Abstract
This paper describes the sampling and analysis of air for mixtures of benzene, toluene and xylene vapors. The application of a molecular sieve prefilter to remove water vapor and a silica gel adsorption tube for the collection of the hydrocarbon was investigated. The development of a method for the extraction of aromatic hydrocarbons from silica gel and their subsequent estimation by gas chromatography is reported. The method is sufficiently sensitive to permit accurate measurement at 10% of the MAC level.