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首页> 外文期刊>International Journal of Environmental Research and Public Health >The Evaluation for Alterations of DOM Components from Upstream to Downstream Flow of Rivers in Toyama (Japan) Using Three-Dimensional Excitation-Emission Matrix Fluorescence Spectroscopy
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The Evaluation for Alterations of DOM Components from Upstream to Downstream Flow of Rivers in Toyama (Japan) Using Three-Dimensional Excitation-Emission Matrix Fluorescence Spectroscopy

机译：三维激发-发射矩阵荧光光谱法评估富山（日本）河流上游和下游DOM组成的变化

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The dissolved organic matter (DOM) is one of the important factors for controlling water quality. The behavior and constitutions of DOM is related to the risk of human health because it is able to directly or indirectly affect the behavior, speciation and toxicity of various environmental pollutants. However, it is not easy to know the contents of DOM components without using various complicated and time consuming analytical methods because DOM is a complex mixture and usually exists at low concentration. Here, we describe the fluorescence properties of DOM components in water samples collected from four rivers in Toyama, Japan by means of the three-dimensional excitation-emission matrix (3DEEM) fluorescence spectroscopy. In order to evaluate the alterations of DOM components in each of the river during the flow from upstream to downstream, the patterns of relative fluorescence intensity (RFI) at six peaks which are originated from fluorophores including humic-like and protein-like components were investigated. The changes in the patterns of RFI values at each of the peak and the concentration of dissolved organic carbon (DOC) for each river water sample were discussed in connection with the differences of land use managements and basic water quality parameters, such as pH, EC, turbidity, Fe3+, T-N, NO3-N, T-P, PO4-P, chlorophyll a, DOC and N/P ratio. The DOC concentrations in the water samples collected from these rivers were relatively low (0.63–1.16 mg/L). Two main peaks which have a strong RFI value expressed a positive correlation with the DOC concentration (r = 0.557, 0.535). However, the correlations between the RFI values for other four peaks and the DOC concentration were below 0.287. The alterations of DOM components during the flow of a river from upstream to downstream were investigated from the changes in the patterns of RFI values for six fluorescent peaks. It was clarified that the great increase of RFI values in peak A and peak T from river water located in urban area showed high concentration of PO4-P and Fe3+, and low N/P ratio due to the high biological activities. The values of fluorescence index (FIX) and biological index (BIX) were as high as 1.60 and 0.72, respectively.
机译：溶解有机物（DOM）是控制水质的重要因素之一。 DOM的行为和构成与人类健康风险有关，因为它能够直接或间接影响各种环境污染物的行为，物种和毒性。但是，如果不使用各种复杂且费时的分析方法，就不容易知道DOM的成分，因为DOM是一种复杂的混合物，通常以低浓度存在。在这里，我们通过三维激发发射矩阵（3DEEM）荧光光谱法描述了从日本富山的四条河流收集的水样中DOM成分的荧光特性。为了评估从上游到下游流动过程中每条河流中DOM成分的变化，研究了六个峰的相对荧光强度（RFI）的模式，这些峰来自包括类腐殖质和蛋白状组分的荧光团。 。结合土地利用管理和pH，EC等基本水质参数的差异，讨论了每个峰值的RFI值模式的变化以及每个河流水样中溶解有机碳（DOC）的浓度变化。 ，浊度，Fe3 +，TN，NO3-N，TP，PO4-P，叶绿素a，DOC和N / P比。从这些河流收集的水样中的DOC浓度相对较低（0.63-1.16 mg / L）。两个具有较高RFI值的主峰与DOC浓度呈正相关（r = 0.557，0.535）。但是，其他四个峰的RFI值与DOC浓度之间的相关性低于0.287。从六个荧光峰的RFI值的模式变化研究了河流从上游到下游流动过程中DOM成分的变化。可以看出，城市地区河水的A峰和T峰的RFI值大大增加，这是由于高生物活性导致PO4-P和Fe3 +浓度高，N / P比低。荧光指数（FIX）和生物指数（BIX）分别高达1.60和0.72。

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