同温混合初期主库区沉积物间隙水DOM的光谱特征——以周村水库为例

发布时间：2018-06-29 16:22

本文选题：溶解有机质 + 间隙水　；参考：《中国环境科学》2016年10期

【摘要】：运用紫外-可见光谱技术以及结合平行因子分析法的三维荧光光谱(EEM-PARAFAC)技术,对周村水库秋末同温混合初期的沉积物间隙水中溶解性有机物(DOM)的光谱特征进行分析.结果表明:周村水库沉积物间隙水DOM的紫外-可见吸收光谱并无明显特征峰,吸收系数的变异系数在50%~330%之间,表明其性质在不同深度上存在差异;E2/E3、E3/E4随深度增加,说明富里酸所占DOM的比例随沉积物深度增加而升高;三维荧光光谱中分离了4个组分,分别为类富里酸(C1、C2)、类蛋白(C3)和类腐殖酸(C4);类蛋白(C3)与类腐殖酸(C4)具有显著的相关性(P0.01,R=0.905);DOM总荧光强度以及各组分荧光强度随着沉积物深度的增加均呈下降趋势,但DOM中腐殖质所占比例随深度逐渐增加,各样点间各荧光组分的荧光强度与组分比例差异显著;水库沉积物间隙水的高FI(1.8~2.0)和BIX(1.0),以及低HIX(4.0)的荧光特征指数,说明不同深度DOM的腐殖化程度低,均来源于微生物作用.
[Abstract]:The spectral characteristics of dissolved organic matter (Dom) in sediment interstitial water of Zhoucun Reservoir at the beginning of late autumn and at the same temperature were analyzed by means of UV-Vis spectroscopy and parallel factor analysis (EEM-PARAFAC). The results showed that the UV-Vis absorption spectra of the sediment interstitial water in Zhoucun Reservoir had no obvious characteristic peak, and the coefficient of variation of absorption coefficient was between 50% and 330%, indicating that the properties of Dom in the sediment interstitial water of Zhoucun Reservoir were different at different depths. The results showed that the proportion of fulvic acid to Dom increased with the increase of sediment depth, and four components were separated from the three dimensional fluorescence spectra. The total fluorescence intensity of Dom and the fluorescence intensity of each component decreased with the increase of sediment depth, and the correlation between C _ 1 C _ 2, C _ 3 and C _ 4, C _ 3 and C _ 4 was significant (P0.01 ~ (0.905), respectively, which were similar to those of C _ (1) C _ (2), C _ (3) and humic acid (C _ 4), respectively, and the correlation between C _ (3) and humic acid (C _ (4) was significant. However, the proportion of humus in Dom increased gradually with the depth, and the fluorescence intensity and component ratio of each fluorescence component were significantly different among different points, the high fi (1.8N 2.0) and Bix (1.0) of reservoir sediment interstitial water, and the low fluorescence characteristic index of fix (4.0) were found in the reservoir sediment interstitial water. The results showed that the humification degree of Dom in different depth was low and all originated from microbial action.
【作者单位】：西安建筑科技大学西北水资源与环境生态教育部重点实验室陕西省环境工程重点实验室;扬州大学环境科学与工程学院;
【基金】：国家自然科学基金(51478378) 国家科技支撑计划(2012BAC04B02)
【分类号】：X143

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