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- W2017637847 abstract "Abstract The deposition of airborne Pb particulates has been experimentally investigated in different fields. Three fields with different surface conditions were selected for which the roughness sizes have been determined under neutral atmospheric conditions. A modified low-pressure Andersen impactor was used to determine the particle-size distribution. The sampler classifies particle size in ultra-fine range down to 0.08 μm aerodynamic diameter. The flux of particulate Pb was measured on the surfaces of: alfalfa leaves, real grass and soil under stable and unstable atmospheric conditions. Data from a meteorological tower were analysed to determine the standard deviation of horizontal wind direction from which the atmospheric stability class was determined. The deposition surfaces were wet-ashed with HNO 3 and analysed for Pb by atomic absorption spectrophotometry and the particulate fluxes were obtained. The particulate fluxes were also calculated from the size-distribution data and values of deposition velocity were obtained from two deposition models (Sehmel and Hodgson, 1978; El-Shobokshy and Sharaf El-Din, 1984). It is concluded that both surface roughness and atmospheric stability are the main controlling factors in particulate deposition, together with particle diameter. For unstable conditions, there was quite good agreement between measured and calculated particulate flux using both of the above theoretical models. For stable conditions, Sehmel and Hodgson's model failed to predict accurate fluxes because their model shows the independence of deposition velocity on atmospheric stability." @default.
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- W2017637847 date "1985-01-01" @default.
- W2017637847 modified "2023-09-27" @default.
- W2017637847 title "The dependence of airborne particulate deposition on atmospheric stability and surface conditions" @default.
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- W2017637847 doi "https://doi.org/10.1016/0004-6981(85)90203-3" @default.
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