Abstract
Synchronous fluorescence spectroscopy of dissolved organic matter (DOM) in surface waters is investigated as a method of inferring DOM composition. The synchronous fluorescence technique, which has previously been shown to provide structural information for polycyclic hydrocarbons, including crude oils, has been extended to DOM as a method for “fingerprinting” humic substance (HS) types. Fluorescence emission and synchronous fluorescence data were collected for 21 lake water samples. The lake sample synchronous spectra, which are compared with synchronous spectra of lignin and data derived from the literature of other model compounds, provide new insights into the structure of surface water DOM. Further support for this approach is provided by a comparison between the multiple linear regression result found when relating measured pH to fluorescence emission data (R 2 = 0.75) and that found when relating the measured pH to synchronous fluorescence data (R 2 = 0.90). Adapting the synchronous fluorescence spectral technique to a remote sensing context is discussed in terms of using the method for choosing optimal excitation wavelengths for a multiple-wavelength lidar.
Published Version
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