4.5 Article

Insight into Source and Evolution of Oxalic Acid: Characterization of Particulate Organic Diacids in a Mega-City, Shanghai from 2008 to 2020

期刊

ATMOSPHERE
卷 13, 期 9, 页码 -

出版社

MDPI
DOI: 10.3390/atmos13091347

关键词

organic acids; oxalate; source; VOCs; atmospheric oxidation

资金

  1. National Natural Science Foundation of China [41877373]

向作者/读者索取更多资源

Organic acids play an important role in aerosol composition and have significant implications on particle formation, growth, acidity, phase state, and environmental impacts. Oxalic acid is found to be the most abundant organic diacid in Shanghai, with significant correlations with sulfate. Meteorological factors and atmospheric oxidation capacity influence the formation of oxalic acid. The study suggests that oxalic acid may be derived from the secondary oxidation of volatile organic compounds.
Organic acids are important aerosol compositions with significant implications on particle formation, growth, acidity, phase state, and environmental impacts. Oxalic acid was found to be the most abundant particulate organic diacid in Shanghai during the study period, accounting for similar to 58% of the total dicarboxylic acids (C2-C10). Biomass burning (BB) explained a small but non-negligible fraction (less than 10%) of oxalate. Significant correlations between oxalate and sulfate indicated a potentially synergistic formation mechanism of oxalate and sulfate. In addition, meteorological factors such as ambient temperature and relative humidity were found to influence the formation of oxalate. Higher oxalate relative to inorganic particulate content was found in summer. Potential source contribution function analysis suggested that most of the oxalate observed in Shanghai was produced locally. The formation of oxalate was largely impacted by atmospheric oxidation capacity as indicated by its significant correlations with both secondary organic carbon (SOC) and sulfur oxidation ratio (SOR). The evolution of oxalate, oxalate/sulfate, oxalate/organic carbon were consistent with the emission trend of volatile organic carbons (VOCs) in recent years, indicating that oxalate may be derived from secondary oxidation of VOCs, which is further confirmed by a positive relationship between O-x and oxalate/VOCs over the study period. With a detailed characterization of oxalate in Shanghai, our study highlights the importance of regulating primary emissions, such as VOCs, as well as mitigation of atmospheric oxidation capacity in controlling air pollution in a coastal megacity.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据