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Extra resources for Advances in Environmental Engineering: Selected, Peer Reviewed Papers from the 2012 Global Conference on Civil, Structural and Environmental ... International
The 5th Mainland-Taiwan aresols Conference. 2-6 2008,93~99.  Jiang Y L, Hou X M, Zhuang G S, et al. 5 in Beijing and Shanghai, Journal of Atmospheric Chemistry, 62(3): 175-192(2009). , Chen S. 5 and PM10 aerosols in Beijing, China [J]. Atmospheric Research,84(2):169-181(2007). Liu. 5 in Beijing[J]. Environment science,29(6):1139-1145(2009). Zhang. Guo. Wang. Source appointment and seasonal variations of fatty acids in particulate matter of Beijing. Environment science in China. 29(7):673~678(2009).
The amount of coal buring is large in northern China during winter heating, but this standard does not include coal emissions, and contribution of coal buring to fatty acids can not be ignored. Other studies refer to the calculation method of carbon priority index in fatty acids, the method evolves from n-alkanes and sums up the corresponding threshold range. 5 to 5, the cooking progress is the main source; When the CPI is more than 5, the source of coal buring is the dominance. 5 to 5 during April and May.
By adding n-hexane and transferring to a separating funnel, the solution was added the acetonitrile as demulsifier and repeated the extraction three times with high purity water. Finally the upper organic phase was taken before being concentrated to 1ml with nitrogen blowing instrument. The samples were analysed by GC-MS after pretreatments, the test conditions are been shown in Table 1. 4 Quality assurance and quality control In this study, The NIST standard organic mass spectral library was used to search, combined with the retention time of standard compounds for qualitative analysis and the use of the external standard curve of at least five concentration levels for quantitative analysis.