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Empa X-ray expert 'decodes' diesel soot
Date:8/6/2012

Soot particles are dangerous there is nothing new in this knowledge. But what is it that makes fine particulates dangerous? Is it only diesel soot from vehicle engines? Does the danger also come from wood-burning stoves in holiday chalets? Or even from grease-laden fryer fumes from the restaurant around the corner? For a long time, these questions have been a hard nut for science to crack. Indeed, fine soot particles were collected in filters and their chemical components were analysed. Yet the question remained: what precisely is the source of the danger? Is it the soot particles themselves that make people ill? Or is it toxic chemicals the soot carries with it like a wet sponge?

Not all smoke is created equal

The Norwegian Institute of Public Health wanted to investigate this matter and asked Empa scientist Artur Braun for support. Before joining Empa, Braun had worked at the University of Kentucky and there, in 2002, he analyzed soot particles for the first time on a synchrotron using soft X-rays. Result: diesel particles that have been "born" in the engine under high pressure and immense heat have a graphite structure this is clearly visible under X-ray light. In the case of soot particles from wood fires, which have been generated under mild atmospheric conditions, this graphite structure is absent. The functional groups are also different: diesel soot was found to contain carboxyl groups such as those occurring in formic and acetic acid molecules; in the wood smoke, Braun found hydroxyl groups as in ethanol and methanol. There is thus a fine difference between smoke and smoke.

Analyse separately, fight together

The Norwegian toxicologists then went a step further and asked Braun's colleagues at the University of North Dakota to isolate the soot particles from the adherent chemical toxic substances using solvents. Braun then analysed the components individually under X-ray light: first the "bare" soot p
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Contact: Dr Artur Braun
arthur.braun@empa.ch
41-587-654-850
Swiss Federal Laboratories for Materials Science and Technology (EMPA)
Source:Eurekalert

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