Hydrochemical characteristics of the Upper reaches of the Tisza River


 The purpose of this study is to analyse the hydrochemical regime and surface water quality upper reaches Tisza River from its source Tiachiv, which also includes transboundary section river. data Borys Sreznevskyi Central Geophysical Observatory State Emergency Service Ukraine for period 1984-2018, as well results route surveys during 2015-2018 served materials study. hydrological parameters river, in particular level flow water, distribution change power sources throughout year were analysed. Based on collected materials, a detailed analysis indicators Tisza, Black White rivers was carried out. During research, natural conditions territory economic activity studied their influence values physic-chemical indicators, main ions mineralization biogenic substances, heavy metals specific pollutants ratio seasonal, average annual, multi-year maximum permissible concentra-tions (MPC) hydro-chemical considered determine seasonal variability dynamics. role factors formation chemical composition river waters determined, anthropogenic are indicated. Seasonal indicated groups analysed considering different phases content. It determined that headwaters calcium carbonate, moderately fresh with (192-245 mg∙dm-3) clear variability. Cases increased concentrations nitrogen-containing compounds due intensive decomposition organic substances house- hold wastewater revealed. High iron recorded, related peculiarities geological structure territory. content synthetic surfactants established. A decrease observed.