We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Measurement of carbonaceous aerosol with different sampling configurations and frequencies.
- Authors
Cheng, Y.; He, K.-B.
- Abstract
Carbonaceous aerosol in Beijing, China was measured with different sampling configurations (denuded vs. un-denuded) and frequencies (24 vs. 48 h averaged). Our results suggest that the negative sampling artifact of a bare quartz filter could be remarkably enhanced due to the uptake of water vapor by the filter medium, indicating that the positive sampling artifact tends to be underestimated under high humidity conditions. It was also observed that the analytical artifact (i.e., the underestimation of elemental carbon by the operationally defined value of the thermal-optical method) was more apparent for the low frequency samples such that their elemental carbon (EC) concentrations were about 15% lower than the reference values measured by the high-frequency, denuded filters. Moreover, EC results of the low frequency samples were found to exhibit a stronger dependence on the charring correction method. In addition, optical attenuation (ATN) of EC was retrieved from the carbon analyzer, and the low frequency samples were shown to be more significantly biased by the shadowing effect.
- Subjects
BEIJING (China); CARBONACEOUS aerosols; EMISSION control; ATMOSPHERIC chemistry; AIR pollution
- Publication
Atmospheric Measurement Techniques Discussions, 2015, Vol 8, Issue 3, p3171
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amtd-8-3171-2015