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Université de Fribourg

On source identification and alteration of single diesel and wood smoke soot particles in the atmosphere; an X-ray microspectroscopy study

Vernooij, Martine G. C. ; Mohr, M. ; Tzvetkov, G. ; Zelenay, V. ; Huthwelker, T. ; Kaegi, R. ; Gehrig, R. ; Grobéty, Bernard

In: Environmental Science and Technology, 2009, vol. 43, no. 14, p. 5339–5344

Diesel and wood combustion are major sources of carbonaceous particles in the atmosphere. It is very hard to distinguish between the two sources by looking at soot particle morphology, but clear differences in the chemical structure of single particles are revealed by C(1s) NEXAFS (near edge X-ray absorption fine structure) microspectroscopy. Soot from diesel combustion has a dominant spectral...

Université de Fribourg

A thermophoretic precipitator for the representative collection of atmospheric ultrafine particles for microscopic analysis

Lorenzo, R. ; Kaegi, R. ; Gehrig, R. ; Scherrer, L. ; Grobéty, Bernard ; Burtscher, Heinz

In: Aerosol Science and Technology, 2007, vol. 41, no. 10, p. 934 - 943

In this article, the potential of a thermophoretic sampling device to derive quantitative particle size distributions and number concentrations of aerosols based on microscopic single particle analysis is explored. For that purpose a plate-to-plate thermophoretic precipitator to collect ultrafine atmospheric particles for TEM (transmission electron microscopy) analysis has been calibrated and...

Université de Fribourg

Particle emissions of a railway line determined by detailed single particle analysis

Lorenzo, Ronny ; Kaegi, R. ; Gehrig, R. ; Grobéty, Bernard

In: Atmospheric Environment, 2006, vol. 40, no. 40, p. 7831-7841

The goal of this study was to identify and quantify particles emitted from railway traffic. For that purpose PM10 samples were collected near a busy railway line using a wind direction and speed controlled sampling equipment consisting of five devices. Measurements taken perpendicular to the railway lines at 10, 36 and 120 m distance enable an identification and separation of particles caused by...