白洋淀沉积物中溶解有机质荧光特性及其与铜的相互作用  

Fluorescence Characteristics of Dissolved Organic Matter and Interaction Between Cu(Ⅱ) and DOM in Sediments of Baiyangdian Lake,China

作　　者：赵萱[1] 成杰民[1] 

机构地区：[1]山东师范大学人口.资源与环境学院,济南250014

出　　处：《农业环境科学学报》2012年第6期1217-1222,共6页Journal of Agro-Environment Science

基　　金：国家重点基础研究发展计划(973)项目"湖泊水环境质量演变与水环境基准研究"(2008CB418200)

摘　　要：在实验条件下通过三维荧光光谱、荧光猝灭滴定和质子核磁共振(1HNMR),分析了白洋淀污染水体沉积物中溶解有机质(DOM)与Cu(Ⅱ)的相互作用。结果表明:DOM的结构以碳水化合物及多糖为主且具有明显的类蛋白(峰B)和类富里酸(峰A和峰C)荧光峰,类蛋白的荧光强度较强于可见类富里酸;3类荧光基团荧光强度由于Cu(Ⅱ)猝灭,呈明显不同程度的降低;并且DOM与Cu(Ⅱ)络合常数及1HNMR分析表明DOM中荧光基因与Cu(Ⅱ)络合或螯合能力较大,配位的配位基较多。Fluorescence spectrum technique has advantages of high sensitivity, and quick-and-easy detection and has widely applied to characterize the dissolved organic matter（ DOM ）. For better understanding the fluorescence characteristics of DOM in Baiyangdian Lake of China, fluorescence emission spectroscopy and three-dimensional excitation emission matrix fluorescence spectroscopy（ 3DEEM ） were used. Fluorescence quenching titration and ^1HNMR were used to investigate the interaction between Cu（ Ⅱ ） and DOM. The ^1HNMR results showed that DOM in Baiyangdian Lake was mainly composed of large amount of carbohydrate. In fluorescence spectra obtained in this study, two ful- vie acid-like fluorescence peaks（peak A and peak C ） and protein-like（peak B ） were observed. Compared with visible fulvic-like, proteinlike fluorescence intensity was high. The intensity for individual peak A, B and C decreases as concentrations of Cu（ Ⅱ ） increase. DOM-Cu（ Ⅱ ） complexation constants and IHNMR suggested that the fluorescent groups interact more strongly with Cu（ Ⅱ ）.

关 键 词：沉积物 溶解有机质 三维荧光光谱 核磁共振 

分 类 号：X524[环境科学与工程—环境工程]