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• W2389206853 abstract "在引江济太水系的调查基础上,分析了有色溶解有机质(CDOM)的吸收光谱、荧光特性及其主要来源,探讨了CDOM与pH、DO、叶绿素a等水质指标的关系。结果表明:水体吸收系数a(355)与CDOM浓度呈显著正相关,均具有明显的空间差异,它们在河道出入湖口及开阔湖区较低,而在望虞河和太浦河中游较高,这显然与中游河道受纳了两岸污水有关,S值也表明望虞河受外源输入影响最大。通过三维荧光激发-发射矩阵(EEM)分析,发现了5种荧光团,包括2种类蛋白荧光团和3种类腐殖质荧光团,其中类蛋白荧光(特别是T峰)明显强于类腐殖质荧光。研究发现,水体DO浓度、pH值均随CDOM浓度呈指数函数递减。荧光指数(FI)明显偏向生物来源(约1.9),因此,引江济太水系CDOM以生物的本地生产为主,河道局部污染水体中的类腐殖质荧光可能来源于污水微生物对藻类产生的溶解有机质的转化,在局部河道中也有-定的外源输入。;Based on the investigation of the water body of the drainage system of Water Diversion from Yangtze River to LakeTaihu, the absorbance spectrum and fluorescent characteristics of chromophoric dissolved organic matter(CDOM) and its sourcewere analyzed. The correlation between CDOM and some water quality indexes including pH,DO and chlorophyll-a concentrationswas discussed. The results showed that CDOM concentrations were positively correlated with their absorption coefficients at 355nmwith significantly spatial differences. S values also indicated that Wangyu River was affected by terrestrial input much more thanother areas. Five fluorophores were observed by three dimensional excitation emission matrix (3DEEM) fluorescence spectroscopyincluding UVC protein-like, UVB protein-like, UVA humic-like, UVB humic-like, and UVC humic-like fluorescent signals. Thefluorescence intensities of protein-like fractions(especially peak T) were much stronger than those of humic-like fractions. BothpH and DO concentrations exponentially decreased with CDOM concentrations. According to the correlation between chlorophyll-aconcentrations and CDOM concentrations, humic-like fluorescent signal might transformed by microorganisms. Fluorescence indexhad a value of about 1.9,therefore, CDOM could be dominated mainly by local microbial sources, and terrestrial input could bealso a source of CDOM for part of the rivers." @default.
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• W2389206853 date "2010-01-01" @default.
• W2389206853 modified "2023-10-17" @default.
• W2389206853 title "Characteristics and sources of CDOM in the drainage system of Water Diversion from Yangtze River to Lake Taihu" @default.
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• W2389206853 doi "https://doi.org/10.18307/2010.0109" @default.
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