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Environmental Engineering Research 2006;11(1): 33-44. DOI: https://doi.org/10.4491/eer.2006.11.1.033
ESTIMATION OF RAIN SCAVENGING RATIO FOR PARTICLE BOUND POLYCYCLIC AROMATIC HYDROCARBONS AND POLYCHLORINATED BIPHENYLS
Hyeon Kook Kim1, Yongseung Shin2, Dong Soo Lee3, and Jong-Guk Kim4
1Georgia Institute of Technology, Civil and Environmental Engineering, Atlanta, GA 30332, USA
2Graduate School of Environmental Studies, Seoul National University, San 56-1 Shilim-Dong, Kwanak-Gu, Seoul 151-742, Korea
3Environmental Management Division, Korea Environment Institute, 613-2 Bulkwang-Dong, Eunpyung-Gu, Seoul 122-706, Korea
4Department of Environmental Engineering, Chonbuk National University, 664-14 Duckjin-Dong, Duckjin-Gu, Chonju, Chonbuk 561-756, Korea
Corresponding Author: Yongseung Shin ,Tel: +82-02-380-7740, Fax: +82-02-380-7644, Email: shiny@kei.re.kr
Received: May 8, 2005;  Accepted: February 8, 2006.
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ABSTRACT
The objective of this study was to develop and assess a method for estimating the rain scaven¬ging ratios (RSRs) of particle-bound PAHs and PCBs using measured scavenging ratio of particulate matters (PM) and routinely available data of physico-chemical properties of PM. Paired atmospheric and rainwater sampling was conducted for a total of 4 rain events. Assuming equilibrium partitioning in rainwater-gas-PM system, an equation was derived for estimating the RSR of particle-bound chemicals as a function of RSR of PM and three equilibrium partition constants (i.e. dimensionless Henry's law constant, gas-particle parti¬tion coefficient, and water-particle partition coefficient). For all PAHs, the model significantly under-predic¬ted the RSR while the model prediction for PCBs agreed with observation mostly within a factor of 5. The RSR model for the chemicals is of limited use as its accuracy critically depends on how close the observed partitioning of the chemicals in the gas-PM-rainwater system is to that estimated under the equilibrium assumption.
Keywords: Rain | Scavenging | Particlulat matter | PAHs | PCBs
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