利用三维荧光光谱法和紫外光谱法, 研究阴离子对城市污水二级出水DOM光谱的影响, 为环境中DOM分析提供数据基础。 结果表明: 投加SO2-4和Cl-使二级出水DOM荧光峰强度小幅度增强或降低。 投加NO-3浓度在0.005～0.1 mol·L-1时, 出现代表可见光区类腐殖质的荧光峰。 随投加NO-3浓度增大, 荧光强度显著降低; 代表类腐殖质荧光峰的激发波长和发射波长与紫外吸收峰右侧红移。 NO-3投加浓度与HIX, UV254, UV253/UV203, α300和α250/α365呈较强的正相关性, 决定系数分别为0.993, 0.994, 0.987, 0.998和0.995; 与BIX呈负相关性, R2为0.949; 对α350和α355影响不大。 结果表明, 投加SO2-4和Cl-对二级出水DOM的荧光(除荧光强度外)和紫外特性影响较小。 样品NO-3浓度不同时, 用荧光参数和紫外参数衡量不同DOM来源和性质时将产生一定影响。

This study investigated how the anions had the effect on the spectral characteristics of dissolved organic matter (DOM) of secondary effluent from municipal wastewater treatment by using three-dimensional fluorescence spectroscopy and UV spectrophotometry in order to provide the data foundation for DOM’s environmental behavior. The results showed that the addition of SO2-4 and Cl- could increase or decrease the fluorescence intensity of DOM’s fluorescence peaks. In addition, the fluorescence peak representing the visible humus-like was observed with the additional concentration of NO-3 with 0.005~0.1 mol·L-1. Moreover, the fluorescence intensity of each fluorescence peak decreased obviously with the increase of NO-3 concentration, and the excitation and emission wavelengths of the fluorescence peaks representing the humus-like were red shifted with the right side of UV absorption peak. The added NO-3 concentration was positively correlated with HIX with the determination coefficient of 0.993. This was similar to that with UV254(0.994), UV253/UV203(0.987), α300(0.998) and α250/α365(0.995). And it had the negative correlation with BIX as the determination coefficients was 0.949. However, it had no significant effect on α350 and α355. In conclusion, the addition of SO2-4 and Cl- had little effect on the fluorescence and UV characteristics of secondary effluent DOM except fluorescence intensity. When the concentrations of NO-3 in the samples were different, it had a certain effect on analyzing the source and the properties of the different DOMs by using fluorescenct parameters and UV parameters.