Presentation at the Particulates meeting in Brussels jan 2003 Anders Christensen / Roger Westerholm Department of Analytical chemistry Anders Christensen and Roger Westerholm Dept. of Analytical chemistry, Stockholm university

Determination of PAH n Ultrasonic extraction with acetone –5 ml solvent for 10 min n Solvent evaporation –reducing solvent volume and change to toluene n Solid phase extraction, SPE –100 mg Si –elution of a 2 ml fraction containing alifatics and PAH n Analysis on LC-GC-MS Anders Christensen / Roger Westerholm Department of Analytical chemistry

LC-GC-MS system PTV injector MS HPLC-pump UV-detector HPLC autosampler Waste Backflush valve LC-column Transfer line GC injection valve Anders Christensen / Roger Westerholm Department of Analytical chemistry

SRM 1649a Urban dust (National Institute of Standards & Technology, NIST) Anders Christensen / Roger Westerholm Department of Analytical chemistry

SRM 2975 Diesel Particulate Matter (National Institute of Standards & Technology, NIST) X 10 Anders Christensen / Roger Westerholm Department of Analytical chemistry

Multivariate analysis, Round Robin results To try and see why there are differences in the results between the different labs, we have tryed to do a multivariate analysis, PCA of the data. The results of this experiment are not conclusive since there is not enough data, but there might be some indications that could be intresting to discuss. Anders Christensen / Roger Westerholm Department of Analytical chemistry

Scores plot, UDC results UDC LAT MTC EMPA Shell TUG VTT Anders Christensen / Roger Westerholm Department of Analytical chemistry

Loadings plot, UDC results Anders Christensen / Roger Westerholm Department of Analytical chemistry

Scores plot, EUDC results EMPA TUG VTT MTC Shell LAT Anders Christensen / Roger Westerholm Department of Analytical chemistry

Loadings plot, EUDC results Anders Christensen / Roger Westerholm Department of Analytical chemistry

Particle mass VS humidity Anders Christensen / Roger Westerholm Department of Analytical chemistry

WP 500 Activities n Tasks - PAH analysis of samples from –LDV tests –Alternative fuels –Advanced engines & aftertreatment –Oil consumption n We have received samples from AVL, Volvo and EMPA n The analysis of samples will probably begin during the following weeks n Tests at MTC will be performed in February n We have to decide which samples that are most important to analyse Anders Christensen / Roger Westerholm Department of Analytical chemistry