沙颍河水体中CDOM光学特征及其来源解析  

Fluorescence Characteristics and Sources of CDOM in Shaying River

作　　者：李佳璐 左其亭[3,4,5] 冯峰 贾洪涛[1,2] LI Jialu;ZUO Qiting;FENG Feng;JIA Hongtao(Yellow River Conservancy Technical Institute,Kaifeng 475000,China;Henan Engineering Technology Center for Water Resources Conservation and Utilization in the Middle and Lower Reaches of Yellow River,Kaifeng 475004,China;School of Water Conservancy Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhengzhou Key Laboratory of Water Resource and Water Environment,Zhengzhou 450001,China;Henan International Joint Laboratory of Water Cycle Simulation and Environmental Protection,Zhengzhou 450001,China)

机构地区：[1]黄河水利职业技术学院,河南开封475000 [2]河南省黄河中下游水资源节约集约利用工程技术研究中心,河南开封475004 [3]郑州大学水利科学与工程学院,河南郑州450001 [4]郑州市水资源与水环境重点实验室,河南郑州450001 [5]河南省水循环模拟与水环境保护国际联合实验室,河南郑州450001

出　　处：《环境科学与技术》2022年第9期90-97,共8页Environmental Science & Technology

基　　金：国家自然科学基金资助项目(51809110);河南省水利科技攻关计划项目(GG201939)。

摘　　要：利用三维荧光光谱-平行因子分解法对沙颍河上覆水中有色可溶性有机物(CDOM)的组成成分、荧光强度和可能来源进行分析,并探究了CDOM与营养物质之间的相互关系。结果表明,沙颍河上覆水中CDOM主要有3种类别,分别为自生源类腐殖质、陆生源类腐殖质和类色氨酸,类腐殖质所占比例最大。类腐殖质组分自上游至下游呈现先下降再上升的趋势,类蛋白质组分在城区含量最高。CDOM含量受陆生源和自生源的共同影响,具有高腐殖质和弱至中度新近自生源的特征,类腐殖质组分和类蛋白质组分的来源有所不同。由CDOM各荧光组分与营养物质的相关性分析结果可知,陆源性类腐殖质的分解可能会造成水体中磷的二次污染,类蛋白质组分可能会影响氮磷的迁移转化过程。CDOM是溶解性有机碳(DOC)的重要组成部分,能通过CDOM特征反演出DOC的含量。Excitation-emission matrix spectroscopy combined with parallel factor analysis(EEMs-PARAFAC)was applied to investigate the composition,fluorescence intensities and possible sources of chromophoric dissolved organic matter(CDOM)in the overlying water of Shaying River,and the relationship between the fluorescence intensities of each component and the nutrients contents was discussed based on the correlation analysis.The results revealed that there were three fluorescence components in the CDOM of Shaying River,which were autogenic humus-like,terrestrial humus-like,and protein-like components,with the largest proportion of humus-like components.Spatially,the fluorescence intensities of humus-like components showed a trend of decreasing first and the increasing from upstream to downstream,while the protein-like components had the highest intensities in urban sampling site.The intensities of CDOM were affected by both autogenic and terrestrial sources,which were characterized by high humus and weak to moderately recent autologous source according to BIX and HIX.The sources of humus-like components and protein-like components were different.The decomposition of terrestrial humus-like components may cause the secondary pollution of phosphorus in the river.Protein-like components would likely affect the transportation and transformation process of nitrogen and phosphorus.CDOM was an important part of DOC,which can reflect the content of DOC through the fluorescence characteristics of CDOM.

关 键 词：有色可溶性有机物 三维荧光光谱法 平行因子分解法 光学特征 沙颍河 

分 类 号：X522[环境科学与工程—环境工程]