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Hygroscopic properties of oxalic acid and atmospherically relevant oxalates
Ma, Qingxin; He, Hong; Liu, Chang; He, H
2013
Source PublicationATMOSPHERIC ENVIRONMENT
Volume69Pages:281-288
AbstractOxalic acid and oxalates represent an important fraction of atmospheric organic aerosols, however, little knowledge about the hygroscopic behavior of these particles is known. In this study, the hygroscopic behavior of oxalic acid and atmospherically relevant oxalates (H2C2O4, (NH4)(2)C2O4, CaC2O4, and FeC2O4) were studied by Raman spectrometry and vapor sorption analyzer. Under ambient relative humidity (RH) of 10-90%, oxalic acid and these oxalates hardly deliquesce and exhibit low hygroscopicity, however, transformation between anhydrous and hydrated particles was observed during the humidifying and dehumidifying processes. During the water adsorption process, conversion of anhydrous H2C2O4, (NH4)(2)C2O4, CaC2O4, and FeC2O4 to their hydrated particles (i.e., H2C2O4 center dot 2H(2)O, (NH4)(2)C2O4-H2O, CaC2O4. H2O, and FeC2O4-2H(2)O) occurred at about 20% RH, 55% RH, 10% RH, and 75% RH, respectively. Uptake of water on hydrated Ca-oxalate and Fe-oxalate particles can be described by a multilayer adsorption isotherm. During the dehumidifying process, dehydration of H2C2O4 center dot 2H(2)O and (NH4)(2)C2O4 center dot H2O occurred at 5% RH while CaC2O4 center dot H2O and FeC2O4 center dot 2H(2)O did not undergo dehydration. These results implied that hydrated particles represent the most stable state of oxalic acid and oxalates in the atmosphere. In addition, the assignments of Raman shift bands in the range of 1610-1650 cm(-1) were discussed according to the hygroscopic behavior measurement results. (C) 2013 Elsevier Ltd. All rights reserved.
Department大气环境研究室
Indexed BySCI
WOS IDWOS:000315932800030
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/7253
Collection大气环境科学实验室
Corresponding AuthorHe, H
Recommended Citation
GB/T 7714
Ma, Qingxin,He, Hong,Liu, Chang,et al. Hygroscopic properties of oxalic acid and atmospherically relevant oxalates[J]. ATMOSPHERIC ENVIRONMENT,2013,69:281-288.
APA Ma, Qingxin,He, Hong,Liu, Chang,&He, H.(2013).Hygroscopic properties of oxalic acid and atmospherically relevant oxalates.ATMOSPHERIC ENVIRONMENT,69,281-288.
MLA Ma, Qingxin,et al."Hygroscopic properties of oxalic acid and atmospherically relevant oxalates".ATMOSPHERIC ENVIRONMENT 69(2013):281-288.
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