RESULTS OF HYDROCHEMICAL RESEARCH OF THE BLACK SEA BASIN RIVERS

The Black Sea is one of the largest inland continental seas. It can be posed an ecological problem by the rivers that flow into it. Rivers can pollute with large amounts of biogenic substances and various organic pollutants. Therefore, the study of the ecological status of rivers is crucial (Mchedluri., T. 2020) The aim of our research was to determine the ecological status of the sediments of the rivers of the Black Sea basin of Georgia, Natanebi and Choloki. For this purpose, studies were conducted in the summer of 2020 and its hydrochemical parameters were evaluated. Physico-chemical parameters of water (pH, electrical conductivity, temperature, dissolved oxygen in the water, odor, and turbidity) were determined in the analytical samples. Some heavy metals (Cu, Fe, Zn, Al, Ni, Cr, Mn, As), basic ions (HCO3 – , Cl– , Ca2+ , Mg2 +, Na + , K + , SO4 2– ). Samples were taken, packaged and transported in accordance with ISO and EPA standards. Based on the results of the study, we can conclude that the basic ions in water do not exceed the maximum permissible concentrations. The content of heavy metals in the floating sediments of the river Natanebi is significantly increased compared to the bottom sediments. Presumably, these elements are accumulated in the terrigenous material generated by the washing of the soil surface. The hydro-chemical characteristics of the Natanebi River and the Choloki River are close to each other. In the downstream of the Natanebi River, all the studied features are practically within the background and no obvious ecological problems occur. As for the river Cholokhi, it is possible to show signs of eutrophication in it, which will be caused by natural conditions, due to the gentle flow of the parallel riverbed. At present, the anthropogenic pollution of rivers does not reach dangerous levels and their ecological condition is satisfactor