炼油污染场地地下水DOM三维荧光指纹特征及指示意义  

Fluorescence Excitation-Emission Matrix Characteristics and Implication of Dissolved Organic Matter in Groundwater at a Typical Refinery-Polluted Site

作　　者：李小倩[1,2,3] 刘鋆 何宁洁 宋晓东 邢新丽 刘运德[1,2,3] Li Xiaoqian;Liu Yun;He Ningjie;Song Xiaodong;Xing Xinli;Liu Yunde(School of Environmental Studies,China University of Geosciences,Wuhan 430078,China;State Key Laboratory of Water Pollution Traceability and Control for Environmental Protection,Wuhan 430078,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430078,China;Institute of Geological Survey,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学环境学院,湖北武汉430078 [2]国家环境保护水污染溯源与管控重点实验室,湖北武汉430078 [3]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430078 [4]中国地质大学地质调查研究院,湖北武汉430074

出　　处：《地球科学》2024年第6期2199-2212,共14页Earth Science

基　　金：国家重点研发计划项目(No.2020YFC1807101)。

摘　　要：综合应用荧光峰识别、三维荧光光谱(excitation-emission matrix,EEMs)区域积分法、聚类分析和相关性分析等方法,探究污黄土高原某炼油厂污染场地地下水溶解性有机物(dissolved organic matter,DOM)三维荧光光谱特征及其对有机污染的指示作用.结果显示,污染场地地下水DOM的EEMs表现出显著的石油类污染物的指纹特征.EEMs中表征苯和石油烃的区域Ⅰ和区域Ⅱ的荧光区域积分标准体积占总区域积分标准体积的55%~88%,与地下水样品有机污染组分的测试结果吻合.基于三维荧光指纹特征相似性的聚类分析揭示了污染场地地下水有机污染类型与空间异质性分布特征.污染地下水EEMs区域积分标准体积与有机组分、光谱参数、水化学组成的相关性分析,表明DOM的三维荧光指纹谱能够有效指示场地地下水的有机污染程度、组成特征和水化学的响应,为地下水污染监测和预警的有效提供示踪工具.The excitation-emission matrix(EEMs)fluorescence spectroscopy of dissolved organic matter(DOM)has been widely used in monitoring and warning of water pollution.To clarify the indicator of EEMs fluorescence fingerprint on groundwater organic pollution at refinery sites,the EEMs characteristics of DOM and spatial distribution of organic pollution in groundwater was studied at a typical refinery-polluted site by EEMs regional integration,correlation analysis and hierarchical clustering.The EEMs results show that DOM in groundwater of the polluted site had significant fluorescence spectral fingerprint as oil contaminants.The constituents of DOM in the polluted groundwater were quantified by EMMs regional integration based on fluorescence of model compounds.The normalized volumetric integration of regionsⅠandⅡrepresenting benzene series and petroleum hydrocarbons accounts for 55%-88%of the total volumetric integration of all regions,which is consistent with GCMS results of organic compositions.The hierarchical clustering on the similarity of EEMs can effectively distinguish the types of groundwater organic pollution and their spatial distribution in the polluted site.The correlation analyses between normalized volumetric integration of EEMs regions and organic components,spectra parameters and water chemistry further suggest that the fluorescence EEMs fingerprint of DOM can effectively reveal organic pollution and effect on geochemistry of groundwater at the refinery site,indicating as an effective tracer to monitor and warn groundwater organic pollution.

关 键 词：溶解性有机物 荧光光谱指纹 荧光光谱区域积分 地下水有机污染 炼油场地 水文地质 

分 类 号：P592[天文地球—地球化学]