Study of metal aerosol systems as a sink for atmospheric SO2 |
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| Authors: | Harald Berresheim Wolfgang Jaeschke |
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| Institution: | (1) Zentrum für Umweltforschung der J.-W.-Goethe-Universität, Robert-Mayer-Str. 9-11, D-6000 Frankfurt am Main 1, F.R.G.;(2) Present address: Department of Oceanography, Florida State University, 32306 Tallahassee, FL, U.S.A. |
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| Abstract: | The chemical removal of SO2 in the presence of different aerosol systems has been investigated in laboratory experiments using a dynamic flow reactor. The aerosols consisted of wetted particles containing one of the following substances: MnCl2, Mn(NO3)2, MnSO4, CuCl2, Cu(NO3)2, CuSO4, FeCl3, NaCl. The SO2 removal rate R was measured as a function of the SO2 gas phase concentration (SO2)g, the spatial metal concentration CMe, and the relative humidity rH in the reactor. A first-order dependence with regard to (SO2)g was observed for each type of aerosol. For the Mn(II) and Cu(II) aerosols R was found to be a non-linear function of CMe except for MnSO4 and Cu(NO3)2 particles. The removal rate showed a significant increase with the relative humidity particularly when rH was close to the deliquescence point of the wetted particles. Among the Mn(II) and Cu(II) aerosols investigated Mn(NO3)2 was found to be most efficient for the chemical removal of SO2 at atmospheric background conditions, especially in haze and fog droplets. The results further indicate that the catalytic oxidation of S(IV) in such aerosol systems may be as efficient as its oxidation by H2O2 in cloud water. |
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| Keywords: | Sulfur dioxide removal aerosol transition metal hydrogen peroxide flow reactor |
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