The research of electronic spectrum absorbtion of peats' humic acids of Western Siberia middle taiga zone

The results of studies of humic acids electronic spectra for various types and kinds of peat in the middle-taiga zone of Western Siberia (Khanty-Man-siysk Autonomous Circle - Yugra) are presented in the study. It was found out that the increase in opti-cal density was observed in the samples of humic acids which were extracted from the peat with a high degree of decomposition (40-65 %). At the first approximation the interpretation of received electronic spectra gives reason to range humic ac-ids in the order with increasing proportion of aro-matic structures share in macromolecules in the following order: 1) peat humic acids having a de-gree of expansion from 0 to 35 % with the content of a large number of peat-forming plants, where the extinction coefficients vary from 0.039 to 0.054 or sphagnum peat with the same degree of decompo-sition with the sphagnum containing 95-100 %, where the extinction coefficients have values be-tween 0.030 and 0.042; 2) humic acids of all types and kinds of peat with a degree up to 35 %, where the extinction coefficients are from 0.042 to 0.068; 3) humic acids of peats of all examined types and species with a degree of decomposition from 40 % to 65 %, where the extinction coefficients vary from 0.059 to 0.087. Although the method of electron spectroscopy is an important tool in the study of humification processes in peat, it has a limited in-formative value due to unresolved spectra. Thus, peat humic acids with various botanical composi-tions and various degree of decomposition are cha-racterized by similar absorption spectra in the visi-ble area in the form of a monotone increasing of absorption in short wavelength interval and differ from each other only by the absorption intensity.