阴离子对城市污水二级出水DOM光谱特性影响
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摘要
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SO_4~(2-)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0.005~0.1mol·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,UV_(254),UV_(253)/UV_(203),α_(300)和α_(250)/α_(365)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,R~2为0.949;对α_(350)和α_(355)影响不大。结果表明,投加SO_4~(2-)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 SO_4~(2-) 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 UV_(254)(0.994),UV_(253)/UV_(203)(0.987),α_(300)(0.998)and α_(250)/α_(365)(0.995).And it had the negative correlation with BIX as the determination coefficients was 0.949.However,it had no significant effect on α_(350) and α_(355).In conclusion,the addition of SO_4~(2-) 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.
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 SO_4~(2-) 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 UV_(254)(0.994),UV_(253)/UV_(203)(0.987),α_(300)(0.998)and α_(250)/α_(365)(0.995).And it had the negative correlation with BIX as the determination coefficients was 0.949.However,it had no significant effect on α_(350) and α_(355).In conclusion,the addition of SO_4~(2-) 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.
引文
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[9]Huguet A,Vacher L,Relexans S,et al.Organic Geochemistry,2009,40(6):706.
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[11]Huovinen P S,PenttilH,Soimasuo M R.Chemosphere,2003,51(3):205.
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[16]XU Hui-min,HE Guo-fu,XIANG Wei-ning,et al(徐慧敏,何国富,象伟宁,等).Environmental Science&Technology(环境科学与技术),2014,37(9):110.
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[18]Mobed J J,Hemmingsen S L,Autry J L,et al.Environmental Science and Technology,1996,30(10):3061.
[19]ZHOGN Tong-sheng,HU Li-chun,HU Sai-chun,et al(钟桐生,胡立纯,胡赛纯,等).Journal of Hunan City University·Natural Science(湖南城市学院学报·自然科学版),2009,18(4):39.
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[21]YANG Yi,LAN Ya-qiong,JIN Peng-kang,et al(杨毅,兰亚琼,金鹏康,等).Chinese Journal of Environmental Engineering(环境工程学报),2014,8(4):202.
[22]Frank C,Meier D,VoD,et al.Methods in Oceanography,2014,9:34.
[23]LI Yi-jie,SONG Gui-sheng,HU Su-zheng,et al(李奕洁,宋贵生,胡素征,等).Oceanologia et Limnologia Sinica(海洋与湖泊),2015,46(3):671.