期刊
ANALYTICA CHIMICA ACTA
卷 706, 期 2, 页码 261-267出版社
ELSEVIER
DOI: 10.1016/j.aca.2011.08.037
关键词
Dissolved organic matter (DOM); Sample preservation; Optical properties; Molecular composition; Ultrahigh resolution mass spectrometry of DOM; UV-vis spectroscopy; Excitation-emission matrix fluorescence spectroscopy
资金
- U.S. National Science Foundation [NSF-EAR-0628349]
- National High Field FT-ICR Facility [NSF-DMR-06-54118]
Acidification is a common method for preserving dissolved organic matter (DOM) in natural water samples until sophisticated laboratory analyses can be performed. However, little is known about the effects of this practice on the composition and optical properties of DOM. In this study, the effects of acidification on DOM in porewater samples collected from the RL IV bog system of the Glacial Lake Agassiz Peatlands in northern Minnesota were characterized. Molecular composition was determined by ultrahigh resolution mass spectrometry and optical properties by UV absorption and three-dimensional fluorescence spectroscopy. Excitation-emission matrix fluorescence spectroscopy results indicate that the fluorescence properties of the peatland porewater DOM were sensitive to pH and that the observed changes were fluorophore dependent. Ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry revealed the appearance of newly formed, oxygen-rich compounds upon acidification. The extent to which these oxygen-rich compounds were formed was also dependent on the composition of the DOM. (C) 2011 Elsevier B.V. All rights reserved.
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