【摘要】 利用紫外-可见光谱和三维荧光光谱,初步研究乌鲁木齐2018年夏季雨水的溶解性有机质(DOM)光谱特征,并对其来源进行解析。紫外可见光谱分析结果表明,6月降水中的DOM分子量相对较小,7月雨水样品中的腐殖化程度较高,6月、7月雨水样品中DOM的胡敏酸的含量比富里酸含量大,夏季雨水样品DOM中有机物分子缩合程度较高。三维荧光光谱分析结果表明,6月、8月雨水样品腐殖酸荧光峰是雨水荧光的主要贡献者,7月雨水样品类色氨酸荧光峰是雨水荧光的主要贡献者,夏季雨水紫外光区类腐殖质占优,腐殖化组分中稳定组分含量较小,降水样品中的DOM既有陆源输入,也受到微生物活动的影响。更多还原

【Abstract】 UV-Visible spectra and three-dimensional fluorescence spectra are used to analyze structural compositions and sources of dissolved organic matter(DOM) of rainfall in the Summer of 2018 from Urumqi. Uv-visible spectrum analysis shows that DOM with lower molecular weight in the rainwater of June, while the rainwater of July is of high humification degree in terms of the compositions of DOM, the content of humic acid is higher than fulvic acid in the samples of June and July. The molecular condensation degree of organics in DOM in summer is high. Three-dimensional fluorescence spectra analysis showed that the humic acid fluorescence peak in June and August was the main contributer of rainwater fluorescence, and the tryptophan fluorescence peak was the main contributer of rainwater fluorescence in July. The humus in the uv-light area of rainwater was dominant, and the stable component content in humus component was smaller. The DOM of rainwater was influenced by microbial activity and terrestrial inputs.更多还原