Zhou Shi-Lei, Zhang Yi-Ran, Huang Ting-Lin, Liu Yan-Fang, Zhang Lei, Li Gui-Xia, Yue Lin, Luo Xiao
Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Huan Jing Ke Xue. 2019 Jan 8;40(1):172-184. doi: 10.13227/j.hjkx.201805215.
Based on excitation emission matrix spectroscopy (EEMs) technology combined with parallel factor analysis (PARAFAC) and UV-Vis spectra, we analyzed the spectral characteristics and sources of dissolved organic matter (DOM) in rainwater with different DOC molecular weight in summer and autumn in the Zhoucun Reservoir. The results show that the UV-Vis absorption spectrum of DOM have no notably characteristic peak and the variation coefficient of the absorption coefficient ranges between 75% and 469%, which shows the properties of DOM with different molecular weight. The changes of and E3/E4 show that the relative concentration of DOM and the proportion of fulvic acid in DOM both increase from summer to autumn, respectively; Two humic-like substances (C1, C2), one fulvic-like substance (C3), and one protein-like substance (C4) were identified with the PARAFAC model, with a significant correlation coefficient (<0.01) in C1&C2/C3/C4 and C2&C3, respectively. The total DOM fluorescence intensity and the fluorescence intensity of each component exhibit significantly different distributions (<0.01). Moreover, C1+C2 account for the majority proportion of DOM and C3 and C4 exhibit an increase and decrease from summer to autumn, respectively. The rainwater in summer and autumn both exhibita strong autochthonous component characteristics and the summer rainwater has higher autochthonous characteristics. The PCA shows that the spectral characteristics of the rainwater exhibit notable differences. Moreover, C1, C2, and C3 exhibit a significant correlation coefficient (<0.01) with DOM indices[HIX, Fn(355), Fn(280), E3/E4, ] and water quality parameters. The results contribute to the future exploration and control of organic carbon pollution sources by managers of the Zhoucun Reservoir.
基于激发发射矩阵光谱（EEMs）技术结合平行因子分析（PARAFAC）和紫外可见光谱，我们分析了周村水库夏秋两季不同DOC分子量雨水中溶解有机物（DOM）的光谱特征和来源。结果表明，DOM的紫外可见吸收光谱无明显特征峰，吸收系数变异系数在75%至469%之间，体现了不同分子量DOM的性质。 及E3/E4的变化表明，DOM的相对浓度和DOM中富里酸的比例分别从夏季到秋季增加；利用PARAFAC模型识别出两种类腐殖质（C1、C2）、一种类富里酸物质（C3）和一种类蛋白质物质（C4），C1&C2/C3/C4和C2&C3的相关系数分别显著（<0.01）。总DOM荧光强度和各组分荧光强度呈现出显著不同的分布（<0.01）。此外，C1+C2占DOM的大部分比例，C3和C4分别从夏季到秋季呈现增加和减少趋势。夏秋两季雨水均表现出较强的自生源组分特征，且夏季雨水的自生源特征更高。主成分分析（PCA）表明，雨水的光谱特征存在显著差异。此外，C1、C2和C3与DOM指标[HIX、Fn(355)、Fn(280)、E3/E4， ]和水质参数具有显著的相关系数（<0.01）。这些结果有助于周村水库管理者未来对有机碳污染源的探索和控制。
