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http://dx.doi.org/10.5572/KOSAE.2011.27.1.063

Filter-based Correction for Positive Sampling Artifacts in the Determination of Ambient Organic Carbon  

Kang, Byung-Wook (Division of Environmental Engineering, Chungju National University)
Yeon, Ik-Jun (Division of Environmental Engineering, Chungju National University)
Cho, Byung-Yeol (Division of Environmental Engineering, Chungju National University)
Park, Sang-Chan (Division of Environmental Engineering, Chungju National University)
Lee, Hak-Sung (Department of Environmental, Civil and Information System, Seowon University)
Jeon, Jun-Min (Green Jeonnam Environmental Complex Center, Suncheon First College)
Na, Kwang-Sam (California Air Resources Board, California Environmental Protection Agency)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.27, no.1, 2011 , pp. 63-72 More about this Journal
Abstract
This study describes the impact of positive sampling artifact caused by a filter-based sampling in the determination of ambient organic carbon (OC). Three different sampling media combinations were employed for this investigation: (1) Quartz filter-alone (Q-alone), (2) quartz filter behind quartz-fiber filter (QBQ), and (3) quartz filter and quartz filter behind Teflon filter (Q-QBT). The measurement of ambient OC was carried out at a semi-urban site near oceanside at the end of November of 2008. It was found that Q-alone sampling configuration resulted in a higher OC than QBQ and Q-QBT by 14% and 28%, respectively due to no correction for positive artifact caused by adsorption of gas-phase OC onto the filter. A lower quantity of OC was collected from the backup quartz filter on QBQ than that from Q-QBT. A possible explanation is that the front quartz filter of QBQ was not fully saturated with gas-phase OC during the sampling period, allowing smaller amount of gas-phase OC to reach the backup quartz filter. The contribution of positive artifact to $PM_{2.5}$ mass was approximately 2.15 ${\mu}g/m^3$ which is equivalent to 6% in terms of Q-QBT sampling configuration. The positive artifact was found to be more dominated during summer than during winter, showing temperature dependence. It was concluded that Q-QBT sampling configuration offers less impact of positive artifact on ambient OC sampling than QBQ in quantification of OC.
Keywords
Positive artifact; Organic carbon; Quartz filter; Sdsorption;
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Times Cited By KSCI : 3  (Citation Analysis)
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