The enhanced dissolution of some chlorinated hydrocarbons and monocyclic aromatic hydrocarbons in rainwater collected in Yokohama, Japan

摘要: Abstract By simultaneous sequential sampling of gas and rainwater from 1999 to 2000 in the campus Kanagawa University Yokohama, Japan, we investigated wet-scavenging process volatile organic compounds, some chlorinated hydrocarbons (CHs) monocyclic aromatic (MAHs), via rain droplets. Their volume-weighted mean concentrations 125 were 4.98 nM for dichloromethane, 3.71 nM toluene, 2.00 nM benzene, 0.93 nM 1,2-dichloroethane, 0.62 nM o-xylene, 0.57 nM m,p-xylene, 0.51 nM p-dichlorobenzene, 0.35 nM trichloromethylene. did not depend on rainfall intensity, temporal variation their was similar that gas-phase concentrations. The dissolution CHs MAHs into rainwater, however, larger than expected at ground temperature-corrected Henry's law constants. A simple below-cloud scavenging model, which developed by Levine Schwartz (Atmos. Environ. 16 (1982) 1725) could explain independence intensity but enhanced rainwater. results this study indicate estimated concentrations, based equilibrium, considerably underestimate wet-deposition fluxes onto ground.