Vapor-particle partitioning of hydrocarbons in Western Mediterranean urban and marine atmospheres |
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Authors: | Joan Albaigés Josep M Bayona Pilar Fernandez Joan Grimalt Antoni Rosell Rafel Simó |
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Institution: | (1) Environmental Chemistry Department, C.I.D. (C.S.I.C.), Jordi Girona 18-26, E-08034 Barcelona, Spain |
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Abstract: | An analytical procedure is described for a comprehensive determination of the composition of hydrocarbons in the atmosphere, based on: (a) aerosol filtration and subsequent adsorption of the vapor phase onto active charcoal and polyurethane foam; (b) GPC and HPLC fractionation of the extracts, and (c) analysis of the fractions by GC-MS under EI and NICI modes. Special emphasis is placed onn-alkanes, PAHs and their oxygenated derivatives.The characterization of samples collected in a coastal urban area (Barcelona city), and far away over the Western Mediterranean, at sea level and at 1100 m of altitude, revealed significant changes in the aerosol composition, mainly attributed to initial vapor-particle partitioning processes, influenced by ambient temperature variations, and to others taking place during long-range atmospheric transport, related with the different compound photoreactivities and with an unexplained source-decoupling phenomenon. |
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Keywords: | hydrocarbons PAHs urban aerosols marine aerosols vapor-particle partitioning |
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