Unsicherheiten bei der Abscheidung von Schwebstaub an Filtern

Summary Different samples of airborne particulate matter collected successively by highly effective aspirators were analysed for Al, Si, S, K, Ca and Fe by XRF. The results show that there is not only a distinct alteration of the content during short intervals of time, but also a remarkable change in the quantitation of the particular elements in the dust composition. By synchronous aspiration in a distance of 1 m it was possible to show that the local distribution is also different. In the experiments to be reported there are differences greater then 10% in respect of particular elements. In comparison with this, the decomposition of the dust during the aspiration is not significant. But it has to be taken into consideration if only parts of the filter disk are used for analysis.