English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Physicochemical uptake and release of volatile organic compounds by soil in coated-wall flow tube experiments with ambient air

Li, G., Cheng, Y., Kuhn, U., Xu, R., Yang, Y., Meusel, H., et al. (2018). Physicochemical uptake and release of volatile organic compounds by soil in coated-wall flow tube experiments with ambient air. Atmospheric Chemistry and Physics Discussions, 18.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Li, Guo1, Author              
Cheng, Yafang1, Author              
Kuhn, Uwe1, Author              
Xu, Rongjuan, Author
Yang , Yudong, Author
Meusel, Hannah1, Author              
Wang, Zhibin1, Author              
Ma, Nan, Author
Wu , Yusheng, Author
Li, Meng1, Author              
Williams, J.2, Author              
Hoffmann , Thorsten, Author
Ammann, Markus, Author
Pöschl, Ulrich1, Author              
Shao, Min, Author
Su, Hang1, Author              
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

Content

show
hide
Free keywords: -
 Abstract: Volatile organic compounds (VOCs) play a key role in atmospheric chemistry. Emission and deposition on soil have been suggested as important sources and sinks of at- mospheric trace gases. The exchange characteristics and het- erogeneous chemistry of VOCs on soil, however, are not well understood. We used a newly designed differential coated- wall flow tube system to investigate the long-term variabil- ity of bidirectional air–soil exchange of 13 VOCs under am- bient air conditions of an urban background site in Bei- jing. Sterilized soil was investigated to address physicochem- ical processes and heterogeneous/multiphase reactions in- dependently from biological activity. Most VOCs revealed net deposition with average uptake coefficients ( γ ) in the range of 10 − 7 –10 − 6 (referring to the geometric soil sur- face area), corresponding to deposition velocities ( V d ) of 0.0013–0.01 cm s − 1 and soil surface resistances ( R c ) of 98– 745 s cm − 1 , respectively. Formic acid, however, was emit- ted at a long-term average rate of ∼ 6 × 10 − 3 nmol m − 2 s − 1 , suggesting that it was formed and released upon heteroge- neous oxidation of other VOCs. The soil–atmosphere ex- change of one individual VOC species can be affected by both its surface degradation/depletion caused by surface re- actions and by competitive uptake or heterogeneous forma- tion/accommodation of other VOC species. Overall, the re- sults show that physicochemical processing and heteroge- neous oxidation on soil and soil-derived dust can act as a sink or as a source of atmospheric VOCs, depending on molecular properties and environmental conditions.

Details

show
hide
Language(s): eng - English
 Dates: 2018
 Publication Status: Published in print
 Pages: 47
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.5194/acp-2018-683
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Atmospheric Chemistry and Physics Discussions
  Abbreviation : Atmos. Chem. Phys. Discuss.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Katlenburg-Lindau, Germany : European Geophysical Society, Copernicus Publ.
Pages: 47 Volume / Issue: 18 Sequence Number: - Start / End Page: - Identifier: ISSN: 1680-7367
CoNE: https://pure.mpg.de/cone/journals/resource/111076360006006