乌鲁木齐市2018年夏季降雨中溶解性有机质的光谱特征及来源解析
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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。
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.
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.
引文
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[20] McKnight D M, Boyer E W, Westerhoff P K, et al. Spectrofluorometric characterization of dissolved organic matter for indication of precursor organic material and aromaticity[J]. Limnology and Oceanography, 2001,46(1):38-48.
[21] 肖隆庚, 陈文松, 陈国丰, 等. 中国南海CDOM三维荧光光谱特征研究[J]. 环境科学学报, 2014,34(1):160-167.
[2] 梁俭,江韬,魏世强,等.夏、冬季降雨中溶解性有机质(DOM)光谱特征及来源辨析[J].环境科学,2015,36(3):888-897.
[3] 吴秀萍,宋海燕,谭军,等.雨水中溶解有机质的光谱学研究[J].华南师范大学学报(自然科学版),2015,47(4):74-79.
[4] Zhao C, Wang C C, Li J Q, et al. Dissolved organic matter in urban stormwater runoff at three typical regions in Beijing: chemical composition, structural characterization and sources identification[J]. RSC Advances, 2015,5:73 490-73 500.
[5] 田林锋, 胡继伟, 李存雄, 等. 通过 DOM 的光谱特性对长江源头典型高原深水湖泊进行评价[J]. 中国工程科学, 2010,12(6):80-84.
[6] Sonia R G B,Jorge Wagner J B. Origin of dissolved organic carbon studied by UV-Vis spectroscopy [J]. Acta Hydrochimica et Hydrobiologica,2003,31(6):513-518.
[7] Minero C, Lauri V, Falletti G, et al.Spectrophotometric characterization of surface lakewater samples: implications for the quantification of nitrate and the properties of dissolved organic matter[J].Annali di Chemica,2007,97(10):1 007-1 116.
[8] 陶澍,崔军,张朝生.水生腐殖酸的可见-紫外光谱特征[J].地理学报,1990,454:484-489.
[9] Miller C,Gordon K G, Kieber R J,et al.Chemical characteristics of chromophoric dissolved organic matter in rainwater[J].Atmospheric Environment,2009,43(15):2 497-2 502.
[10] Santos P S M,Santos E B H,Duarte A C. First spectroscopic study on the structural features of dissolved organic matter isolated from rainwater in different seasons [J]. Science of the Total Environment,2012,426:172-179.
[11] Kieber R J,Whitehead R F,Reid S N,et al. Chromophoric dissolved organic matter ( CDOM ) in rainwater, southeastern North Carolina,USA [J]. Journal of Atmospheric Chemistry,2006,54(1):21-41.
[12] 赵晨. 北京城区径流雨水中DOM表征及其与铜离子相互作用研究[D].北京:北京建筑大学,2016.
[13] 杨楠, 于会彬,宋永会,等.应用多元统计研究城市河流沉积物孔隙水中 DOM 紫外光谱特征[J].环境科学学报,2014,35(7):1 751-1 757.
[14] Muller C L,Baker A,Hutchinson R,et al. Analysis of rainwater dissolved organic carbon compounds using fluorescence spectrophotometry [J]. Atmospheric Environment,2008,42(34):8 036-8 045.
[15] Cory R M,Miller M P,McKnight D M,et al. Effect of instrument-specific response on the analysis of fulvic acid fluorescence spectra [J]. Limnology and Oceanography:Methods,2010,8:67-78.
[16] Vignudelli S,Santinelli C,Murru E,et al. Distributions of dissolved organic carbon ( DOC ) and chromophoric dissolved organic matter ( CDOM ) in coastal waters of the northern Tyrrhenian Sea ( Italy)[J].Estuarine,Coastal and Shelf Science,2004,60(1):133-149.
[17] Huguet A,Vacher L,Relexans S,et al. Properties of fluorescent dissolved organic matter in the Gironde Estu-ary[J]. Organic Geochemistry,2009,40(6):706-719.
[18] Toming K, Tuvikene L, Vilbaste S, et al. Contributions of autochthonous and allochthonous sources to dissolved organic matter in a large, shallow, eutrophic lake with a highly calcareous catchment[J]. Limnology and Oceanography, 2013,58(4):1 259-1 270.
[19] 132 Seitzinger S P, Styles R M, Lauck R, et al. Atmospheric pressure mass spectrometry: A new analytical chemical characterization method for dissolved organic matter in rainwater[J]. Environmental Science & Technology, 2003,37(1):131-137.
[20] McKnight D M, Boyer E W, Westerhoff P K, et al. Spectrofluorometric characterization of dissolved organic matter for indication of precursor organic material and aromaticity[J]. Limnology and Oceanography, 2001,46(1):38-48.
[21] 肖隆庚, 陈文松, 陈国丰, 等. 中国南海CDOM三维荧光光谱特征研究[J]. 环境科学学报, 2014,34(1):160-167.
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