Binding characteristics of perylene, phenanthrene and anthracene to different DOM fractions from lake water  

作　　者：MEI Yi WU Fengchang WANG Liying BAI Yingchen LI Wen LIAO Haiqing 

机构地区：[1]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Bering 100012, China

出　　处：《Journal of Environmental Sciences》2009年第4期414-423,共10页环境科学学报（英文版）

基　　金：supported by the National Basic Research Program (973) of China (No. 2008CB418200);the National Knowledge Innovation Program of Chinese Academy of Sciences (No. KZCX2-yw-102);the National Natural Science Foundation of China (No.40525011, 40632011)

摘　　要：Six hydrophobic and hydrophilic fractions were isolated using XAD-8 and XAD-4 resins, and were extensively characterized. Partition coefficients of perylene, pbenanthrene and anthracene binding to the six fractions were determined by fluorescence quenching titration. The Kdo~ values obtained for the polycyclic aromatic hydrocarbons （PAHs） binding to the hydrophobic fractions were larger than those to the hydrophilic fractions. Nonlinear Stem-Volmer plots were observed when binding phenanthrene and anthracene to some hydrophilic fraction samples, suggesting saturation of polar interaction binding sites. A significant correlation of logKdo~ values with molecular weights and molar absorptivities at 280 nm was observed, while atomic ratio of C/t-I was found to be a poor indicator for aromaticity. Other structural descriptors such as paraffinic carbon and polarity influenced the DOM-fraction ability to bind PAHs. Different interaction mechanisms underlying binding of the different fractions to the PAHs were also discussed.Six hydrophobic and hydrophilic fractions were isolated using XAD-8 and XAD-4 resins, and were extensively characterized. Partition coefficients of perylene, pbenanthrene and anthracene binding to the six fractions were determined by fluorescence quenching titration. The Kdo~ values obtained for the polycyclic aromatic hydrocarbons （PAHs） binding to the hydrophobic fractions were larger than those to the hydrophilic fractions. Nonlinear Stem-Volmer plots were observed when binding phenanthrene and anthracene to some hydrophilic fraction samples, suggesting saturation of polar interaction binding sites. A significant correlation of logKdo~ values with molecular weights and molar absorptivities at 280 nm was observed, while atomic ratio of C/t-I was found to be a poor indicator for aromaticity. Other structural descriptors such as paraffinic carbon and polarity influenced the DOM-fraction ability to bind PAHs. Different interaction mechanisms underlying binding of the different fractions to the PAHs were also discussed.

关 键 词：fluorescence quenching humic substances polycyclic aromatic hydrocarbons （PAHs） partition coefficient bindingcapacity 

分 类 号：O625.154[理学—有机化学] P231.5[理学—化学]