title: [Pollution characteristics of organic acids in atmospheric particles during haze periods in autumn in Guangzhou].
abstract: Total suspended particles (TSP), collected during a typical haze period in Guangzhou, were analyzed for the fatty acids (C12-C30) and low molecular weight dicarboxylic acids (C3-C9) using gas chromatography/mass spectrometry (GC/MS). The results showed that the concentration of total fatty and carboxylic acids was pretty high during the haze episode. The ratios of fatty acids and carboxylic acids in haze to those in normal days were 1.9 and 2.5, respectively. During the episode of the increasing pollution, the fatty acids and carboxylic acids at night (653 ng x m(-3)) was higher than that (487 ng x m(-3)) in days. After that, the level of fatty acids and carboxylic acids in days (412 ng x m(-3)) was higher than that (336 ng x m(-3)) at night. In general, the time-series of fatty acids and carboxylic acids was similar to that of the air particle and carbonaceous species, however, the trend of the ratio of fatty acids and carboxylic acids to organic carbon was opposite to that of air particle and carbonaceous species. This ratio decreased with the increase of the concentration of air particle and after the night of 27th, the ratio increased with the decrease in the concentration of air particle. The results showed that haze pollution had a significant inhibitory effect on the enrichment of fatty and carboxylic acids. Based on the ratio of malonate to succinate (C3/C4), it could be found that primary sources contribute more to the atmospheric fatty and carboxylic acids during the autumn haze pollution periods in Guangzhou.
authors.affiliation: College of earth science, University of Chinese Academy of Sciences, Beijing 100049, China. tanjh@ucas.ac.cn
authors.forename: Ji-hua
authors.initials: JH
authors.lastname: Tan
authors.forename: Jing-ping
authors.initials: JP
authors.lastname: Zhao
authors.forename: Jing-chun
authors.initials: JC
authors.lastname: Duan
authors.forename: Yong-liang
authors.initials: YL
authors.lastname: Ma
authors.forename: Ke-bin
authors.initials: KB
authors.lastname: He
authors.forename: Fu-mo
authors.initials: FM
authors.lastname: Yang
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D000397:Air Pollution / Q000032:analysis*; D001272:Atmosphere; D002681:China; D003998:Dicarboxylic Acids / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D005227:Fatty Acids / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis; D010316:Particle Size; D012621:Seasons
chemical_list: D000393:Air Pollutants; D003998:Dicarboxylic Acids; D005227:Fatty Acids; D009930:Organic Chemicals