The aerosols has been collected by sample of high-volume sampler in Beijing,and the concentrations of n-alkane in aerosol samples were determined via GC-MS.The n-alkane homolog was from C10 to C33.The total concentrations of n-alkanes in aerosol of Beijing varied from 176.22 to 5 410.2 ng/m3 in PM10 and from 77.89 to 3 138.9 ng/m3 in PM2.5,respectively,during the year and were higher in winter time than those in the other three season.The carbon numbers of main peaks of n-alkanes were 25,27,29 in spring,and 27,29,31 in summer,27,29 in autumn,25 in winter for PM10 samples,respectively.CPI in four seasons was close to 1.0,which indicated that n-alkanes were mainly from combustion of fossil fuel like petroleum,partially from advanced plants.
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