Influence of Chlorination on Chromophores and Fluorophores in Humic Substances

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題名:	Influence of Chlorination on Chromophores and Fluorophores in Humic Substances
作者:	Korshin, Gregory V.;Kumke, Michael U.;李奇旺;Li, Chi-wang;Frimmel, Fritz H.
貢獻者:	淡江大學水資源及環境工程學系
日期:	1999-03-01
上傳時間:	2010-03-26 16:45:49 (UTC+8)
出版者:	American Chemical Society (ACS)
摘要:	Three types of fluorophores (decay times 1.2, 4.3, and 10.7 ns, respectively) participate in the fluorescence of Suwannee River hydrophobic acid (HPOA). The emission of the fast-decaying fluorophores (FDF) is red-shifted compared with that of longer-decaying groups. Upon chlorination, the FDF contribution (IFDF) to the emission declines, the specific absorbance at 254 nm (SUVA254) decreases, and the electron-transfer absorbance band in the UV spectra of HPOA contracts. On the basis of the literature data and experimental evidence, the width of the electron-transfer absorbance band (ΔET) is found to be proportional to the gyration radii (Rg) of the humic molecules. The Rg values of chlorinated HPOA are also well-correlated with the energy of the emission band maximum (Emax) and emission bandwidth (Δem). These consistent changes reflect the destruction of aromatic halogen attack sites accompanied by the breakdown of the humic molecules into smaller fragments.
關聯:	Environmental science and technology 33(8), pp.1207-1212
DOI:	10.1021/es980787h
顯示於類別:	[水資源及環境工程學系暨研究所] 期刊論文

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