泰安市夏季PM2.5中正构烷烃和糖类化合物的化学组成及其来源  

Chemical Compositions and Sources of n-Alkanes and Saccharides in PM2.5 from Taian City During the Summer

作　　者：衣雅男 侯战方 杨千才[3] 刘晓迪[1] 李政 孟静静[1,2] 燕丽[4] 魏本杰 伏梦璇 YI Ya-nan;HOU Zhan-fang;YANG Qian-cai;LIU Xiao-di;LI Zheng;MENG Jing-jing;YAN Li;WEI Ben-jie;FU Meng-xuan(School of Environment and Planning,Liaocheng University,Liaocheng 252000,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China;Liaocheng Environmental Monitoring Center,Liaocheng 252000,China;Chinese Academy for Environmental Planing,Beijing 100012,China)

机构地区：[1]聊城大学环境与规划学院,聊城252000 [2]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 [3]聊城市环境监测中心,聊城252000 [4]环境保护部环境规划院,北京100012

出　　处：《环境科学》2020年第3期1045-1055,共11页Environmental Science

基　　金：国家自然科学基金项目(41505112,41702373);山东省自然科学基金项目(BS2015HZ002);黄土与第四纪地质国家重点实验室开放基金项目(SKLLQG1504);大学生创新创业项目(CXCY2017046)。

摘　　要：为探讨泰安市夏季PM2.5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PM2.5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PM2.5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(%WaxCn)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PM2.5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.To investigate the variations and sources of n-alkanes and sugars in Taian City during summer, PM2.5samples 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 PM2.5 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.

关 键 词：正构烷烃 糖类化合物 来源 PM2.5 泰安市 

分 类 号：X513[环境科学与工程—环境工程]