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| Titel |
Surface-active Substances in the biomass burning and atmospheric particles in the North China Plain, China |
| VerfasserIn |
Zhijun Wu, Yao Bai, Yuechen Liu, Yujue Wang, Kai Qiao, Yusheng Wu, Min Hu |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126620
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| Publikation (Nr.) |
 EGU/EGU2016-6371.pdf |
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| Zusammenfassung |
| Surface active materials, such as HUmic-LIke Substances (HULIS), play an important role in
particle hygroscopicity and activation by taking up water and acting as surfactants. They
account for large proportions of water soluble organic carbon. Currently, the information on
the chemical composition, hygroscopicity, and surface active properties of HULIS is still very
scarce in china, which is suffering from heavy air pollution. Therefore, we promoted this
study to investigate the hygroscopic growth and CCN activity of HULIS particles
using hygroscopicity tandem differential mobility analyser and condensation cloud
nuclei counter and surface tension depression using contact angle meter (KRÜSS
GmbH).
Two different types of particles were investigated in our study. One is the particles
emitted from biomass burning. The wheat and corn straw residuals were burned in a lab
burning simulator. The PM2.5 samples were collected onto quartz filters. Another is PM2.5
taken during the heavy hazy days. The HULIS were isolated from PM2.5 samples by water
exaction, C18 solid phase extraction (SPE), CH3OH elution, and N2 drying. Then, the water
solution of HULIS was generated to particles using TSI atomizer. The hygroscopicity of
HULIS particles were detected by hygroscopicity tandem differential mobility analyzer. The
temperature dependency of HULIS surface tension was detected using contact angle meter.
The primary results showed that PM2.5 consists of a large amount of surface active materials
during severe air pollution episodes. A clear temperature dependency of surface tension
was observed. At temperature of 20 degree, the surface tension of HULIS exacted
from ambient samples is around 50 N/m2, which is much lower than that of pure
water. The future investigations will include the effects of burning conditions on the
HULIS concentration and surface tensions. In the presentation, a full picture of the
hygroscopicity and CCN activity, and surface active properties of HULIS will be
presented.
Acknowledgement
This work is supported by the following projects: National Natural Science Foundation of
China (41475127), National Basic Research Program of China (2013CB228503), and the
Nonprofit research projects of environmental protection department of China (201409010). |
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