三维荧光光谱法分析巢湖CDOM的空间分布及其来源

Analysis of CDOM spatial distributions variations in Chaohu Lake and its sources by three dimensional fluorescence excitation-emission matrix

利用三维荧光光谱法研究了巢湖有色溶解有机物(CDOM)及其相关组分的空间分布特征,并对CDOM来源进行了分析.结果表明,巢湖西半湖CDOM平均相对荧光强度为927.1,显著高于东半湖的平均相对荧光强度544.9;CDOM组分腐殖酸(HA)和类蛋白物质浓度空间变化特征类似于CDOM;南淝河和丰乐河是西半湖CDOM的重要污染源;巢湖西北区域和中部湖区CDOM分别主要来源于南淝河和白石山河排放源.三维荧光光谱法在大型湖泊和河流水质监测中具有潜在的应用前景.

Variations of CDOM concentrations and its sources in Chaohu Lake were investigated by three dimensional fluorescence excitation-emission matrix（3DEEM）. Results indicated that the average relative fluorescence intensity of CDOM in western＇Chaohu Lake was 927.1, significantly larger than that of eastern Chaohu which was only 544.9, Spatial variations of humic acid and protein-like concentrations were similar to the variations of CDOM, Nanfei river and fengle river were the main sources of CDOM in western Chaohu Lake. Further research illustrated that the sources of CDOM in westnorthern Chaohu and in middle Chaohu were the outlets of Nanfei river and baishishan river, respectively. In the conclusion of this paper, three potential applications of 3DEEM for monitoring of water quality were presented.