重庆白市驿PM_(2.5)中糖类特征及来源  

Characteristics and sources of saccharides in PM_(2.5)in Baishiyi over Chongqing,China

作　　者：傅铃雁 刘彬杨 成思豪 张舒涵 邓小康 苏靖柯 徐成华[1,2] 傅平青 刘頔 任红 FU Lingyan;LIU Binyang;CHENG Sihao;ZHANG Shuhan;DENG Xiaokang;SU Jingke;XU Chenghua;FU Pingqing;LIU Di;REN Hong(College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225;Air Environmental Modeling and Pollution Controlling Key Laboratory of Sichuan Higher Education Institutes,Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province,Chengdu 610225;Institute of Surface-Earth System Science,Tianjin University,Tianjin 300072;Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029)

机构地区：[1]成都信息工程大学资源环境学院,成都610225 [2]大气环境模拟与污染控制四川省高校重点实验室,成都平原城市气象与环境四川省野外科学观测研究站,成都610225 [3]天津大学地球系统科学学院,天津300072 [4]中国科学院大气物理研究所,北京100029

出　　处：《环境科学学报》2024年第11期28-38,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金青年科学基金项目(No.42007188);四川省自然科学基金项目(No.2022NSFSC1000);成都信息工程大学引进人才科研启动经费项目(No.KYTZ202133);成都信息工程大学校级大学生创新创业训练计划项目(No.202310621380)。

摘　　要：大气有机颗粒物是引起大气污染的重要成分之一,而四川盆地典型山地城市大气PM_(2.5)的有机分子示踪物组成及其特征研究相对国内其它热门城市较少.为探究四川盆地典型山地城市大气PM_(2.5)中糖类化合物的特征,利用气相色谱-质谱联用(GC-MS)检测了重庆市白市驿不同季节PM_(2.5)昼夜样品中12种糖类化合物的浓度水平,包括脱水糖、初级糖和糖醇.结果表明:①重庆市白市驿大气PM_(2.5)中脱水糖占总糖的比例超过85%,其中,左旋葡聚糖占比最大.②总糖浓度为(264±208)ng·m^(-3),且白天浓度((226±198)ng·m^(-3))低于晚上浓度((307±212)ng·m^(-3)).③总糖浓度呈现季节差异,夏季((52.5±47.9)ng·m^(-3))<秋季((287±172)ng·m^(-3))<春季((294±206)ng·m^(-3))<冬季((420±176)ng·m^(-3)),主要受到气象条件、民用取暖、植被生长等多因素的影响.④分子标志物源解析结果表明,生物质燃烧(BB-OC)、植物碎屑(P-OC)和真菌孢子(F-OC)排放的有机碳(Organic Carbon,OC)浓度分别为(2166±1711)、(11.7±11.8)和(47.5±36.9)ng·m^(-3)(以C计,下同),其对的OC的贡献分别为16.9%、0.09%和0.53%.Atmospheric organic particulate matter is one of the important components of air pollution,but the composition and characteristics of organic molecule tracer of atmospheric PM_(2.5)in typical mountain city in Sichuan Basin are less studied than other popular cities in China.In order to investigate the characteristics of saccharide compounds of PM_(2.5)in urban areas of the Sichuan basin,daily and night samples of PM_(2.5)were collected in Baishiyi,Chongqing from July 2021 to April 2022.The concentrations of 12 saccharides were detected by gas chromatography-mass spectrometry(GC-MS),including anhydrosugars,primary sugars,and sugar alcohols.The results show that:①anhydrosugars were the main component in PM_(2.5),accounting for more than 85%of the total saccharide,with levoglucosan as the main contributor.②The total saccharide concentration was(264±208)ng·m^(-3)),which was lower in the daytime((226±198)ng·m^(-3))than at night((307±212)ng·m^(-3)).③The total saccharide concentration showed seasonal differences as summer((52.5±47.9)ng·m^(-3))<autumn((287±172)ng·m^(-3))<spring((294±206)ng·m^(-3))<winter((420±176)ng·m^(-3)),which might be related to factors such as meteorological conditions,domestic heating and vegetation growth.④The results of apportionment analysis by molecular marker showed that the concentrations of organic carbon(OC)from biomass burning(BB-OC),plant debris(P-OC)and fungal spores(FOC)were(2166±1711)ng·m^(-3)(16.9%in OC),(11.7±11.8)ng·m^(-3)(0.09%in OC),and(47.5±36.9)ng·m^(-3)(0.53%in OC),respectively.

关 键 词：PM_(2.5) 糖类 生物质燃烧 源解析 重庆 

分 类 号：X513[环境科学与工程—环境工程]