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The paper presents the application of a method based on coupled gas chromatography-mass spectrometry, using an isotopically labelled internal standard for the quantitative analysis of benzene (B), toluene (T), ethyl benzene (E), and o-, m-, p-xylenes (X). Their atmospheric concentrations were determined based on short-term sampling, in different sites of Cluj-Napoca, a highly populated urban centre in N-W Romania, with numerous and diversified road vehicles with internal combustion engines. The method is relatively inexpensive and simple and shows good precision and linearity in the ranges of 7–60  μ g/m 3  (B), 13–90  μ g/m 3  (T), 7–50  μ g/m 3  (E), 10–70  μ g/m 3  (X-m,p), and 20–130  μ g/m 3  (X-o). The limits of quantitation/detection of the method LOQ/LOD are of 10/5  μ g/m 3  (Xo), 5/3  μ g/m 3  (B, E, X-m,p), and of 3/1  μ g/m 3  (T), respectively.

Determining the Levels of Volatile Organic Pollutants in Urban Air Using a Gas Chromatography-Mass Spectrometry Method