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Water uptake and hygroscopicity of perchlorates and implications for the existence of liquid water in some hyperarid environments
Gu, Wenjun1,3; Li, Yongjie2; Tang, Mingjin1; Jia, Xiaohong1,3; Ding, Xiang1; Bi, Xinhui1; Wang, Xinming1,4
2017
Source PublicationRSC ADVANCES
ISSN2046-2069
Volume7Issue:74Pages:46866-46873
Other Abstract

The existence of liquid water is a prerequisite for habitability. Deliquescence of perchlorates under subsaturated conditions has been proposed to explain the occurrence of liquid water in some hyperarid environments on the earth and on the Mars. However, the amount of liquid water associated with perchlorates under different conditions is not well understood yet. In this work, we have measured deliquescence relative humidity (DRH) of three perchlorates at different temperatures from 278 to 303 K. DRH decreases from (42.8 +/- 0.6)% at 278 K to (40.5 +/- 0.5)% at 303 K for Mg(ClO4)2center dot 6H2O, and from (18.5 +/- 0.5)% at 278 K to (15.5 +/- 0.5)% at 303 K for Ca(ClO4)2center dot 4H2O ; in contrast, deliquescence of KClO4 did not occur even when RH (relative humidity) was increased to 95%. In addition, we have determined the amount of water taken up by Ca(ClO4)2center dot 4H2O and Mg(ClO4)2center dot 6H2O as a function of RH (0-90%) and temperatures (278-298 K). It is found that when both salts are deliquesced, more water (similar to 10% on average) is associated with Mg(ClO4)2center dot 6H2O than Ca(ClO4)2center dot 4H2O on the per mole ClO4- base. Overall, this work would significantly improve our knowledge in hygroscopicity of perchlorates, and thus may provide fundamental insights into the hydrologic cycles in some hyperarid regions on the earth and on the Mars.

DOI10.1039/c7ra08366a
URLView the original
Indexed BySCI
Language英语
WOS Research AreaChemistry
WOS SubjectChemistry, Multidisciplinary
WOS IDWOS:000412451500040
PublisherROYAL SOC CHEMISTRY
The Source to ArticleWOS
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被引频次[WOS]:7   [WOS记录]     [WOS相关记录]
Document TypeJournal article
专题DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorTang, Mingjin
Affiliation1.State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Avenida da Universidade, Taipa, Macau, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
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Gu, Wenjun,Li, Yongjie,Tang, Mingjin,et al. Water uptake and hygroscopicity of perchlorates and implications for the existence of liquid water in some hyperarid environments[J]. RSC ADVANCES,2017,7(74):46866-46873.
APA Gu, Wenjun.,Li, Yongjie.,Tang, Mingjin.,Jia, Xiaohong.,Ding, Xiang.,...&Wang, Xinming.(2017).Water uptake and hygroscopicity of perchlorates and implications for the existence of liquid water in some hyperarid environments.RSC ADVANCES,7(74),46866-46873.
MLA Gu, Wenjun,et al."Water uptake and hygroscopicity of perchlorates and implications for the existence of liquid water in some hyperarid environments".RSC ADVANCES 7.74(2017):46866-46873.
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