Abstract
Branched iso- and anteiso-alkanes were conjointly used, with n-alkanes and PAHs, as specific molecular markers to trace environmental tobacco smoke (ETS) in particle-sized aerosols collected in the indoor and outdoor urban atmosphere. GC/MS and GC-FID were used for the de termination of iso-, anteiso-, and n-alkanes and PAHs. The branched alkanes (ranging from C29 to C33) were detected only in particles in the accumulation range mode (<1.5 μm) in both indoor and outdoor samples. The concentrations of iso- and anteiso-alkanes in the indoor aerosols (0.75−8.53 ng/m3) were higher than those measured in outdoor samples (0.77−1.51 ng/m3). The indoor aerosol pattern of iso-, anteiso-, and their calculated diagnostic concentration ratios were characteristic for ETS. The compound distribution pattern of indoor n-alkanes (ranging from C21 to C33) was of biogenic origin, and the use of odd-to-even predominance running ratio curves indicated their cigarette smoke origin. The corresponding outdoor pattern and concent...
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