Effects of water chemistry and concentrations of dissolved organic matter on its fluorescence characteristics and molecular conformation  

作　　者：MEI Yi WANG Liying WU Fengchang 

机构地区：[1]The State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [3]Chinese Research Academy of Environmental Sciences, Beijing 100012, China

出　　处：《Chinese Journal Of Geochemistry》2009年第4期413-420,共8页中国地球化学学报

基　　金：supported jointly by the National Knowledge Innovation Pro-gram of the Chinese Academy of Sciences (KZCX2-YW-102);the National Natural Science Foundation of China (40525011, 40632011)

摘　　要：Previous studies showed that water chemistry and concentrations of dissolved organic matter (DOM) could affect its molecular conformation and binding characteristics with hydrophobic organic contaminants (HOCs). However, the conformational change of DOM resultant from water chemistry and concentrations of DOM was not extensively investigated; therefore, the contradictory reports regarding the binding property with HOCs were available in literature. In this study, the effects of ionic strength, pH and DOM concentrations on the fluorescence properties of two humic acids (HA), namely Fluka HA and Amherst HA, were investigated by three-dimensional excitation-emission matrix fluorescence spectroscopy (3DEEM) and steady-state fluorescence polarization (FP) techniques. The results not only corroborated previous observations obtained by other investigators, but revealed some new information about the fluorescence properties and molecular conformation of the humic acids under different water chemistry and DOM concentration conditions, which could shed light on its binding mechanisms and binding properties with HOCs.Previous studies showed that water chemistry and concentrations of dissolved organic matter （DOM） could affect its molecular conformation and binding characteristics with hydrophobic organic contaminants （HOCs）. However, the conformational change of DOM resultant from water chemistry and concentrations of DOM was not extensively investigated; therefore, the contradictory reports regarding the binding property with HOCs were available in literature. In this study, the effects of ionic strength, pH and DOM concentrations on the fluorescence properties of two humic acids （HA）, namely Fluka HA and Amherst HA, were investigated by three-dimensional excitation-emission matrix fluorescence spectroscopy （3DEEM） and steady-state fluorescence polarization （FP） techniques The results not only corroborated previous observations obtained by other investigators, but revealed some new information about the fluorescence properties and molecular conformation of the humic acids under different water chemistry and DOM concentration conditions, which could shed light on its binding mechanisms and binding properties with HOCs.

关 键 词：有机物浓度 溶解有机质 分子构象 荧光特性 水化学 HOCS 有机污染物 DOM 

分 类 号：X799.303[环境科学与工程—环境工程] X131