0.04 for Ca(HCOO)(2) to 1.79 +/- 0.03 for Ca(NO3)(2), and the single hygroscopicity parameter ranged from 0.09-0.13 for Ca(CH3COO)(2) to 0.49-0.56 for Ca(NO3)(2). Overall, our work provides a comprehensive investigation of hygroscopic properties of these
机译：含钙和含镁的盐是矿物粉尘和海盐气溶胶的重要组成部分，但它们的物理化学性质尚未得到很好的理解。在该研究中，含8种盐和盐的吸湿性，包括Ca（NO 3）（2）中心点4h（2）O，Mg（NO 3）（2）中心点6H（2）O，MgCl2中心点6H（2）O，CaCl2中心点6h（2）O，Ca（HCOO）（2），Mg（HCOO）（2）中心点2H（2）O，Ca（CH3COO）（2）中心点H2O和Mg （CH3COO）（2）中心点4h（2）o使用两种互补技术进行研究。使用蒸汽吸附分析仪测量等温条件下具有相对湿度（RH）的样品质量的变化，以及潮湿的相对湿度（DRH）温度为5-30℃，水 - 溶质据报道，这8种化合物报告了作为rH的函数作为Rh的函数的比率。 DRH值显示出这些化合物的大变化;例如，测量25℃的C DRH以类似于CaCl2中心点6h（2）o和＆gt的28.5％。 Ca（HCOO）（2）和Mg（HCOO）（2）中心点2H（2）o的95％。我们进一步发现，DRH对温度的依赖性可以通过Clausius-Clapeyron方程来近似。此外，湿度串联差分迁移率分析仪用于测量室温下用RH（高达90％）的迁移率直径的变化，以确定通过这8种化合物的雾化水溶液产生的气溶胶颗粒的吸湿生长因子。在这项工作中研究的所有气溶胶颗粒，在干燥条件下很可能是无定形的，开始在低温下（低至10％）生长（低至10％），并与RH显示连续生长。 90％RH的吸湿生长因子被发现为CA（HCOO）（2）至1.79 +/- 0.03的1.26 +/- 0.04，用于Ca（NO3）（2），单一的吸湿性参数范围为0.09-0.13对于Ca（CH3COO）（2）至0.49-0.56（NO 3）（2）。总体而言，我们的工作提供了全面调查这些吸湿性的

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  • 来源
    《Atmospheric chemistry and physics》 |2019年第4期|共19页
  • 作者

    Guo Liya; Gu Wenjun; Peng Chao; Wang Weigang; Li Yong Jie; Zong Taomou; Tang Yujing; Wu Zhijun; Lin Qinhao; Ge Maofa; Zhang Guohua; Hu Min; Bi Xinhui; Wang Xinming; Tang Mingjin;

  • 作者单位

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

    Chinese Acad Sci Inst Chem State Key Lab Struct Chem Unstable &

    Stable Speci Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Chem State Key Lab Struct Chem Unstable &

    Stable Speci Beijing 100190 Peoples R China;

    Univ Macau Fac Sci &

    Technol Dept Civil &

    Environm Engn Ave Univ Taipa Macao Peoples R China;

    Peking Univ Coll Environm Sci &

    Engn State Key Joint Lab Environm Simulat &

    Pollut Con Beijing 100871 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

    Peking Univ Coll Environm Sci &

    Engn State Key Joint Lab Environm Simulat &

    Pollut Con Beijing 100871 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

    Chinese Acad Sci Inst Chem State Key Lab Struct Chem Unstable &

    Stable Speci Beijing 100190 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

    Peking Univ Coll Environm Sci &

    Engn State Key Joint Lab Environm Simulat &

    Pollut Con Beijing 100871 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China;

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  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
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