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Relative decay index and sources of polycyclic aromatic hydrocarbons



Relative decay index and sources of polycyclic aromatic hydrocarbons



Atmospheric Environment 20(3): 439-446



An optimized method for the analysis of polycyclic aromatic hydrocarbons (PAH) in atmospheric aerosols with short sampling times (1 h) has been used to determine the daily variations of PAH in the atmosphere. Of the various physicochemical parameters controlling the disappearance of PAH, the most important seem to be the thermic dependence and the chemical reactions with gaseous pollutants (NOx, O3, HNO3, OH). The RDI is used to identify the different sources of urban pollution: domestic heating, vehicle traffic (petrol and diesel), refineries, foundries, incinerators and power stations (coal, gas and oil) and to quantify the results for standard conditions. The characteristic concentration ratios from each source are often different from those in the literature, where the data are based on long sampling times and are affected by PAH reactivity differences. The results obtained are parameters for setting up a mathematical model for calculating concentrations of PAH at any receptor site.

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Accession: 006303850

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DOI: 10.1016/0004-6981(86)90083-1


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