Gas-Particle Partitioning of Carbonyl Compounds in the Ambient Atmosphere

Environmental Science & Technology
Hengqing ShenWenxiao Shi

Abstract

Despite their crucial roles in health and climate concerns, the gas-particle partitioning of carbonyl compounds is poorly characterized in the ambient atmosphere. In this study, we investigate their partitioning by simultaneously measuring six carbonyl compounds (formaldehyde, acetaldehyde, acetone, propionaldehyde, glyoxal, and methylglyoxal) in the gas and particle phase at an urban site in Beijing. The field-derived partitioning coefficients ( Kpf) are in the range of 10-5-10-3 m3 μg-1, and the corresponding effective Henry's law coefficients ( KHf) should be 107-109 M atm-1. The Pankow's absorptive partitioning theory and Henry's law both significantly underestimate concentrations of particle-phase carbonyl compounds (105-106 times and >103 times, respectively). The observed "salting-in" effects only partially explain the enhanced partitioning to particles, which is approximately 1 order of magnitude. The measured Kpf values are higher at low relative humidity, and the overall effective vapor pressure of these carbonyl species are lower than their hydrates, indicating that carbonyl oligomers potentially formed in highly concentrated particle phase. The reaction kinetics of oligomer formation should be included if applying H...Continue Reading

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Citations

Apr 4, 2019·Environmental Science. Processes & Impacts·Jin Y ChenYing-Hsuan Lin
Jan 3, 2021·The Science of the Total Environment·Hengqing ShenWenxing Wang
Jul 29, 2021·Environmental Science & Technology·Jingwei LiuYuanhang Zhang
Aug 26, 2020·Environmental Science & Technology·Yiming QinScot T Martin
Dec 7, 2021·The Science of the Total Environment·Rongjuan XuYuanhang Zhang

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