引用本文:席银,赵海超,王圣瑞,肖尚斌,张莉,李艳平,李文章,等.覆盖金属氧化物对湖泊沉积物溶解性有机质特征的影响[J].环境科学研究,2017,30(6):884-891.
XI Yin,ZHAO Haichao,WANG Shengrui,XIAO Shangbin,ZHANG Li,LI Yanping,LI Wenzhang,et al.Dissolved Organic Matter Characteristics Affected by Covering Metal Oxides on Surface of Lake Sediment[J].Reserrch of Environmental Science,2017,30(6):884-891.]
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覆盖金属氧化物对湖泊沉积物溶解性有机质特征的影响
席 银1,2, 赵海超4, 王圣瑞1,2,3, 肖尚斌1, 张 莉2, 李艳平2, 李文章1,2
1.三峡大学水利与环境学院, 湖北 宜昌 443002 ;2.中国环境科学研究院湖泊创新基地, 湖泊水污染治理与生态修复技术国家工程实验室, 北京 100012 ;3.北京师范大学水科学研究院, 北京 100875 ;4.河北北方学院农林科技学院, 河北 张家口 075131
摘要:
为揭示不同金属氧化物对湖泊沉积物DOM(溶解性有机质)影响机制,通过室内模拟试验,在沉积物表层分别覆盖Fe、Al、Mn氧化物及湖沙后培养1 a,并利用三维荧光和紫外光谱方法进行表征. 结果表明:①覆盖Al、Fe、Mn氧化物和湖沙主要降低了0~3 cm沉积物的w(DOC),降幅分别为8.61%、6.27%、22.38%和0.44%. ②沉积物中DOM的类络氨酸峰(peak B1)和类色氨酸峰(peak T2)均产生较大变化. 其中三种氧化物均显著降低了上层沉积物中DOM的peak T2,使底层DOM的peakT2显著增加. Mn氧化物使DOM的peak B1降低,Fe和Al氧化物使DOM的peak B1增加,湖沙则使两类峰均降低. ③覆盖金属氧化物改变了沉积物DOM结构特征,其中覆盖Fe氧化物增强了其芳香性,而覆盖Mn氧化物和Al氧化却降低其芳香性,但三者均使DOM腐质化程度及官能团数量增加,并使FI(Fluorescence Index,荧光指数)增大,表明DOM向生物源转化. 研究显示,沉积物表层覆盖金属氧化物影响了沉积物中DOM迁移和转化,并促进了其降解,导致其分子量和腐殖化程度增加.
关键词:  金属氧化物  沉积物  溶解性有机质  三维荧光光谱  紫外光谱
DOI:
分类号:
基金项目:国家自然科学基金项目(U1202235,3);国家水体污染控制与治理科技重大专项(2012ZX07105-004)
Dissolved Organic Matter Characteristics Affected by Covering Metal Oxides on Surface of Lake Sediment
XI Yin1,2, ZHAO Haichao4, WANG Shengrui1,2,3, XIAO Shangbin1, ZHANG Li2, LI Yanping2, LI Wenzhang1,2
1.China Three Gorges University, College of Hydraulic & Environmental Engineering, Yichang 443002, China ;2.National Engineering Laboratory for Lake Water Pollution Control and Ecological Restoration Technology, Research Center of Lake Eco-Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China ;3.College of Water Sciences, Beijing Normal University, Beijing 100875, China ;4.Department of Agricultural Science, Hebei North University, Zhangjiakou 075131, China
Abstract:
Abstract: Indoor simulation experiments covering sediment surfaces with iron, aluminum, manganese oxide and lake sand for a year were conducted to investigate the impact mechanism of metal oxidex on sediment dissolved organic matter (DOM) by three dimensional fluorescence spectrum and ultraviolet-visible spectrum. The obtained results showed that:(1) the sediment DOC content of 0-3 cm depth decreased by 8.61%, 6.27%, 22.38% and 0.44% in the samples covered with Al, Fe, Mn oxide and lake sand, respectively. (2) The tyrosine peak (peak B1) and tryptophan peak (peak T2) in the sediment DOM varied greatly. Three oxides significantly reduced the peak T2 of the surface sediments DOM, and significantly increased the peak T2 of the underlying DOM; the Mn oxide reduced the peak B1 of the DOM, and the Fe and Al oxides increased the peak B1 of the DOM. The two peak types decreased by covering with lake sand. (3) The coverage by metal oxides changed the structure of sediment DOM, whereas the coverage of Fe oxides enhanced its aroma, while covering with manganese oxides and aluminum oxide reduced its fragrance. However, the three oxides increased the degree of DOM and the number of functional groups, increased FI value and promoted the DOM transformation to biological sources. The results showed that the sediment surface covered with metal oxides affected the sediment DOM migration and transformation, and promoted its degradation, resulting in increments of molecular weight and humification degree.
Key words:  metal oxides  sediment  dissolved organic matter  three-dimensional fluorescence spectroscopy  UV spectrum