水源水库沉积物及其上覆水DOM光谱特征

为探究水源水库溶解性有机质(DOM)组成结构及来源,以深圳市茜坑水库为例,采用紫外-可见光谱技术(UV-Vis)并结合平行因子分析法三维荧光光谱技术(EEMs-PARAFAC)对水库表层沉积物及其上覆水的DOM光谱特征进行分析.结果表明:PARAFAC识别出3类荧光组分,分别是Cl(Ex/Em=270/304nm,类蛋...

Spectral characteristics of dissolved organic matter in sediment and overlying water of water source reservoir

To explore the composition and source of dissolved organic matter (DOM) in water source reservoir, the Shenzhen Xikeng Reservoir was taken as an example, using ultraviolet-visible spectroscopy (UV-Vis) combined with parallel factor analysis three-dimensional fluorescence spectroscopy (EEMs-PARAFAC) analyzed the DOM spectral characteristics of the surface sediments of the reservoir and its overlying water. The results showed that:PARAFAC had identified three types of fluorescent components, namely C1 (E_x/E_m=270/304nm, protein-like), C2 (E_x/E_m=285,235/360nm, protein-like) and C3 (E_x/E_m=270,340/442nm, humus-like). The fluorescence characteristic index indicated that the sediments of the Xikeng Reservoir and the DOM of the overlying water were affected by both the new endogenous and terrestrial inputs, but mainly endogenous. The protein-like concentration and humus-like concentration in the surface sediments were much higher than the overlying water, and the surface sediments might release small molecules of DOM. The UV-vis spectrum and three-dimensional fluorescence characterization results were consistent, and the DOM molecular weight, degree of humification, aromaticity and hydrophobicity of the surface sediments were all lower than that of the overlying water. Correlation analysis showed that the C1 and C2 components of the overlying water were significantly correlated (P<0.05), and there was homology between them. The study of the DOM spectral characteristics of the sediments of the Xikeng Reservoir and its overlying water can further analyze the characteristics of the organic matter pollution of the reservoir.