Zhou Shi-Lei, Sun Yue, Yuan Shi-Chao, Peng Rui-Zhe, Liu Shi-Chong, Yue Ge-Cheng, Zhang Hang, Wang Zhou-Qiang, Li Zai-Xing, Luo Xiao
Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
Huan Jing Ke Xue. 2020 Jun 8;41(6):2635-2645. doi: 10.13227/j.hjkx.201911274.
The chromophoric dissolved organic matter (CDOM), the main component of dissolved organic matter, affects the morphological characteristics, migration, and conversion of pollutants in water. Based on UV-vis spectra and excitation emission matrix spectroscopy (EEMs) combined with the parallel factor analysis (PARAFAC), the spatial distribution and spectral characteristics were investigated and source analysis of CDOM was performed. Thus, the spatiotemporal differences in the CDOM in Gangnan Reservoir were analyzed. Results showed that , , , and exhibited significant seasonal differences in Gangnan Reservoir, and the order of CDOM concentrations was summer > spring > autumn > winter. There are significant seasonal differences in the E2/E3, E3/E4, E4/E6, and of interstitial water CDOM. The concentrations of E2/E3, E3/E4, E4/E6, and were high in winter and low in summer. E2/E3 and E3/E4 in autumn and winter were significantly higher than those in spring and summer, and the E3/E4 in autumn and winter was greater than 3.5, which indicates that the CDOM of the autumn and winter sediments has a smaller molecular weight and a lower degree of humification. Protein-like substances (C1), short-wave fulvic acid (C2), and degraded humic substances (C3) were identified by the PARAFAC model, and there was a significant positive correlation among the three fluorescent components (<0.001). The total fluorescence intensity of CDOM and the fluorescence intensity of each fluorescent component show significant seasonal differences. The total fluorescence intensity and the fluorescence intensity of each component show the highest levels in spring, followed by autumn and winter, and the lowest levels in summer. The proportion of each fluorescent component in autumn and winter and that of each fluorescent component in spring and summer showed no significant difference. There was a significant difference in the proportion of each fluorescent component between autumn/winter and spring/summer. The BIX and FI of CDOM for autumn and winter were higher than those for spring and summer, indicating that the autogenous source of CDOM in autumn and winter is stronger than that in spring and summer, which was consistent with the result of HIX. PCA and Adonis analysis showed that the spectral characteristics of CDOM exhibited obvious seasonal differences (<0.001). Moreover, the C1, C2, and C3 and water quality parameters (NH, NO, NO, TDN, and TDP) exhibited significant correlation based on linear regression. The results could provide technical support for the control of organic carbon pollution sources and water quality management in Gangnan Reservoir.
发色溶解性有机物（CDOM）作为溶解性有机物的主要成分，影响着水中污染物的形态特征、迁移和转化。基于紫外可见光谱和激发发射矩阵光谱（EEMs）并结合平行因子分析（PARAFAC），对CDOM的空间分布和光谱特征进行了研究，并进行了CDOM的源分析。由此，分析了岗南水库CDOM的时空差异。结果表明，岗南水库的 、 、 和 呈现出显著的季节差异，CDOM浓度顺序为夏季＞春季＞秋季＞冬季。间隙水CDOM的E2/E3、E3/E4、E4/E6和 存在显著的季节差异。E2/E3、E3/E4、E4/E6和 的浓度冬季高、夏季低。秋冬季节的E2/E3和E3/E4显著高于春夏季节，秋冬季节的E3/E4大于3.5，这表明秋冬沉积物中的CDOM分子量较小、腐殖化程度较低。通过PARAFAC模型识别出类蛋白物质（C1）、短波富里酸（C2）和降解腐殖质（C3），三种荧光组分之间存在显著正相关（<0.001）。CDOM的总荧光强度和各荧光组分的荧光强度呈现出显著的季节差异。总荧光强度和各组分荧光强度在春季最高，其次是秋季和冬季，夏季最低。秋冬各荧光组分的比例与春夏各荧光组分的比例无显著差异。秋冬与春夏各荧光组分的比例存在显著差异。秋冬CDOM的BIX和FI高于春夏，表明秋冬CDOM的自生来源强于春夏，这与HIX结果一致。主成分分析（PCA）和Adonis分析表明，CDOM的光谱特征呈现出明显的季节差异（<0.001）。此外，基于线性回归分析得出，C1、C2和C3与水质参数（NH、NO、NO、TDN和TDP）呈现出显著相关性。研究结果可为岗南水库有机碳污染源控制和水质管理提供技术支持。
