121st General Meeting of the KCS

Type Poster Presentation
Area Environmental Energy
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ENVR.P-671
Subject Investigation of Chemical Compositions and Hygroscopic Properties of Aerosols Generated from NaCl and Dicarboxylic Acid Mixture Solutions Using In Situ Raman Microspectrometry
Authors Xue Li, CHUL-UN RO1,*
Inha University, China
1Department of Chemistry, Inha University, Korea
Abstract Recently, ambient sea spray aerosols (SSAs) were reported to undergo reactions with dicarboxylic acids. The hygroscopic properties of SSAs could be altered when chemical compositions of SSAs are modified, which in turn alters their optical properties and cloud-droplet nucleation efficiency. In this work, hygroscopic property and chemical reaction of aerosols generated from NaCl-oxalic acid (NaCl-OA), NaCl-succinic acid (NaCl-SA), and NaCl-glutaric acid (NaCl-GA) mixture solutions of different molar ratios were studied using in situ Raman microspectrometry. Observation and Raman analysis indicated sodium hydrogen oxalate (SHO) and disodium oxalate (DSO) were formed during dehydration process for NaCl-rich aerosols from solutions of NaCl : OA = 3 : 1 and 2 : 1. Meanwhile, for OA-rich aerosols from solutions of NaCl : OA = 1 : 1 and 1 : 2, only SHO was formed with almost complete consumption of NaCl. Hygroscopic behavior appeared to vary depending on the relative amounts of NaCl, OA, SHO, and DSO in the aerosols. However, for aerosol particles generated from NaCl-SA and NaCl-GA mixture solutions, the formation of monosodium succinate and glutarate salts was observed for SA-rich and GA-rich mixture aerosols with unreacted, remaining NaCl, indicating that chemical reactions for NaCl-SA, and NaCl-GA mixture systems did not occur as easily as NaCl-OA system.
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