engleski

ASFit - an all-inclusive tool for analysis of UV-Vis spectra of colored dissolved organic matter (CDOM)

The study of dissolved organic matter (DOM) in natural waters is hindered by their complex structure and the creation of molecular aggregates. Spectroscopic methods are most commonly used for its characterization due to their simplicity, rapid response, low price and high sensitivity. This applies primarily to fluorescence spectroscopy and UV/Vis spectrometry. While absorbance intensity gives information about CDOM concentration, shape of the spectrum might provide insight into its composition. Therefore, study of spectral changes provides useful information in distinguishing sources, determining degree of degradation as well as in studying the interactions of DOM with metals and disinfectants. For this purpose, various approaches for the characterization of the absorption spectra have been proposed over the years. There is over 20 different features (parameters) which were derived from UV/Vis spectra to get insight into the properties and/or signatures of CDOM in natural waters. There is still no general agreement among scientists on the justification of all these parameters, partly because many of them are found to be "site specific". Although analysis of UV/Vis spectra is relatively simple, there are numerous "combinations" to treat the raw spectra. Here we present a new, windows-based "all-inclusive" tool for the basic treatment of spectra, various parameters calculation (data handling methods) and interactive graphical presentation of CDOM UV/Vis spectra.

Dissolved organic matter ; UV/Vis spectroscopy ; Software

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