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| Titel |
Technical Note: The application of an improved gas and aerosol collector for ambient air pollutants in China |
| VerfasserIn |
H.-B. Dong, L.-M. Zeng, M. Hu, Y.-S. Wu, Y.-H. Zhang, J. Slanina, M. Zheng, Z.-F. Wang, R. Jansen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 21 ; Nr. 12, no. 21 (2012-11-12), S.10519-10533 |
| Datensatznummer |
250011580
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| Publikation (Nr.) |
 copernicus.org/acp-12-10519-2012.pdf |
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| Zusammenfassung |
| An improved Gas and Aerosol Collector (GAC) equipped with a newly designed
aerosol collector and a set of dull-polished wet annular denuder (WAD) was
developed based on a Steam Jet Aerosol Collector (SJAC) sampler. Combined
with Ion Chromatography (IC) the new sampler performed well in laboratory
tests with high collection efficiencies for SO2 (above 98%) and
particulate sulfate (as high as 99.5%). An inter-comparison between the
GAC-IC system and the filter-pack method was performed and the results
indicated that the GAC-IC system could supply reliable particulate sulfate,
nitrate, chloride, and ammonium data in field measurement with a much wider
range of ambient concentrations. When applied in two major field campaigns
(rural and coastal sites) in China, the GAC-IC system provided high-quality
data in ambient conditions even under high loadings of pollutants. Its
measurements were highly correlated with data by other commercial
instruments such as the SO2 analyzer (43c, Thermo-Fisher, USA; R2
as 0.96), the HONO analyzer (LOPAP, Germany; R2 as 0.91 for samples
from 15:00 to 07:00), a filter sampler (Tianhong, China; R2 as 0.86 for
SO42−), and Aerosol Mass Spectrometer (AMS, Aerodyne, USA; R2
above 0.77 for major species) over a wide range of concentrations. Through
the application of the GAC-IC system, it was identified that 70% of
chloride and nitrate by the filter method could be lost during daytime
sampling due to high temperature in the rural site of Kaiping. In Changdao
field campaign (coastal site), though a particle dryer was applied, its
drying efficiency was not well considered for the collection efficiency of
AMS seemed still interfered a bit by local high relative humidity. If the
inter-comparison was done with relative humidity below 50%, the
correlations ranged from 0.81 to 0.94 for major species. Through laboratory
and field studies, this instrument is proved particularly useful in future
intensive campaigns or long-term monitoring stations to study various
environmental issues such as secondary aerosol and haze formation, as well
as climate change. |
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