光谱学与光谱分析 |
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Three-Dimensional Fluorescence Fingerprint for Source Determination of Dissolved Organic Matters in Polluted River |
ZHONG Run-sheng1,ZHANG Xi-hui2*,GUAN Yun-tao2,MAO Xian-zhong2 |
1. Department of Environmental Science & Engineering, Tsinghua University, Beijing 100084, China 2. Research Center for Environmental Engineering & Management, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China |
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Abstract Fluorescence fingerprint technique was used to characterize dissolved organic matter (DOM) in river from different sources. The results showed that two types of DOM fluorescence signals were observed in river water: a humic-like fluorescence with three maxima at λex/λem=250/460 nm(A1),220/400 nm(A2) and 325/420 nm(C); and a protein-like fluorescence with two maxima at λex/λem=230/360 nm(T2) and 285/357 nm(T1). The intensity of both of protein-like fluorescence distinctly increased because of the domestic wastewater drainage in the tributary stream. After the tributary converges into the main stream, the Fe3+ concentration in the main stream is 30 times as much as that of tributary stream, and the visible blue-shift of humic-like fluorescence occurred while the others didn’t occur. The intensity of all types of fluorescence decreased from source to estuary resulting from different solute chemistry. However, the intensities of humic-like fluorescence C, A1 and protein-like fluorescence T2 at the longer excitation wavelength decreased significantly because of dilution from main river stream and complexation of humic-like with Fe3+,thus the peaks disappeared at the estuary while the fluorescence peaks at the shorter excitation wavelength were relatively stable on which the river solute chemistry had little effect. Therefore, the fluorophores at the shorter excitation wavelength of 220-230 nm area potential tool to determine the sources of DOM in polluted river.
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Received: 2006-09-08
Accepted: 2006-12-08
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Corresponding Authors:
ZHONG Run-sheng
E-mail: xihuizh@mail.tsinghua.edu.cn
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