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ESTIMATION OF RAIN SCAVENGING RATIO FOR PARTICLE BOUND POLYCYCLIC AROMATIC HYDROCARBONS AND POLYCHLORINATED BIPHENYLS

  • Kim, Hyeon-Kook (Georgia Institute of Technology, Civil and Environmental Engineering) ;
  • Shin, Yong-Seung (Environmental Management Division, Korea Environment Institute) ;
  • Lee, Dong-Soo (Graduate School of Environmental Studies, Seoul National University) ;
  • Song, Byung-Joo (Department of Environmental Engineering, Chonbuk National University) ;
  • Kim, Jong-Guk (Department of Environmental Engineering, Chonbuk National University)
  • Published : 2006.02.28

Abstract

The objective of this study was to develop and assess a method for estimating the rain scavenging 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 partition coefficient, and water-particle partition coefficient). For all PAHs, the model significantly under-predicted 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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