Home – Home – Jornals – Chemistry for Sustainable Development 2021 number 1

The territories of discharge of ascending deep thermal waters are a unique object for studying the mineral composition of vegetation and soils under strong exposure to endogenous factors. The aim of this work was to determine the peculiarities of the accumulation of 25 chemical elements by Potentilla anserina L. in the impact zone of Kuchiger hydrotherms (Barguzin Depression, the Buryat Republic, Russia). The concentrations of Ca, K, Mg, P, S, and Zn in P. anserina plants did not vary significantly in the surveyed territory. In the zone of subaquatic discharge of ascending deep thermal waters, plants accumulated more Na, Sr, Li (near the discharge of high-temperature gryphons) and W, Mo (near the discharge of low-temperature gryphons). The maximum concentrations of Al, Mn, Ti, Cr, Ni, Co, La, and Y in the plants were found on the coastal diapir shaft with extremely high ascent activity of gas-hydrothermal mud fluids. Concentration of several elements in plant ash exceeded the clarke values for plants: Ca ( K_с = 2.0-3.6), Na ( K_с = 2.4-4.8), Sr ( K_с = 3.5-9.5), Ba ( K_с = 2.7-6.6), Li ( K_с = 6.0-17.0), Sc ( K_с = 6.0-21.0). The intensity of biological absorption was characterized by the biological absorption factor (BAF) . The highest coefficients were found for P and S (BAF = 22.4-69.2). The elements of strong accumulation are Ca, Na, K, Mg, Mn, Sr, Zn, Cu, Li, Ni, Mo (BAF = 1.5-10.5); the rest elements were very weakly accumulated by plants (BAF = 0.1-0.9). The change in the intensity of element accumulation by plants under different conditions leads to a violation of the ratios between Fe/Mn, Fe/Zn, Cu/Mo, Ca/Sr, Ca/Ba, K/Ba, Sr/Ba.