Gas chromatography

Polycyclic aromatic hydrocarbons Soot and air samples Liquid CO 2 extraction Summary The results of the analysis of polycyclic aromatic hydro-carbons (PAH) in soot and similar types of sample are often dependent on the extraction method applied, owing to carbonaceous substances present in these samples. The recoveries of three extraction methods, an ultrasonic ether, aSoxhlet toluene and a Soxhlet extraction with liquid CO 2 were compared for a typical soot sample. Additionally the CO 2 extraction was optimized with re-Spect to the necessary number of transfers during the extraction and the proper method to remove the CO 2 after extraction