Seasonal changes of group composition of low-mineralized peloids in Samara region as indicator of its biological activity

The seasonal fluctuations of different groups of humic substances of low-mineralized silt sulphide mud are studied, as an indicator of biological activity period. It is found that movable groups are characterized by most persistence, which represented himatomelanic and fulvic acids. The results allow to predict the same biological activity of peloids, due to the presence of humic substances regardless of the season of mud fence.