重污染期间大气类腐殖质来源与光学特性研究  

Research on the sources and optical properties of atmospheric humic-like substances during heavy pollution periods

作　　者：刘佳文 王启元[2] 张倩 王锦 李常艳 孙力 LIU Jia-wen;WANG Qi-yuan;ZHANG Qian;WANG Jin;LI Chang-yan;SUN Li(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China;Jiangsu Province Key Laboratory of Environmental Engineering,Jiangsu Province Environmental Science Research Institute,Nanjing 210036,China;Jiangsu Province High-Tech Key Laboratory for Atmospheric Environmental Monitoring and Pollution Control,Jiangsu Province Collaborative Center for Atmospheric Environment and Equipment Technology,School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]中国科学院地球环境研究所,陕西西安710061 [3]江苏省环境科学研究院,江苏省环境工程重点实验室,江苏南京210036 [4]南京信息工程大学环境科学与工程学院,江苏省大气环境监测与污染控制高技术重点实验室/江苏省大气环境与装备技术协同中心,江苏南京210044

出　　处：《中国环境科学》2025年第4期1789-1798,共10页China Environmental Science

基　　金：国家重点研发计划项目(2022YFF0802501);陕西省重点研发计划项目(2022ZDLSF06-07)。

摘　　要：联合固相萃取法和热光法分别获取西安市重污染事件期间高时间分辨率PM_(2.5)中不同极性的HULIS及其HULIS的碳含量(HULIS-C),并使用配备液体波导毛细管流通池(LWCC)的紫外-可见分光光度计分析HULIS的吸光特性,同时结合正定矩阵因子分解模型(PMF)解析对HULIS进行来源解析.结果表明,中性HULIS(HULIS-n)的平均质量浓度(6.6±2.6)μg/m^(3),高于酸性HULIS(HULIS-a)(3.7±3.5)μg/m^(3),分别约占OC的30%、18%,说明重污染期间HULIS的污染比较严重.HULIS-n的吸光系数(AAE、E_(2)/E_(3)和MAE_(365))均分别大于HULIS-a,表明HULIS-n比HULIS-a包含更多的共轭、芳香族结构且具有更强的吸光性,对大气能见度的影响也更为显著.污染源分析显示,HULIS-n和HULIS-a的源贡献存在明显差异.HULIS-n主要来源包括二次源、燃煤源、机动车源等,而HULIS-a的二次源和燃煤源贡献较高,机动车源和生物质燃烧源贡献为零,工业源贡献显著高于HULIS-n.The solid-phase extraction method and the thermal-optical method were combined to obtain different polar HULIS and the carbon content of HULIS(HULIS-C)in PM_(2.5) with high temporal resolution during the heavy pollution event in Xi'an.The light absorption characteristics of HULIS were analyzed using a UV-Vis spectrophotometer equipped with a liquid waveguide capillary cell(LWCC),and the positive matrix factorization model(PMF)was used to analyze the sources of HULIS.At the same time,the source of HULIS is combined with the positive matrix factorization model(PMF).The results showed that the average mass concentration of neutral HULIS(HULIS-n)(6.6±2.6)μg/m^(3) was higher than that of acidic HULIS(HULIS-a)(3.7±3.5)μg/m^(3),accounting for approximately 30%and 18%of OC,respectively,indicating severe HULIS pollution during heavy pollution periods.The absorption coefficients(AAE,E_(2)/E_(3),and MAE_(365))of HULIS-n were all greater than those of HULIS-a,suggesting that HULIS-n contains more conjugated and aromatic structures and has stronger light-absorbing properties,with a more significant impact on atmospheric visibility.The source analysis revealed clear differences in the contributions of HULIS-n and HULIS-a.The primary sources of HULIS-n included secondary sources,coal combustion,motor vehicle emissions.,while the contributions of secondary sources and coal combustion were higher for HULIS-a.

关 键 词：类腐殖质 雾霾 来源解析 污染成因 

分 类 号：X513[环境科学与工程—环境工程]