EPJ Web of Conferences
Volume 9, 2010ERCA 9 – From the Global Mercury Cycle to the Discoveries of Kuiper Belt Objects
|Page(s)||35 - 42|
|Published online||21 December 2010|
Atmospheric emissions and long-range transport of persistent organic chemicals
Institute for Chemical and Bioengineering, ETH Zürich, 8093 Zurich, Switzerland
a e-mail: firstname.lastname@example.org
Persistent organic chemicals include several groups of halogenated compounds, such as polychlorinated biphenyls (PCBs), polybrominated diphenylethers (PBDEs), and polyfluorinated carboxylic acids (PFCAs). These chemicals remain for long times (years to decades) in the environment and cycle between different media (air, water, sediment, soil, vegetation, etc.). The environmental distribution of this type of chemicals can conveniently be analyzed by multimedia models. Multimedia models consist of a set of coupled mass balance equations for the environmental media considered; they can be set up at various scales from local to global. Two applications of multimedia models to airborne chemicals are discussed in detail: the day-night cycle of PCBs measured in air near the surface, and the atmospheric long-range transport of volatile precursors of PFCAs, formation of PFCAs by oxidation of these precursors, and subsequent deposition of PFCAs to the surface in remote regions such as the Arctic.
© Owned by the authors, published by EDP Sciences, 2010
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