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More than eighty kinds of polynuclear aromatic hydrocarbons (PAHs) have been identified in airborne particulates. Not a few PAHs have been recognized as carcinogens. Among these, benzo [a] pyrene (B[a]P), which is one of the strongest carcinogens, has been regarded as an important analytical target in airborne particulates. The analytical techniques utilized to determine PAHs include gas chromatography, mass spectrometry, thin-layer chromatography, liquid chromatography, fluorescence spectrometry and combinations of these techniques. In most cases, the first analytical procedure is started by conventional solvent extraction of the organic compounds from the airborne particulate sample collected on a glass-fiber filter. An ultrasonator was effectively used to reduce extraction time."2 Vacuum sublimation was also proposed as an alternative rapid extraction method of PAHs in airborne particulate matter.3 These preliminary treatments still take more than 40 or 50 min. Furthermore, these off-line extraction methods are to some extent subjected to sample loss and/or contamination from the glass-wares, solvents and the laboratory atmosphere. On the other hand, a gas-phase thermal desorption was proposed as a rapid, sensitive and contaminationfree sample preparation method.4 By this solvent-free method, the whole analytical procedure was drastically simplified, although the off-line thermal desorption was still adopted. Recently, the authors proposed a new automated thermal desorption system for gas chromatography of volatile components in environmental and polymeric samples.5 By this system, the volatile components in sample matrices stripped dynamically by on-line thermal desporption were followed by gas chromatographic separation. In the present work, the automated thermal desorption system was applied to make rapid determination of B[a]P in airborne particulates. The

Determination of Benzo [a] pyrene in Airborne Particulates by Automated Thermal Desorption Gas Chromatography