为了解降雪中溶解性有机物（ DOM）的特征，采集了北京市不同地区两场降雪，对降雪样品中的DOM进行了紫外?可见光谱、三维荧光光谱、同步荧光光谱表征。结果表明，不同区域降雪中溶解性有机碳（ DOC）浓度变化规律不同，这可能与降雪所在区域的下垫面性质不同有关；降雪样品中DOM的芳香性和分子量较低，含有类色氨酸、类富里酸和类蛋白质类物质，腐殖化程度较低，受生物过程影响较大；同步荧光光谱表明，DOM为类蛋白类物质和芳香性化合物，其中存在苯环和具有共轭系统的多环芳烃，含有少量胡敏酸类物质。研究降雪中DOM光谱性质将有助于进一步研究DOM与共存污染物之间的相互作用，为有效利用降雪提供基础性数据。
To investigate the characteristics of dissolved organic matter ( DOM ) in snow, snow samples collected during two snow eventy at typical sites in different districts of Beijing were characterized by UV?vis spectroscopy, three?dimensional fluorescence spectroscopy and synchronous fluorescence spectroscopy. The results revealed that the concentrations of dissolved organic carbon ( DOC ) at different sites varied widely, which might be attributed to the different nature of underlying surface materials. DOM in snow samples was composed of organic compounds with lower molecular weight and less aromatic structures, which can be possibly attributed to small amount of fulvic acid produced by biological activity. The information obtained from synchronous fluorescence spectra showed that some protein material and aromatic compounds were also found in the DOM. The investigation of spectroscopic properties can facilitate further insight into the interaction between DOM and co?existing pollutants, and also can provide basic information on the efficient utilizations of snow.
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