KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Seasonal variation and source analysis of carboxylic acids in PM2.5in the urban area of Chongqing | |
Gong, Yingtao1,2; Tian, Mi2; Fu, Min1; Yang, Fumo2 ; Li, Yunchun3
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| 2016 | |
| 摘要 | This study reported the seasonal and spatial distribution of carboxylic acids in PM2.5at four sampling sites in the urban area of Chongqing. The concentrations of 16 saturated fatty acids, 21 unsaturated fatty acids and 8 dicarboxylic acids were determined using Gas Chromatography-Mass Spectrometry (GC-MS). The seasonal variations and the sources of these species were also discussed. The results showed that the average daily concentration of total carboxylic acids was 130.42~1953.79 ng·m-3. The concentration of fatty acids and dicarboxylic acids at each sampling site were significantly different. Unique seasonal variations of fatty acids were observed and their concentrations were high in summer (961.97 ng·m-3) and low in winter (49.24 ng·m-3). Saturated fatty acids showed the significance of the even carbon number acids to the odd carbon number acids with the most abundance of C16(palmitic acid) and C18(stearic acid). Dicarboxylic acids also showed strong seasonal variations. However, the dicarboxylic acids showed the highest concentration in winter (432.04 ng·m-3) and the lowest in spring (64.57 ng·m-3). Malonic acid, succinic acid and glutaric acid were predominant in dicarboxylic acids. The study suggested that bacterial activities and cooking oil fume were the major contributors to fatty acids and dicarboxylic acids were influenced by photochemical activities. © 2016, Science Press. All right reserved. |
| DOI | 10.13671/j.hjkxxb.2015.0790 |
| 发表期刊 | Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae
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| ISSN | 02532468 |
| 卷号 | 36期号:7页码:2332-2343 |
| 语种 | 中文 |
