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本文探讨三维荧光光谱表征天然湖水中膜污染物质的可行性.选取天然湖水中的4种溶解性有机组分,进行膜过滤试验,探讨水样的荧光峰位置、强度和分布等特征参数与其分子量、亲疏水性质的关系,从而达到用三维荧光光谱参数定性、定量表征膜污染程度的目的.经研究发现,EEM谱图上与膜污染关系最密切的两个区域是:λex=220—250nm/λem=350—380nm和λex=230—280nm/λem=380—500nm,其对应的小分子蛋白类和腐殖类有机物是造成膜污染的主要成分.此外,EEM谱图上的荧光强度还可用来表征过膜前后有机物的截留效率.经研究认为,采用三维荧光光谱反映膜污染成因和膜截留效率,具有实际应用意义.
In this paper, the feasibility of three-dimensional fluorescence spectroscopy for characterization of membrane contaminants in natural lake water was studied.The four soluble organic components in natural lake water were selected for membrane filtration test to investigate the relationship between the characteristic parameters such as fluorescence peak position, intensity and distribution of water samples and their molecular weight , Hydrophilicity and hydrophobicity, so as to achieve the purpose of qualitative and quantitative characterization of membrane fouling by using three-dimensional fluorescence spectral parameters.It has been found that the two regions that are most closely related to membrane fouling in EEM spectra are: λex = 220-250nm / λem = 350-380nm and λex = 230-280nm / λem = 380-500nm, the corresponding small molecule proteins and humic organics are the main components of membrane fouling.In addition, the fluorescence intensity on the EEM spectrum can also be used Characterization of the membrane before and after the retention efficiency of organic matter.The study suggests that the use of three-dimensional fluorescence spectra reflect membrane fouling causes and membrane retention efficiency, has practical significance.