中文关键词正构烷烃糖类化合物来源PM_2.5泰安市 英文关键词n-alkanessaccharidessourcesPM_2.5Taian City

作者	单位	E-mail
衣雅男	聊城大学环境与规划学院, 聊城 252000	yiyanan6902@163.com
侯战方	聊城大学环境与规划学院, 聊城 252000 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安 710061	houzhanfang@lcu.edu.cn
杨千才	聊城市环境监测中心, 聊城 252000
刘晓迪	聊城大学环境与规划学院, 聊城 252000
李政	聊城大学环境与规划学院, 聊城 252000
孟静静	聊城大学环境与规划学院, 聊城 252000 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安 710061
燕丽	环境保护部环境规划院, 北京 100012
魏本杰	聊城大学环境与规划学院, 聊城 252000
伏梦璇	聊城大学环境与规划学院, 聊城 252000

中文摘要 为探讨泰安市夏季PM_2.5中正构烷烃和糖类的化学组成及其来源，于2016年7~8月进行PM_2.5样品采集，对泰安市正构烷烃及糖类进行分析，并利用主成分分析-多元线性回归模型（PCA-MLR）和后向轨迹模型对污染物进行来源解析.结果表明，2016年泰安市夏季PM_2.5质量浓度为（37.2±11.5）μg·m^-3，是我国环境空气质量一级标准（GB 3095-2012，35μg·m^-3）的1.1倍.其中，正构烷烃质量浓度为（83.3±34.7）ng·m^-3，碳优势指数（CPI）为1.83，植物蜡烷烃贡献率（% WaxC_n）为34.7%~69.4%，表明植物蜡是泰安市夏季正构烷烃的主要来源.糖类化合物的质量浓度为（73.4±46.6）ng·m^-3，其中左旋葡聚糖、半乳聚糖和甘露聚糖是主要的糖类组分，分别占糖类化合物总浓度的64.0%、7.1%和6.3%，表征生物质燃烧对泰安市糖类具有重要贡献.由PCA-MLR模型结果表明，泰安市夏季PM_2.5中正构烷烃和糖类化合物主要来自植物蜡、化石燃料燃烧和生物质燃烧.后向轨迹分析表明，泰安市夏季正构烷烃和糖类污染物主要来自山东本地源和南方内陆地区. 英文摘要 To investigate the variations and sources of n-alkanes and sugars in Taian City during summer, PM_2.5 samples were collected from July 22 to August 19, 2016. The identified n-alkane and sugar sources were investigated using a principal component analysis (PCA) multiple linear regression (MLR) model and a backward trajectory model. The results showed that the mass concentrations of PM_2.5 during summer were (37.2±11.5) μg·m^-3. The mass concentrations of n-alkanes were (83.3±34.7) ng·m^-3, the carbon preference index (CPI) was 1.83, and the relative contribution of wax n-alkanes was 34.7%-69.4%, suggesting that contributions from terrestrial plants were more significant in Taian City. The results showed that the mass concentrations of sugars in Taian City during summer were (73.4±46.6) ng·m^-3. Levoglucan, galactosan, and mannosan were the main saccharides, accounting for 64.0%, 7.1%, and 6.3% of the total concentrations of sugars, respectively, indicating that biomass burning is much more significant in Taian City. The results of the PCA-MLR model suggested that n-alkanes and sugars in Taian City during summer were mostly from terrestrial plants, coal burning and biomass burning. The backward trajectory model showed that the pollution mostly came from the native sources of Shandong province and the inland cities in the south.

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