Characteristics and source identification of the dissolved organic matter in the lakes of west Jiangsu by spectroscopy
Characteristics and source identification of the dissolved organic matter in the lakes of west Jiangsu by spectroscopy
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DOI：
10.18307/2012.0214
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Chen Xiaofeng;Chuai Xiaoming;Liu Tao;Y. Liuyan
中科院分区：
文献类型：
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作者：
Chen Xiaofeng;Chuai Xiaoming;Liu Tao;Y. Liuyan
采用紫外-可见分光光度法和荧光光谱法对苏西部分湖泊溶解性有机物(DOM)的组成和来源进行了研究。254 nm和280 nm处的比紫外吸收(SUVA)表明，DOM的芳香度和分子量大小依次为：少波湖、天岗湖、白马湖、石臼湖、洪泽湖、古城湖、骆马湖、高邮湖和宝应湖。 E2/E3和E3/E4值表明，少波湖和白马湖的DOM结构复杂，以腐殖酸为主要成分，而其他湖泊的DOM复杂程度较低，主要由黄腐酸组成。指数斜率参数（S275-295nm）值结果与SUVA、E2/E3和E3/E4得出的结论一致。这些湖泊DOM的荧光指标和生物指标范围为分别为1.13-1.30、0.47-0.67，表明DOM具有较强的陆地来源。不同峰的单位有机碳荧光强度之间存在显着相关性，表明这些湖泊中的腐殖质和类蛋白质物质具有相似的来源。结合这些湖泊的特征和经济发展情况，可以推断这些湖泊中的大部分DOM是由农业及其下游工业产生的，随流入河流汇入。
The composition and origin of the dissolved organic matter(DOM) in some lakes of west Jiangsu was investigated using UV-Vis absorbance and fluorescence spectroscopy.The specific ultraviolet absorption(SUVA) at 254 nm and 280 nm indicated that the aromaticity and molecular weight of DOM ranked in the order of Lake Shaobo,Lake Tiangang,Lake Baima,Lake Shijiu,Lake Hongze,Lake Gucheng,Lake Luoma,Lake Gaoyou and Lake Baoying.The E2/E3 and E3/E4 values suggested that the DOM of Lake Shaobo and Lake Baima was structural complex with humic acid being the primary component,while other lakes' DOM was less complex and constituted mostly by fulvic acid.The exponential slope parameter(S275-295nm) values results were consistent with the conclusion obtained from SUVA,E2/E3 and E3/E4.Fluorescence indexes and biological index of these lakes' DOM were ranged of 1.13-1.30,0.47-0.67,respectively,suggesting DOM a strong terrestrial origin.Significant correlation was found between the fluorescence intensities per unit organic carbon at different peaks,which indicated that the humic-like and protein-like materials in these lakes have a similar source.Considered the characterization of these lakes and the economic development,it can be deduced that most of these DOM are produced by agriculture and its downstream industries and imported with inflow rivers.