利用UV-vis及EEMs对比冬季完全混合下两个不同特征水库溶解性有机物的光学特性  

Optical Characteristics of Dissolved Organic Matter from Two Different Full Mixed Reservoirs in Winter Based on UV-vis and EEMs

作　　者：黄廷林[1] 方开凯[1] 张春华[1] 周石磊[1] 曾明正[1] 龙圣海 李扬[1] 夏超[1] 从海兵[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]扬州大学环境科学与工程学院,扬州225009

出　　处：《环境科学》2016年第12期4577-4585,共9页Environmental Science

基　　金：国家自然科学基金项目(51478378);国家科技支撑计划项目(2012BAC04B02)

摘　　要：结合紫外吸收光谱(UV-vis)与三维荧光光谱技术(EEMs),并利用平行因子分析的方法,对两个混合型水库(周村水库和金盆水库)水体中DOM的来源及差异性进行了分析.结果显示,两个水库水体均存在3个荧光组分,分别为长波类腐殖质(350/460 nm)、可见类富里酸(335/410 nm)和类蛋白(260,285/360 nm).但是两水库水体的DOM荧光强度及组分构成比例均存在显著差异(P<0.01),两个水库均以类腐殖质为主,但相比金盆水库,周村水库水体中类腐殖质含量相对较低,类蛋白含量较高.周村水库DOM组分间的相关性大于金盆水库,表明后者的DOM来源更为复杂.通过荧光指数FI,自生源指标BIX,腐殖化指标HIX以及新鲜度指数(β∶α)综合对比表明:冬季,在径流量小的情况下,以耕地、畜牧、居民用地为主,沉积物内源污染严重的周村水库水体的DOM以自生源为主;沿岸以森林生态系统为主的金盆水库的DOM则来自混合输入.结果表明混合型水库水文条件及沿岸生态环境特征是决定DOM来源与特征的关键因素之一.The differences in the resource and characteristics of DOM between Zhoucun Reservoir and Jinpen Reservoir were studied by fluorescence ultraviolet-visible（ UV-vis） and excitation-emission matrix spectra combined with parallel analysis（ EEMs-PARAFAC）.The results showed that three fluorescent components were identified by PARAFAC model in Zhoucun Reservoir and Jinpen Reservoir,including long wave humus-like component（ C1： 350 /460 nm）,visible fulvic-like（ C2： 335 /410 nm） and protein-like（ C3： 260,285 /360 nm）. However,the fluorescence intensity and the relative proportions of DOM exhibited significant difference（ P〈0. 01） in two reservoirs. Moreover,the concentration of protein-like component in Zhoucun Reservoir was higher than that in Jinpen Reservoir,while the concentration of humus-like component presented the opposite trend. Based on the comparison of fluorescence index,biological index,humification index and the freshness index,the DOM of Zhoucun Reservoir where the land-use type was cultivated,livestock and residential,the internal pollution of sediments was serious,indicating a strong autochthonous component and aquatic bacterial origin,whereas the DOM of Jinpen Reservoir dominated by forest system had a higher terrigenous contribution in winter. From all the results,hydrological conditions of the reservoir and the characteristics of coastal ecological environment were important factors to influence the DOM sources and characteristics.

关 键 词：溶解性有机物 水库 紫外可见吸收光谱 三维荧光光谱 平行因子分析 

分 类 号：X524[环境科学与工程—环境工程]