First Continuous Measurement of Gaseous and Particulate Formic Acid in a Suburban Area of East China: Seasonality and Gas–Particle Partitioning,ACS Earth and Space Chemistry

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First Continuous Measurement of Gaseous and Particulate Formic Acid in a Suburban Area of East China: Seasonality and Gas–Particle Partitioning
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2019-12-24 , DOI: 10.1021/acsearthspacechem.9b00210
Jian Xu ₁ , Jia Chen ₁ , Yijie Shi ₁ , Na Zhao ₁ , Xiaofei Qin ₁ , Guangyuan Yu ₁ , Jiumeng Liu ₂ , Yanfen Lin ₃ , Qingyan Fu ₃ , Rodney J. Weber ₄ , Shan-Hu Lee ₅ , Congrui Deng _{1,

6} , Kan Huang _{1,

6,

7}

Affiliation

Being the most abundant monocarboxylic acid in the atmosphere, formic acid impacts secondary organic aerosol formation and acidity of wet deposition. Despite its significance in atmospheric chemistry, the sources/sinks and gas–particle partitioning of formic acid is not well-understood, especially in polluted environments. In this study, we simultaneously measured gaseous and particulate formic acid on an hourly basis, for the first time, in suburban Shanghai of East China. Both gaseous and particulate formic acid showed evident midday peaks in the summer, suggestive of photochemical production. Formic acid was dominated in the gas phase, with an average particulate fraction of 12.5 ± 4.9%. The thermodynamic model (E-AIM IV) significantly underestimated the concentrations of particulate formic acid, possibly as a result of the biased low effective Henry’s law constant and organic salt formation as well as the external mixing of formic acid with non-volatile cations. The partitioning of formic acid correlated well with the aerosol water content in the summer but not in the winter, which was possibly ascribed to the partitioning to the organic phase.

中文翻译：

在华东郊区首次连续测量气态和微粒甲酸：季节性和气-微粒分配

作为大气中最丰富的一元羧酸，甲酸会影响次级有机气溶胶的形成和湿沉降的酸度。尽管在大气化学中具有重要意义，但甲酸的来源/汇和气体-颗粒的分配仍未得到很好的理解，尤其是在污染的环境中。在这项研究中，我们首次每小时在华东郊区上海同时测量气态和颗粒状甲酸。气态和颗粒状甲酸在夏季均显示明显的午间高峰，表明光化学产生。甲酸在气相中占主导地位，平均颗粒分数为12.5±4.9％。热力学模型（E-AIM IV）大大低估了甲酸颗粒的浓度，可能是由于有效亨利定律常数偏低，有机盐形成以及甲酸与非挥发性阳离子的外部混合所致。甲酸的分配在夏季与气溶胶中的水含量相关性很好，而在冬季则没有，这很可能是由于分配给有机相造成的。

更新日期：2019-12-25

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