Fluorescence spectral characteristics and source apportionment of dissolved organic matters in water of Caohai Lake, Guizhou Province
LIN shao-xia1,2, XIAO Zhi-qiang3, ZHANG Zhuan-ling4, PENG Jie5, ZHANG Qing-hai5
1. Guizhou Academy of Testing and Analysis, Guiyang 550000, China; 2. Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Science, Guiyang 550000, China; 3. Qingzhen Branch of Guiyang Ecological Environment Bureau, Qingzhen 551400, China; 4. Guizhou University, Guiyang 550000, China; 5. Guizhou Medical University, Guiyang 550000, China
Abstract:In order to figure out the distribution characteristics and sources of environmental pollutants in Caohai Lake, the 3D excitation-emission matrix fluorescence spectra (3D-EEMs) technique was combined with the parallel factor analysis (PARAFAC) method to analyze the composition characteristics of dissolved organic matters (DOMs) in the water body of Caohai as well as the concentration characteristics and distribution difference of organic matter components in dry season and wet season. Multiple fluorescence indexes were used to explore the sources of DOM sources in the water body. The results showed that the DOMs in the water of Caohai Lake contained four components of two types, namely self-generating humic-like substances C1 (360/450), C2(390/509) and C3(330/400); protein-like substance C4 (280/350) input from terrestrial sources. The four components varied from region to region, and their contents were progressively reduced from center to margin in the dry season with homologous representation; influenced by the inputs from surrounding villages and farmlands in the wet season, they were progressively reduced from the southeast to northwest. According to the analysis results of fluorescent spectral parameters, FI value of DOMs in the water body was greater than 1.4, these DOMs were mainly produced from self-generating endogenous sources, assisted by some terrestrial sources. The relative concentration of organic matters newly generated was high, with low humification degree, and the relative concentration (95%) of humus-like substances was much higher than that (5%) of proteinoid substances. The four organic matter components were correlated with N, P, and heavy metals in the water to different degrees, and the correlations in dry season were especially more significant in comparison with those in the wet season. The study shows that the substances in the water body of Caohai Lake are mainly generated from endogenous sources, along with exogenous inputs, and this also proves that the water environmental management measures taken in Caohai Lake have achieved significant results in recent years. Furthermore, the control of endogenous pollutants should be strengthened in the future pollution prevention scheme.
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