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A laboratory study on the hygroscopic behavior of H2C2O4-containing mixed particles
Ma, Qingxin; Liu, Chang; Ma, Jinzhu; Chu, Biwu; He, Hong
2019-03-01
Source PublicationATMOSPHERIC ENVIRONMENT
ISSN1352-2310
Volume200Pages:34-39
AbstractThe climatic effect of atmospheric particles is greatly dependent on their hygroscopicity and chemical composition. Although the hygroscopic behavior of individual components of aerosol has been widely studied, the effect of coexisting species on the hygroscopic behavior of mixed constituents is still not clear. In this study, we used Raman spectroscopy to investigate how particles with different hygroscopic behaviors affect each other when they are combined together in mixtures. The effect of coexisting hygroscopic components, e.g. NaCl, NH4NO3, and (NH4)(2)SO4, on the hygroscopic behavior of externally mixed H2C2O4/CaCO3 was studied. We found that coexisting NH4NO3 can promote the conversion of H2C2O4/CaCO3 to CaC2O4 center dot H2O in the humidifying process by providing a deliquesced solution to dissolve H+ in the oxalic acid matrix. Moreover, competition and blocking effects existed in the case of coexisting (NH4)(2)SO4. Reactions between (NH4)(2)SO4 and CaCO3 led to the formation of CaSO4 center dot 2H(2)O and (NH4)(2)C2O4 instead of CaC2O4. NaCl reacted with H2C2O4 in solution to form Na2C2O4. These results suggested that synergistic effects between coexisting components in mixed particles during the humidifying-dehumidifying process may change their chemical composition, mixing state, and hygroscopicity. In addition, chemical reactions should be considered in future studies on the hygroscopic behavior of mixed particles.
Department水污染控制实验室
KeywordHygroscopic behavior Aerosol mixture Synergistic effect Oxalic acid Calcite
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43221
Collection水污染控制实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Urban Atmospher Environm, Xiamen 361021, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
4.Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing 100081, Peoples R China
5.Chinese Acad Meteorol Sci, China Meteorol Adm, Key Lab Atmospher Chem, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Ma, Qingxin,Liu, Chang,Ma, Jinzhu,et al. A laboratory study on the hygroscopic behavior of H2C2O4-containing mixed particles[J]. ATMOSPHERIC ENVIRONMENT,2019,200:34-39.
APA Ma, Qingxin,Liu, Chang,Ma, Jinzhu,Chu, Biwu,&He, Hong.(2019).A laboratory study on the hygroscopic behavior of H2C2O4-containing mixed particles.ATMOSPHERIC ENVIRONMENT,200,34-39.
MLA Ma, Qingxin,et al."A laboratory study on the hygroscopic behavior of H2C2O4-containing mixed particles".ATMOSPHERIC ENVIRONMENT 200(2019):34-39.
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