摘要
利用激发-发射矩阵光谱法(EEMs),测定了2007年4月下旬东海硅藻赤潮消亡后海水溶解有机物的三维荧光,并对荧光特征及其强度与盐度、叶绿素a和碳水化合物的关系进行了分析和讨论。结果显示东海硅藻赤潮后海水中有较强的类蛋白荧光,主要荧光峰有Exmax/Emmax为270～280/290～315nm(B峰)和220～230/290～305nm(D峰)的类酪氨酸荧光峰,230～240/335～350nm(S峰)和280/320nm(T峰)的类色氨酸荧光峰,其中B峰强度最大,个别站点荧光强度高达3955。赤潮消亡主要海区的FIB/FIS较大,表明类蛋白溶解有机物主要是由赤潮藻破碎分解产生的类酪氨酸。在255～270/435～480nm(A峰)和330～350/420～480nm(C峰)还观察到两种类腐殖质荧光峰,它们的强度低于类蛋白荧光。S峰、A峰和C峰三者之间互相呈较好的正相关,且三者荧光强度与盐度都有显著的线性负相关,其分布均呈现出近岸高远岸低的特点,表明江浙沿岸水的输入是其共同的重要来源。各类荧光峰的强度与叶绿素a的相关性不显著,现存的浮游植物不是赤潮消亡水体中荧光溶解有机物的主要直接来源。
Fluorescence excitation-emission spectroscopy （EEMS） was employed to analyze the 3-dimensional fluorescence of dissolved organic matter in the East China Sea after diatom red tide dispersion. The relationships between fluorescence peak intensity, and salinity and chlorophyll-a were discussed. The centers of protein-like fluorescence peaks dispersed at Exmax/Emmax =270- 280/290-315 nm （Peak B）, 220-230/290-305 nm （Peak D）, 230-240/335-350 nm（Peak S）and 280/320 nm（Peak T）. Two humic-like peaks appeared at 255-270/435-480 nm （Peak A）and 330-350/420-480 nm（Peak C）. High tyrosine-like intensity was observed in diatom red tide dispersion area, and tryptophan-like fluorescence was also found which was lower. High FIB/FIS showed that diatom red tide produced much tyrosine like matter during dispersion. Peaks S, A and C had positive correlation with one another, and their distributions were similar, which decreased with distance increasing away from the shore. Good negative correlations between peaks S, A and C and salinity suggested that Jiangsu-Zhejiang coastal water was the same source of them. Correlations between fluorescence peak intensity and chlorophyll-a were not remarkable enough to clear the relationship between fluorescence and living algal matter. It was supposed that the living algal matter contributed little to the fluorescence intensity of algal dispersion seawater.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第5期1349-1353,共5页
Spectroscopy and Spectral Analysis
基金
国家高技术研究发展计划(“863”计划)项目(2006AA09Z180)
中国科学院知识创新重要方向项目(KZCX2-YW-208-01)资助
关键词
东海
硅藻
赤潮
荧光溶解有机物
激发-发射矩阵光谱
East China Sea
Diatom
Red tide
Fluorescent dissolved organic matter
Excition-emission matrix spectra
