摘要
采用三维荧光-平行因子及二维相关光谱,研究城市河流溶解性有机质(DOM)组成及变动。以沈阳市城市河流——蒲河为研究对象,采集清洁区河段、工业区河段和生活区河段上覆水,检测DOM三维荧光光谱。荧光指数、自生源指数和腐殖化指数分析结果表明,蒲河DOM以内源为主,而工业区和生活区河段同时受外源影响,腐殖化程度较弱。采用平行因子提取类富里酸(C1和C2)、类胡敏酸(C3)、类色氨酸(C4和C6)和酚类物质(C5)6个DOM荧光组分,蒲河DOM以类富里酸(37.91%~43.82%)和类色氨酸(23.64%~33.60%)为主。清洁区河段各组分含量小于生活区和工业区河段。二维相关光谱分析表明,工业区河段类色氨酸含量变化幅度比类富里酸大,生活区河段变化规律与工业区河段相同,而清洁区河段相反,这表明工业区和生活区河段有大量生活污水和工业废水汇入。基于主成分分析(PCA)结果,C1~C5为影响DOM的主要因子(55.15%),工业区河段点位得分最高,其次为生活区河段,清洁区河段最小,表明工业区和生活区河段深受人类活动影响,而清洁区河段受人类影响较弱。
Three-dimensional excitation-emission matrix(EEM)fluorescence spectroscopy combined with parallel factor analysis(PARAFAC)and two-dimensional correlation spectroscopy(2D-COS)was applied to characterize structural composition and changes of the dissolved organic matter(DOM)in the urban river in Shenyang City.Water samples were collected from Puhe River,where the sampling sites 1#to 3#were located in the clean region,the sampling sites 4#to 6#in the industrial region,and the sampling sites 7#to 9#in the residential area.The EEMs of DOM were measured,from which fluorescence index(FI),autochthonous index(BIX)and humification index(HIX)were deduced.Based on the analysis of FI,BIX and HIX,DOM was mainly autotrophic source,while DOM in the industrial and the residential regions were also affected by terrestrial sources,and the degree of humification was relatively weak.Using PARAFAC,the six fluorescent components were extracted,i.e.fulvic-like(C1 and C2),humic-like(C3),tryptophan-like(C4 and C6)and phenolic substances(C5),of which fulvic-like(37.91%-43.82%)and tryptophan-like(23.64%-33.60%)were the main components.Based on 2D-COS,the variation order of fulvic-like and tryptophan-like in the industrial region was tryptophan-like→fulvic-like,so was the residential region.However the change order in the clean region was opposite to the industrial and residential regions,indicating that the variations of the tryptophan-like in the former were larger than those in the latter.This indirectly verified that there was a large amount of domestic sewage and industrial wastewater entering into the river from the industrial and the residential region.Based on the principal component analysis(PCA),C1-C5 were the main potential factors affecting DOM(55.15%).The scores of the sampling sites were the highest in the industrial region,followed by the residential region and the clean region.It showes that the river sections in the industrial and the residential regions were deeply affected by human activities,while the river sections in the clean region were less affected by human activities.
作者
崔兵
高红杰
郑昭佩
于会彬
CUI Bing;GAO Hong-jie;ZHENG Zhao-pei;YU Hui-bin(College of Geography and Environment,Shandong Normal University,Jinan 250358,China;Watershed Research Center for Comprehensive Treatment of Water Environmental Pollution,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2021年第3期369-377,共9页
Journal of Ecology and Rural Environment
基金
水体污染控制与治理科技重大专项(2018ZX07111)
中国博士后科学基金(2013T60148)。
