Effects of water chemistry and concentrations of dissolved organic matter on its fluorescence characteristics and molecular conformation |
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| Authors: | Yi Mei Liying Wang Fengchang Wu |
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| Institution: | [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 |
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| Abstract: | 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. |
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| Keywords: | effect of water chemistry dissolved organic matter fluorescence characteristic |
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