Abstract
Considering the dependence of the deposition velocity on the particle-size (cf. Fig. 6.2), exact knowledge of the concentration distribution over the size-fractions is an essential precondition for a correct determination of dry deposition. The relative contributions of the individual size fractions to the total flux vary from element to element, since the concentration distributions can be quite different. Here, the origin plays an important part. Elements of predominantly anthropogenic origin, for instance Cd or Pb, show a rise in the concentration in air with decreasing aerodynamic diameter. This is the outcome of the long-range transport. On the other hand, elements of essentially geogenic origin, such as Ca and Fe, exhibit a contrary behaviour: the concentration decreases with diminishing diameter; nearby sources markedly contribute to the element content in the particulate phase. These facts are illustrated in Fig. 9.1, where the differential trace element concentrations are plotted with decreasing particle diameter from left to right according to the six fractions of the impactor used (cf. Sect. 5.1.3). The diagram also demonstrates the excellent detection sensitivity of the applied procedures which is in the order of pg/m3.
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Michaelis, W. (1997). Trace Elements in Size-Fractionated Particulates: Concentrations and Dry Deposition into a Forest Ecosystem. In: Air Pollution. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60456-0_9
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DOI: https://doi.org/10.1007/978-3-642-60456-0_9
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