武汉市不同类型天然水体中溶解性有机质的三维荧光光谱特征  

Characterization and Analysis of Dissolved Organic Matter in Different Types of Natural Water in Wuhan by Three-Dimensional Fluorescence Spectra

作　　者：白璐 徐雄[1] 刘权震 杜艳君 王东红[1,2] BAI Lu;XU Xiong;LIU Quan-zhen;DU Yan-jun;WANG Dong-hong(Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Acade-my of Sciences Beijing 100085 China;University of Chinese Academy of Sciences,Beijing 100049,China;National Institute of Environment Health,China CDC,Beijing 100021,China)

机构地区：[1]中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085 [2]中国科学院大学,北京100049 [3]中国疾病预防控制中心环境与健康相关产品安全所,北京100021

出　　处：《光谱学与光谱分析》2022年第5期1642-1647,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金面上项目(42077157)资助。

摘　　要：基于三维荧光光谱(3D-EEM)技术,结合荧光区域积分法(FRI)和荧光特征参数,研究了武汉市4种不同类型(河流、湖泊、水源水、雨水)的天然水体中溶解性有机质(DOM)的三维荧光光谱特征,并和近十年武汉东湖相关的研究数据进行了比对。结果表明,5种荧光组分均有检出,分别为类酪氨酸荧光组分(C1)、类色氨酸荧光组分(C2)、类富里酸荧光组分(C3)、溶解性的微生物代谢物类荧光组分(C4)和类腐殖酸荧光组分(C5)。从荧光特征上来看,水质较差、存在轻中度富营养化、受污染较重的湖泊类水样中C1、C2和C3组分的荧光强度最高,相对较清洁的水源水、雨水与作为对照的自来水中DOM的荧光组分相似,仅C5组分存在差异;从DOM的来源上看,武汉市内不同类型天然水体中DOM具有显著的陆源(陆生植物和土壤有机质等)为主、内源(微生物、藻类等)为辅的混合输入特征;河流、湖泊、雨水和水源水中DOM的陆源组分占比均值分别为46.2%,56.4%,54.2%和51.6%,内源组分占比均值分别为12.3%,10.1%,10.4%和9.7%。相关性分析表明,C1,C2和C3组分之间具有显著的相关性(R^(2)>0.98),主要来自陆地来源,具有同源性;C4、C5组分分别和总磷(TP)、总有机碳(TOC)之间具有较强的正相关性(R^(2)>0.73)。与历史数据进行对比分析发现,近10年武汉东湖湖水中DOM的陆源组分(类酪氨酸、类色氨酸、类富里酸)呈逐步上升的趋势,但是在2020年东湖湖水DOM组分的陆源组分骤降,类腐殖酸和微生物代谢组分明显上升。Based on three-dimensional excitation-emission matrix spectroscopy(3 D-EEMs),combined with regional fluorescence integration(FRI)and characteristic fluorescence parameters,the spectral characteristics of dissolved organic matter(DOM)in four different types of natural water in Wuhan were studied.Meanwhile,the results of East Lake in Wuhan were compared with relevant data in the recent ten years.The results showed that five fluorescence components were detected,including protein-like fluorescence component(tyrosine-like(C1),tryptophan-like(C2)),fulvic acid-like fluorescent component(C3),soluble microbial metabolite component(C4)and humic acid-like component(C5).From the perspective of fluorescence characteristics,the fluorescence intensity of components C1,C2 and C3 are the highest in the sampling water of lakes with relatively poor water quality,mild to moderate eutrophication and severe pollution.The fluorescence components of DOM in the relatively clean source water,rainwater and the tap water(as the control)were similar.Only C5 components were different;In terms of the source of the DOM,the DOM of water in Wuhan has a significant mixed input feature,with the main terrestrial source and the supplementary endogenous source.The mean terrigenous components of the river,lake,rainwater,source water are 46.2%,56.4%,54.2%and 51.6%,respectively,and the mean proportions of endogenous source components are 12.3%,10.1%,10.4%and 9.7%,respectively.The correlation analysis showed that there was a strong correlation between C1,C2 and C3 components(R^(2)>0.98),mainly from terrestrial sources,with homology;C4 and C5 components also have a strong positive correlation(R^(2)>0.73)with total phosphorus(TP)and total organic carbon(TOC),respectively.Compared to the past 10 years data,the terrestrial components(C1,C2,C3)of DOM in Wuhan East Lake have gradually increased,but decreased sharply in 2020,while C4 and C5 components increased significantly.

关 键 词：三维荧光 天然水体 溶解性有机质 武汉 

分 类 号：X52[环境科学与工程—环境工程]