Spectral characteristics of dissolved organic matter(DOM) in Xiaoyi River during dry and wet periods

doi:10.3969/j.issn.1000-1565.2023.03.008

Abstract

Abstract: Using UV-vis spectroscopy, excitation-emission matrix spectroscopy and parallel factor analysis, the temporal and spatial variation of dissolved organic matter(DOM)spectral characteristics and fluorescence components in Xiaoyi River were studied, and the relationship between DOM and water quality parameters was analyzed. The results showed that the concentration, aromatics, molecular weight and photochemical activity of chromophoric dissolved organic matter(CDOM)in dry season were significantly higher than those in wet season(P<0.01), and the humification degree in wet season was higher than that in dry season. Three humus components(C1, C2 and C3)and one protein component(C4)were detected in the model. Humus and protein-like components came from point sources in dry season, and protein components came from point sources in wet season. Humus components were affected by point sources and plane sources together. The correlation and regression analysis of fluorescent dissolved- DOI:10.3969/j.issn.1000-1565.2023.03.008孝义河枯、丰水期溶解有机物(DOM)的光谱特征岳龙飞^1,2,李洪波^1,3(1.河北大学生态环境学院,河北保定 071002;2.河北省生态环境科学研究院,河北石家庄 050037;3.河北省水环境科学实验室,河北石家庄 050037;)摘要:采用紫外-可见光谱和激发-发射矩阵光谱与平行因子分析相结合的方法,研究了孝义河溶解有机物(DOM)光谱特征和荧光成分的时空变化,分析了DOM与水质参数的关系.结果表明:枯水期发色团溶解有机物(CDOM)浓度、芳香性、分子相对质量和光化学反应活性显著高于丰水期(P<0.01),丰水期的腐殖化程度高于枯水期;模型共检出3种类腐殖质组分(C1,C2和C3)和1种类蛋白组分(C4),枯水期腐殖质成分和类蛋白成分来源于流域点源排放,丰水期蛋白质成分来源于点源,腐殖质成分受点源和面源共同影响;荧光溶解有机物(FDOM)组分与水质参数的相关性和回归分析表明其对关键水质指标(化学需氧量,COD)具有良好的预测能力.因此,DOM的紫外光谱参数和荧光组分可用于快速水质监测和污染源指示.关键词:孝义河;溶解性有机物;紫外-可见光谱;激发-发射矩阵光谱;平行因子分析中图分类号:X522 文献标志码:A 文章编号:1000-1565(2023)03-0281-11Spectral characteristics of dissolved organic matter(DOM)in Xiaoyi River during dry and wet periodsYUE Longfei^1,2, LI Hongbo^1,3(1. College of Eco-Environment, Hebei University, Baoding 071002, China; 2.Hebei Academy of Ecological and Environmental Sciences, Shijiazhuang 050037, China; 3. Hebei Provincial Laboratory of Water Environment Science, Shijiazhuang 050037, China)Abstract: Using UV-vis spectroscopy, excitation-emission matrix spectroscopy and parallel factor analysis, the temporal and spatial variation of dissolved organic matter(DOM)spectral characteristics and fluorescence components in Xiaoyi River were studied, and the relationship between DOM and water quality parameters was analyzed. The results showed that the concentration, aromatics, molecular weight and photochemical activity of chromophoric dissolved organic matter(CDOM)in dry season were significantly higher than those in wet season(P<0.01), and the humification degree in wet season was higher than that in dry season. Three humus components(C1, C2 and C3)and one protein component(C4)were detected in the model. Humus and protein-like components came from point sources in dry season, and protein components came from point sources in wet season. Humus components were affected by point sources and plane sources together. The correlation and regression analysis of fluorescent dissolved- 收稿日期:2022-06-15 基金项目:河北省科技厅重点研发项目(3110701) 第一作者:岳龙飞(1996—),男,山西朔州人,河北大学在读硕士研究生,主要从事污染物溯源研究.E-mail:15951003982@163.com 通信作者:李洪波(1969—),男,河北肃宁人,河北省生态环境科学研究院正高级工程师,主要从事水生态治理与修复方向研究.E-mail:lhbhky@163.com第3期岳龙飞等:孝义河枯、丰水期溶解有机物(DOM)的光谱特征organic matter(FDOM)components and water quality parameters show that DOM has a good ability to predict the key water quality index chemical oxygen demand(COD). Therefore, the UV spectrum parameters and fluorescence components of DOM can be used for rapid water quality monitoring and pollution source indication.

Key words: Xiaoyi River, dissolved organic matter, UV-visible spectrum, excitation emission matrix spectroscopy, parallel factor analysis

CLC Number:

X522

YUE Longfei, LI Hongbo. Spectral characteristics of dissolved organic matter(DOM) in Xiaoyi River during dry and wet periods[J]. Journal of Hebei University(Natural Science Edition), 2023, 43(3): 281-291.

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