Use of electron spectroscopy to reveal structural differences between humus acids from virgin and arable gray forest soils

Issues related to the information stored in the electronic spectra of humus acids were considered. The spectrum recording procedure for revealing even small structural changes in the chromophore groups containing the C=C and C=O bonds is discussed. The effect of methods used for separation and purification of humus acids on their spectral and chemical properties is described. Differences in the polarizability and reactivity of humus substances from virgin and arable gray forest soils are revealed.