Fluorescence Characterization of Dissolved Organic Matter in the East China Sea after Diatom Red Tide Dispersion
ZHUO Peng-ji1, 2, ZHAO Wei-hong1*
1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China
Abstract：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.
Key words：East China Sea;Diatom;Red tide;Fluorescent dissolved organic matter;Excition-emission matrix spectra
禚鹏基1, 2,赵卫红1* . 东海硅藻赤潮后海水溶解有机物的荧光特征[J]. 光谱学与光谱分析, 2009, 29(05): 1349-1353.
ZHUO Peng-ji1, 2, ZHAO Wei-hong1*. Fluorescence Characterization of Dissolved Organic Matter in the East China Sea after Diatom Red Tide Dispersion . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(05): 1349-1353.
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