沉积物中溶解性有机质的垂直分布光谱特性

发布时间：2018-03-26 02:33

本文选题：沉积物　切入点：溶解性有机质　出处：《环境工程学报》2017年11期

【摘要】：采用紫外光谱和三维荧光光谱结合平行因子分析(PARAFAC)方法对瀛湖沉积物中溶解有机质(dissolved organic matters,DOM)垂直分布的光谱特性进行了分析,利用荧光指数(fluorescence index,FI)、腐殖化指数(humification index,HIX)和生物源指数(biological index,BIX)解析了沉积物中DOM荧光组分、空间分布特征和来源。紫外光谱结果表明:瀛湖沉积物的UV254值在0.14~0.30之间,最大值出现在深度10~11 cm处,深层(20 cm以下深度)沉积物UV254值趋于稳定。A250/A365比值在3.69~9.98之间,均值为5.36,表明瀛湖沉积物DOM以富里酸为主。三维荧光光谱结合平行因子分析结果表明:沉积物DOM包含3类4个荧光组分,即类腐殖质组分(C1和C2)、类蛋白组分(C3和C4),其中,类腐殖质组分的荧光强度约占全部组分荧光强度的60.7%;随着深度的增加,3个采样点的类蛋白质组分(C3和C4)的荧光强度均呈现下降趋势。FI、HIX和BIX都表明瀛湖沉积物DOM的来源主要是由沉积物中自生微生物活动产生。其中,FI在1.73~2.10范围内,BIX处于0.72~0.96范围内,HIX在1.39~4.72范围内。
[Abstract]:The spectral characteristics of the vertical distribution of dissolved organic matter (dissolved organic matter) in the sediments of Yinghu Lake were analyzed by means of UV and 3D fluorescence spectra combined with parallel factor analysis (PARAFAC), and the vertical distribution of dissolved organic matter (dissolved organic matter) in sediments of Yinghu Lake was analyzed. Fluorescence index (FIX), humification index (HI) and biogenic index (biologic index BIX) were used to analyze the fluorescence composition, spatial distribution and source of DOM in sediments. The UV spectra showed that the UV254 value of the sediments was between 0.14 and 0.30. The maximum value of UV254 appeared in the depth of 10 ~ 11 cm and the depth below 20 cm.) the UV254 value of sediment tended to be stable. The ratio of A250 / A365 was between 3.69 and 9.98. The mean value is 5.36, which indicates that the DOM of Yinghu Lake sediment is mainly fulvic acid. The results of 3D fluorescence spectrum and parallel factor analysis show that the sediment DOM contains three kinds of four fluorescent components, namely humus-like components C _ 1 and C _ 2, protein like components C _ 3 and C _ 4, among which, The fluorescence intensity of humus-like components accounted for about 60.7 of the total fluorescence intensity, and with the increase of depth, the fluorescence intensity of protein like components C _ 3 and C _ 4 of the three sampling sites showed a downward trend. The source was mainly generated by the autobiotic activities in sediments, and the BIX of the BIX in the range of 1.732.10 was within the range of 0.72 ~ 0.96 and the HIX was within the range of 1.39 ~ 4.72.
【作者单位】：中国环境科学研究院环境基准与风险评估国家重点实验室;
【基金】：国家水体污染控制与治理科技重大专项(2012ZX07101-002)
【分类号】：X52

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