Atmospheric concentration characteristics and gas-particle partitioning of PCBs in a rural area of eastern Germany

TitleAtmospheric concentration characteristics and gas-particle partitioning of PCBs in a rural area of eastern Germany
Publication TypeJournal Article
Year of Publication2007
AuthorsMandalakis, M, Stephanou EG
JournalEnvironmental Pollution
Volume147
Issue1
Pages211 - 221
KeywordsAtmosphere, Gas-particle partitioning, Germany, Polychlorinated biphenyls, Volatilization
Abstract

Atmospheric concentrations of polychlorinated biphenyls (PCBs) were measured in 14 successive daytime and nighttime air samples collected from Melpitz, a rural site in eastern Germany. The average total concentration of PCBs was 110 ± 80 pg m-3 and they were predominately present in the gas phase (∼95%). Composition of individual congeners closely resembled those of Clophen A30 and Aroclor 1232. Partial vapor pressures of PCBs were well correlated with temperature and the steep slopes obtained from Clausius-Clapeyron plots (-4500 to -8000) indicated that evaporation from adjacent land surfaces still controls the atmospheric levels of these pollutants. Particle-gas partitioning coefficients (KP) of PCBs were well correlated with the respective sub-cooled vapor pressures (PLo), but the slopes obtained from log KP versus log PLo plots (-0.16 to -0.59) deviated significantly from the expected value of -1. Overall, gas-particle partitioning of PCBs was better simulated by Junge-Pankow than octanol/air partition coefficient-based model. © 2006 Elsevier Ltd. All rights reserved.

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