Atmospheric H2O2 field measurements in a tropical environment: Bahia,Brazil |
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| Institution: | 2. Institute of Spectrochemistry and Applied Spectroscopy (ISAS) P.O. Box 10 13 52, D-4600 Dortmund 1, F.R.G.;1. Instituto de Química, Universidade Federal da Bahia (UFBa) Campus Universitário da Federaçao s/n, 40210 Salvador, Ba, Brazil;1. Chemical Engineering Faculty, Sahand University of Technology, P.O.Box 51335-1996, Sahand New Town, Tabriz, Iran;2. Environmental Engineering Research Center, Sahand University of Technology, P.O.Box 51335-1996, Tabriz, Iran;3. Department of Chemistry, Technical University Berlin, Straße des 17.Juni 124, 10623 Berlin, Germany;1. Cain Department of Chemical Engineering, Louisiana State University, 110 Chemical Engineering, South Stadium Rd., Baton Rouge, LA 70803, USA;2. Department of Land, Air and Water Resources, University of California, Plant and Environmental Science Bldg. 1110, One Shields Ave., Davis, CA 95616, USA |
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| Abstract: | Concentrations of H2O2 in atmospheric gas and liquid phases were determined for the first time in the tropical Southern Hemisphere. Measurements were carried out in the Salvador area, Bahia, 13°S, 38°W) both at the seaside and 500 m away from it as well as at 270 km inland, in a rural area, during March–April 1988. Gaseous H2O2 was collected by cryogenic and rain by wet only sampling. Analyses were performed with the peroxyoxalate chemiluminescence method, employing a compact field apparatus. The measured gas phase concentrations ranged from 0.2 to 3.9 ppbv compared to 0.01-0.6 ppbv obtained from measurements with similar methodology in Dortmund (51°30'N, 7°30'E), F.R.G, during summer. The corresponding concentration ranges in rainwater are 0.9-6.8 ppmw (Bahia) and 0.1–2.2 ppmw (Dortmund, summertime). Gas/liquid H2O2 equilibrium during rain events is only attained at precipitation rates below 1 mm h?1. |
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