Absorption and desorption of dichloromethane vapor by water drops in air. An experimental test of scavenging theory |
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| Authors: | S. Lopez J. H. Topalian S. K. Mitra D. C. Montague |
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| Affiliation: | (1) Department of Atmospheric Sciences, University of California, 90024 Los Angeles, CA, U.S.A.;(2) Present address: Department of Atmospheric Science, University of Wyoming, Box 3038, 82071 Laramie, WY, U.S.A.;(3) Present address: Centro de Ciencias de la Atmosfera, Circuito Exterior, Ciudad Universitaria, CP 04510 Mexico, DF, Mexico;(4) Present address: Hughes Aircraft Co., 500 Superior Ave., PO Box H, 92658-8903 Newport Beach, CA, U.S.A.;(5) Present address: Institut für Meteorologie, Johannes Gutenberg Universität, D-6500 Mainz, Federal Republic of Germany |
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| Abstract: | An experimental study of the scavenging of dichloromethane vapor by water drops falling at terminal velocity, has been carried out in the UCLA precipitation shaft, in order to test the predictions of theoretical washout models. Whereas good agreement between theory and experiment was found for drops of radius 0.332 mm, computed gas uptake rates for 1.253 and 2.21 mm radius drops were much slower than those measured, just as reported previously for the washout of both sulfur dioxide and acetaldehyde. An analysis shows that theory can be reconciled with all of the experimental data by replacing the compound specific aqueous phase Fickian molecular diffusion coefficient used in the theory, by an  effective diffusivity , having a constant value, (3×10-4 cm2 s-1), independent of the physical and chemical nature of the absorbed species, for all drops of equivalent radii greater than 0.9 mm. |
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| Keywords: | Dichloromethane precipitation scavenging washout wet deposition |
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