蘑菇湖沉积物间隙水溶解性有机质紫外可见光谱研究  

Study on UV-vis spectra of dissolved organic matter from sediment interstitial water in Moguhu Lake

作　　者：言宗骋 高红杰[1] 郭旭晶 王思宇[1] 于会彬[1] 信欣[2] YAN Zongcheng;GAO Hongjie;GUO Xujing;WANG Siyu;YU Huibin;XIN Xin(Research Center for Comprehensive Control of Watershed Water Pollution,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]中国环境科学研究院流域水环境污染综合治理研究中心,北京100012 [2]成都信息工程大学资源环境学院,四川成都610225

出　　处：《环境工程技术学报》2019年第6期685-691,共7页Journal of Environmental Engineering Technology

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07302-004)

摘　　要：从蘑菇湖选取7个采样点,提取沉积物间隙水DOM样本,运用主成分分析与聚类分析方法对蘑菇湖沉积物间隙水紫外可见光谱进行解析,识别光谱组分与主控因子,并研究DOM的组成、腐殖化程度及空间变化。结果表明,DOM组分为木质素和奎宁、羧酸基团及多烷基腐殖质等,在外围区与深湖区2个区域存在明显差异。从吸收光谱推演出具有良好相关性的S r、SUVA 254、E 2 E 3、E 2 E 4、E 253 E 203、A 2 A 16个光谱指标,可以用于表征DOM的分子量大小和腐殖化水平,外围区DOM的分子量和腐殖化程度皆高于深湖区,并且在区域内呈现随水深增加而递减的趋势。光谱指标聚类分析结果表明,与腐殖化水平呈正相关的指标(E 253 E 203、SUVA 254、A 2 A 1)在表征DOM腐殖化水平时更具有代表性。根据光谱指标聚类结果将7个采样点分为2类,该结果与主成分分析一致。通过DOM腐殖化程度可以在一定程度上判断其空间变化规律。The principal component analysis and cluster analysis were used to analyze the UV-vis spectra of sediment interstitial water in Moguhu Lake,to identify the spectral components and the main control factors,and to study the composition,humification degree and spatial variation of dissolved organic matter(DOM).Seven sampling points were selected from Moguhu Lake to extract DOM samples of sediment interstitial water.The research showed that DOM contained lignin and quinine,carboxylic acid groups,polyalkyl humus and so on.There were significant differences in the two regions of the periphery and deep lake area.Through the analysis of their UV-vis spectra,six spectral indices(S r,SUVA 254,E 2 E 3,E 2 E 4,E 253 E 203,A 2 A 1)with good correlation could be deduced to characterize the molecular weight and humification level of DOM,and the results indicated that the molecular weight and humification of DOM in the peripheral area were all higher than those in the deep lake area,and showed a decreasing trend with increasing water level in the area.The results of variable cluster analysis showed that the index(E 253 E 203,SUVA 254,A 2 A 1),which was positively correlated with humification level,was more representative when characterizing DOM humification.Sample cluster analysis divided the sampling points into two categories,which were consistent with the principal component analysis results.Studies showed that the degree of spatial variability could be judged to some extent by the degree of DOM humification.

关 键 词：紫外可见光谱 溶解性有机质(DOM) 主成分分析 聚类分析 空间变化 

分 类 号：X524[环境科学与工程—环境工程]