Composition analysis of colored dissolved organic matter in Taihu Lake based
on three dimension excitation-emission fluorescence matrix and PARAFAC
model, and the potential application in water quality monitoring |
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Authors: | WANG Zhi-gang LIU Wen-qing ZHAO Nan-jing LI Hong-bin ZHANG Yu-jun SI-MA Wei-cang and LIU Jian-guo |
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Institution: | 1. School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract: | Taihu Lake is one of the five biggest lakes in China. Surface water samples from 26 sampling sites of Taihu Lake were collected. Furthermore wet chemical analysis (CODCr and BOD5) and measurement of three dimensional excitation-emission matrix (3DEEM) spectra in the laboratory have been conducted. Using parallel factor analysis (PARAFAC) model, three components of colored dissolved organic matter (CDOM) have been identified successfully, based on the analysis of 3DEEM data. The characteristics of the three components also have been described by comparing them to some components of CDOM, identified in earlier researches. Meanwhile, spatial variations of concentration for the three components in Taihu Lake have been analyzed, and the result indicates that the concentration of component 1 depends more on the situation of wastewater pollution and can be used as the indicator of wastewater pollution. The relationship between the concentrations of the three components and results of the wet chemical analysis show that none of the three components can be used as indicators of gross organic matter in water. However, the concentrations of all the three components have obvious linear relationships with the BOD5 value, especially for component 1 (r2 = 0.72878). Finally, the potential applications of the composition analysis based on 3DEEM and PARAFAC model in water quality monitoring have been illuminated. |
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Keywords: | 3DEEM Taihu Lake monitoring of water quality CDOM PARAFAC model PARAFAC matrix fluorescence dimension based Taihu Lake dissolved organic matter colored composition analysis Composition monitoring water quality potential applications especially linear relationships value However |
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