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Your search keyword '"Tilgner, Andreas"' showing total 9 results
Start Over Author "Tilgner, Andreas" Journal environmental science & technology
9 results on '"Tilgner, Andreas"'

1. Particle-Phase Photoreactions of HULIS and TMIs Establish a Strong Source of H2O2 and Particulate Sulfate in the Winter North China Plain

Author

Ye, Can, primary, Chen, Hui, additional, Hoffmann, Erik H., additional, Mettke, Peter, additional, Tilgner, Andreas, additional, He, Lin, additional, Mutzel, Anke, additional, Brüggemann, Martin, additional, Poulain, Laurent, additional, Schaefer, Thomas, additional, Heinold, Bernd, additional, Ma, Zhuobiao, additional, Liu, Pengfei, additional, Xue, Chaoyang, additional, Zhao, Xiaoxi, additional, Zhang, Chenglong, additional, Zhang, Fei, additional, Sun, Hao, additional, Li, Qing, additional, Wang, Lin, additional, Yang, Xin, additional, Wang, Jinhe, additional, Liu, Cheng, additional, Xing, Chengzhi, additional, Mu, Yujing, additional, Chen, Jianmin, additional, and Herrmann, Hartmut, additional

Published
2021
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2. Organosulfates in Ambient Aerosol: State of Knowledge and Future Research Directions on Formation, Abundance, Fate, and Importance

Author

Brüggemann, Martin, primary, Xu, Rongshuang, additional, Tilgner, Andreas, additional, Kwong, Kai Chung, additional, Mutzel, Anke, additional, Poon, Hon Yin, additional, Otto, Tobias, additional, Schaefer, Thomas, additional, Poulain, Laurent, additional, Chan, Man Nin, additional, and Herrmann, Hartmut, additional

Published
2020
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5. Particle-Phase Photoreactions of HULIS and TMIs Establish a Strong Source of H2O2and Particulate Sulfate in the Winter North China Plain

Author

Ye, Can, Chen, Hui, Hoffmann, Erik H., Mettke, Peter, Tilgner, Andreas, He, Lin, Mutzel, Anke, Brüggemann, Martin, Poulain, Laurent, Schaefer, Thomas, Heinold, Bernd, Ma, Zhuobiao, Liu, Pengfei, Xue, Chaoyang, Zhao, Xiaoxi, Zhang, Chenglong, Zhang, Fei, Sun, Hao, Li, Qing, Wang, Lin, Yang, Xin, Wang, Jinhe, Liu, Cheng, Xing, Chengzhi, Mu, Yujing, Chen, Jianmin, and Herrmann, Hartmut

Abstract

During haze periods in the North China Plain, extremely high NO concentrations have been observed, commonly exceeding 1 ppbv, preventing the classical gas-phase H2O2formation through HO2recombination. Surprisingly, H2O2mixing ratios of about 1 ppbv were observed repeatedly in winter 2017. Combined field observations and chamber experiments reveal a photochemical in-particle formation of H2O2, driven by transition metal ions (TMIs) and humic-like substances (HULIS). In chamber experiments, steady-state H2O2mixing ratios of 116 ± 83 pptv were observed upon the irradiation of TMI- and HULIS-containing particles. Correspondingly, H2O2formation rates of about 0.2 ppbv h–1during the initial irradiation periods are consistent with the H2O2rates observed in the field. A novel chemical mechanism was developed explaining the in-particle H2O2formation through a sequence of elementary photochemical reactions involving HULIS and TMIs. Dedicated box model studies of measurement periods with relative humidity >50% and PM2.5≥ 75 μg m–3agree with the observed H2O2concentrations and time courses. The modeling results suggest about 90% of the particulate sulfate to be produced from the SO2reaction with OH and HSO3–oxidation by H2O2. Overall, under high pollution, the H2O2-caused sulfate formation rate is above 250 ng m–3h–1, contributing to the sulfate formation by more than 70%.

Published
2021
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8. Atmospheric Peroxides in a Polluted Subtropical Environment: Seasonal Variation, Sources and Sinks, and Importance of Heterogeneous Processes

Author

Guo, Jia, primary, Tilgner, Andreas, additional, Yeung, Chungpong, additional, Wang, Zhe, additional, Louie, Peter K. K., additional, Luk, Connie W. Y., additional, Xu, Zheng, additional, Yuan, Chao, additional, Gao, Yuan, additional, Poon, Steven, additional, Herrmann, Hartmut, additional, Lee, Shuncheng, additional, Lam, Ka Se, additional, and Wang, Tao, additional

Published
2014
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9. Atmospheric Peroxides in a Polluted Subtropical Environment: Seasonal Variation, Sources and Sinks, and Importance of Heterogeneous Processes.

Author

Jia Guo, Tilgner, Andreas, Chungpong Yeung, Zhe Wang, Louie, Peter K. K., Luk, Connie W. Y., Zheng Xu, Chao Yuan, Yuan Gao, Poon, Steven, Herrmann, Hartmut, Shuncheng Lee, Ka Se Lam, and Tao Wang

Subjects
*HYDROGEN peroxide, *HYDROGEN, *PEROXIDES, *ATMOSPHERIC chemistry, *METAL ions
Abstract

Hydrogen peroxide (H2O2) and organic peroxides play an important role in atmospheric chemistry, but knowledge of their abundances, sources, and sinks from heterogeneous processes remains incomplete. Here we report the measurement results obtained in four seasons during 2011-2012 at a suburban site and a background site in Hong Kong. Organic peroxides were found to be more abundant than H2O2, which is in contrast to most previous observations. Model calculations with a multiphase chemical mechanism suggest important contributions from heterogeneous processes (primarily transition metal ion [TMI]-HOx reactions) to the H2O2 budget, accounting for about one-third and more than half of total production rate and loss rate, respectively. In comparison, they contribute much less to organic peroxides. The fast removal of H2O2 by these heterogeneous reactions explains the observed high organic peroxide fractions. Sensitivity analysis reveals that the role of heterogeneous processes depends on the abundance of soluble metals in aerosol, serving as a net H2O2 source at low metal concentrations, but as a net sink with high metal loading. The findings of this study suggest the need to consider the chemical processes in the aerosol aqueous phase when examining the chemical budget of gas-phase H2O2. [ABSTRACT FROM AUTHOR]

Published
2014
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