ELECTRONIC ABSORPTION SPECTRA OF HUMIC ACIDS OF PEATS IN KHANTY-MANSIYSK AUTONOMOUS DISTRICT OF YUGRA

摘要

The article reveals the results of studies of the electronic spectra of humic acids for various types and kinds of peats in the middle-taiga zone of Western Siberia (Khanty-Mansiysk Autonomous District of Yugra). It was found that the increase in optical density is observed in samples of humic acids that were extracted from the peat with a high degree of decomposition (40-65%). Although the method of electronic spectroscopy is an important tool in the study of humification processes in peats, it has a limited informative value due to unresolved spectra; however, it is a substantial addition and ties in well with the results of the element composition and resonance and thermal methods of humic acid analysis. Thus, peat humic acids with various botanical composition and various degree of decomposition are characterized by similar absorption spectra in the visible area in the form of a monotone increasing of absorption in short wavelength interval and differ from each other only by the absorption intensity.