Secondary Organic Aerosol Mass Yield and Characteristics from 4-ethylguaiacol Aqueous·OH Oxidation: Effects of Initial Concentration

• Published in: Huanjing kexue Vol. 41; no. 1; p. 146
• Main Authors: Zhuang, Yu, Chen, Yan-Tong, Li, Xu-Dong, Ma, Shuai-Shuai, Zhao, Zhu-Zi, Ye, Zhao-Lian, Gai, Xin-Lei
• Format: Journal Article
• Language: Chinese
• Published: China 08.01.2020
• Subjects: 4-ethylguaiacol; aqueous secondary organic aerosol (aqSOA); soot-particle aerosol mass spectrometry (SP-AMS); mass yield; light-absorbing characteristics
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.201906167

Aqueous-phase chemical processing, as an essential formation pathway of secondary organic aerosol (SOA), has attracted widespread attention from within atmospheric chemistry fields. Due to the complicated reaction nature, reaction mechanisms, and product characteristics of aqueous-phase chemical processing, its contribution to the SOA budget is still not fully understood. In this work, we investigate how the initial concentration (0.03-3 mmol·L ) of 4-ethylguaiacol affects SOA formation of aqueous·OH photochemical oxidation. We use soot-particle aerosol mass spectrometry (SP-AMS) to monitor SOA mass yield and oxidation character, and gas chromatography-mass spectrometry (GC-MS) and ion chromatography (IC) to measure products and organic acids. Additionally, we use ultraviolet visible spectroscopy (UV-vis) and high-performance liquid spectrometry (HPLS) to track the formation of light-absorbing products such as humic-like substances (HULIS). Our research indicated that the range of the O/C ratio of EG-aqSOA me