三维荧光光谱表征嘉陵江北碚城区段水中溶解有机质

Characterization of Dissolved Organic Matter in the Jialing River Water with 3D Fluorescence Spectrometry

利用三维荧光光谱研究了嘉陵江北碚城段水中的溶解有机质．结果表明，水样三维荧光光谱图中有3个荧光峰A，B和D，其中A为类腐殖酸荧光峰，B和D为类蛋白荧光峰．荧光峰A较强，说明嘉陵江中溶解有机质（DOM）主要以陆源类腐殖酸为主．水样中溶解有机碳（DOC）的含量与254nm处的吸光度值之间具有良好的线性关系，样品荧光强度与DOC之间也具有良好的相关性．荧光峰D与荧光峰B的比值r（D，B）在0．79～1．86之间，说明水体受有机物污染较轻．

The dissolved organic matter （DOM） in the water of the Jialing River at Beibei was studied with 3D fluorescence spectrometry. Three fluorescent peaks were detected in all the water samples, of which the A-type fluorescent peak was humic-like and the B-type and D-type peaks were protein-like. Fluorescent intensity of peak A -was higher than that of peak-B and peak-D, indicating that the DOM of the Jialing River is composed mainly of land-derived humic acid. The concentration of DOC （dissolved organic carbon） in the water samples was linearly correlated with A254 and the fluorescence intensity of DOM. The ratio of peak D to peak-B [r（D,B）] ranged from 0.79 to 1.86, showing that the waters studied were only slightly contaminated by organic pollutants.