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[Determination of volatile hydrocarbon in atmosphere by two-dimensional capillary column gas chromatography]
Mu-Lin Wang1, Hong-Bing Cheng, Zhao-Yang Meng
1Chinese Academy of Meteorological Sciences, Beijing 100081, China. mlwang@public.bta.net.cn
Abstract:
Fifty-seven volatile hydrocarbons (VHCs) (C3-C10) in the atmosphere have been determined by two-dimensional capillary column gas chromatography. The samples were preconcentrated using adsorption/two stages of thermal desorption. The samples were analysed by dual columns (PLOT, 50 m x 0.32 mm i.d. x 8 microns, Al2O3/Na2SO4; HP-1, 50 m x 0.22 mm i.d. x 0.5 micron, methyl silicone)/dual flame ionization detectors(FID). The qualitative stability of the method is good. The relative standard deviation of the peak area response is smaller than 20%. The correlation coefficients(r2) for linear regression equations for PLOT and HP-1 columns were 0.9990 and 0.9997 respectively. Analytical period was 48 min. The 182 atmospheric samples from the Ecological Station of Changshu, Jiangsu were measured. The results show that the method is accurate, rapid and practically useful for the determination of the VHCs in atmosphere.