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Researchers in the University of Toronto chemistry have put in evidence
ambient air collected in Toronto particle pollution from
Quebec and even the Sahara thanks to the use of laser technology.
Greg Evans, professor of chemical engineering and applied chemistry department
the University of Toronto, and his team, collected thanks to their
device ambient air flowing in along College Street
the university. They have found pollutants from a forest fire occurred
in Quebec, and more surprising, particles from a storm of
sand in the Sahara. This is a real detective work: having
learned of the fire at Quebec researchers were able
identify the particles originating from the event. Similarly they could
periple trace the dust of the Sahara, crossing the Atlantic
to Mexico and then back up to the North Toronto.
The equipment used for this research integrates a mass spectrometer has
laser ablation. The device collects the surrounding air and the particles
prisoners are accelerated. Two lasers with sensors detect
then they burst forth at the speed of a bullet. Once the speed
calculated, a third laser power is greater for clicks
pulverize particle. The fragments describe an aerial tube. The
most slight molecules take less time to cross the tube. They
are analyzed by chemists and deliver the chemical signature of the
polluting particle studied.
Greg Evans from now works on the development of a library
bringing together the different signatures of potential pollutants. He will be
so now possible thanks to such process to directly identify the type
pollutant in the ambient air without knowing the source.

contacts:
- Greg Evans, Department of Chemical Engineering and Applied Chemistry - such
: (+ 1) 416 978 1821 - Email: evansg@chem-eng.utoronto.ca
Sources: Website of the University of Toronto, under News @ UofT, Article
"Globetrotting pollutants turn up on Toronto streets" publishes l19 / 10 / 2004,
Author Nicolle Wahl, link:
http://www.news.utoronto.ca/bin6/041019-574.asp
Editor: Renaud Didelot TORONTO,
att-scientifique@consulfrance-toronto.org


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