南漪湖上覆水溶解性有机质的光谱特征

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Abstract In order to investigate the spectral characteristics and the sources of dissolved organic matter (DOM) in the overlying water of the Nanyi Lake. Herein, ultraviolet-visible (UV-Vis) absorption and three-dimensional fluorescence excitation-emission matrix (EEMs) were utilized to characterize the DOM. Parallel factor analysis (PARAFAC), fluorescence regional integration, correlation analysis, principal component analysis, and cluster analysis were applied to qualitative and quantitative analysis on the DOM. Based on the absorption parameters of a (440), E₂/E₃,E₃/E₄,S_R of UV-Vis spectrum, it was found that DOM has humification and autogenesis characteristics. Moreover, E₂/E₃,E₃/E₄ and a(440) had positively correlation (P<0.01, P<0.05), and there was no significant correlation between S_R and a(440) (P>0.05). The relative molecular weight of DOM increased with increasing the humic acid concentration, but the humic acid concentration cannot be used to determine the sources of dissolved organic matter (DOM). According to the a(440) values, the average concentration of dissolved organic carbon (DOC) in the water was calculated to be 26.79mg/L, and the DOC value in the outlet area of the lake was 10.15mg/L. From the analysis of fluorescence indices (β:α, FI, BIX, HIX, Fn(280), Fn(355)), the DOM exhibited low humification and highly autochthonous characteristics. The spatial distribution of the relative concentration of protein-like components (Fn(280)) was gradually increased from west to east, but the peak values of the relative concentration of humic-like components (Fn(355)) were observed in the estuary and lake outlet. Three fluorescence components of fulvic-like, tryptophan-like and humic-like identified by PARAFAC model were named as C1, C2, C3, and the contribution of C1, C2, C3 to the total fluorescence intensity were 21.96%, 13.36%, 84.21%, respectively. The results of the FRI method showed that the sum of the proportions of protein-like substances (region I +II) was as large as 49.65%, and it was mainly related to anthropogenic activities. Certain correlation was observed between the fluorescence components and the spectral parameters, and it was found that the C1, C3 and β:α, BIX were significantly negative correlated (P<0.001). C3 and β:α, BIX, Fn (355) were positive correlated (P<0.001). Based on the principal components analysis and cluster analysis, the DOM presented different characteristics between the 16sites in the Nanyi Lake. Overall, the DOM was significantly affected by endogenous input, and the control and management of pollutants released from the lake should be strengthened.

Key words： DOM ultraviolet-visible spectrum fluorescence spectroscopy PARAFAC FRI cluster analysis

Received: 15 December 2021

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X524

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	LI Hai-bin
	XIE Fa-zhi
	LI Guo-lian
	ZHAI Hong-xia
	GONG Xue
	LIU Zhan
	LUO Kun
	YUAN Zhi-wei

Cite this article:

LI Hai-bin,XIE Fa-zhi,LI Guo-lian等. Spectral characteristics of dissolved organic matter in the overlying water from Nanyi Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3306-3315.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3306

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