FENGXuan-cheng,WANGChen-ao,XUShi-hao,et al.Source Analysis of Dissolved Organic Matter in Small and Medium-sized Watersheds Based on 3D-EEMs-PARAFAC[J].China Water & Wastewater,2025,41(23):84-90.
中小流域DOM来源的3D-EEMs-PARAFAC解析
- Title:
- Source Analysis of Dissolved Organic Matter in Small and Medium-sized Watersheds Based on 3D-EEMs-PARAFAC
- Keywords:
- small and medium-sized watersheds; dissolved organic matter; three-dimensional excitation-emission matrix fluorescence; parallel factor analysis; fluorescence peak
- 摘要:
- 溶解性有机物（DOM）是较好的污染物溯源指标，可为流域水环境治理措施制定提供理论依据。为揭示中小流域水体的DOM特征及来源，采集源头型、近郊型、城镇型三类河流水体的38个样品，采用三维荧光光谱参数（FI、BIX、HIX、β∶α）、三维荧光光谱-平行因子（3D-EEMs-PARAFAC）模型对DOM荧光特征进行分析。结果表明，FI、BIX、HIX、β∶α的范围分别为1.29~3.51、0.75~2.34、0.03~0.56、0.72~2.08，DOM主要为自生源，生物源组分占比较高，腐殖化程度较低，微生物活性较高。PARAFAC解析出5种组分：类色氨酸（C1）、芳香蛋白和可溶性微生物代谢产物（C2和C4）、胡敏酸（C3）、类酪氨酸（C5），其中C1、C2、C4、C5占总荧光强度的89.96%。源头型河流的DOM主要组分为芳香蛋白和可溶性微生物代谢产物（占比约54.03%）；近郊型河流的DOM主要组分为类色氨酸、类酪氨酸（占比约70.78%）；城镇型河流的DOM主要组分为芳香蛋白、可溶性微生物代谢产物、类酪氨酸（占比约79.78%）。根据DOM组分来源，可制定针对性的流域水环境治理措施。
- Abstract:
- Dissolved organic matter (DOM) serves as an effective indicator for pollutants source tracing, providing a theoretical basis for selecting water environment management measures in river basins. To investigate the characteristics and sources of DOM in small and medium-sized watersheds, thirty-eight tap water samples were collected from three types of rivers (headwater, peri-urban, and urban-type rivers). The fluorescence properties of DOM were analyzed using three-dimensional fluorescence spectroscopy parameters (FI, BIX, HIX, β∶α) and three-dimensional excitation-emission matrix fluorescence spectroscopy coupled with parallel factor analysis model (3D-EEMs-PARAFAC). The results showed that the ranges of FI, BIX, HIX, and β:α were 1.29-3.51, 0.75-2.34, 0.03-0.56, and 0.72-2.08, respectively. DOM was primarily autochthonous (originating within the aquatic system), dominated by biogenic components, with low humification and high microbial activity. PARAFAC analysis identified five components, including tryptophan?like substance (C1), aromatic proteins and soluble microbial byproduct (C2 and C4), humic acid-like substance (C3), tyrosine-like substance (C5). Components C1, C2, C4, and C5 collectively accounted for 89.96% of the total fluorescence intensity. The main components of DOM in the headwater rivers were aromatic proteins and soluble microbial byproduct, accounting for approximately 54.03%.The DOM components in peri-urban rivers was characterized by tryptophan-like and tyrosine-like substance (approximately 70.78%). The DOM components in urban-type rivers were primarily composed of aromatic proteins, soluble microbial byproduct, and tyrosine?like substances (approximately 79.78%). Based on the source analysis of DOM components, targeted water environment management strategies can be proposed.
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