UDC 504.03 + 620.9 • Issue 3(31)/2020 • 100 – 111 pages •
Geohìm. tehnog. (2020) 3 (30) :100-111
Shkapenko V.V., Buzhuk L.O., Zoludenko O.O., Litvinenko U.V., Fomina T.V., Vashchenko N.M., Zelak O.D.
According to the results of four-year monitoring studies of the Southern Buh River above and below the Alexander Reservoir, the threshold values have been substantiated for 19 hydrochemical indices of water quality. They will be a basis for further detailed monitoring in line with the implementation of the EU Water Framework Directive. The Groundwater Directive (2016) particularly emphasises on identifying and correcting sustainable trends in pollution. Another item that is covered is detection and correction. The general recommendation is to use 75% of quarters from the analyzed contents (or from approved standards) as the threshold for deterioration of water quality, obviously, considering the peculiarities of the distribution of values, this is the default standard in the world. This recommended threshold may be adapted to the local circumstances, justifying different percentages. The methodological approach to setting thresholds and reference values is to consider in detail the parameters of the parameter distributions and to determine the threshold values for the part of the Southern Buh that is directly influenced by the waters of the Tashlyk hydroelectric power station and the Alexander reservoir. These data will become the basis for clarifying the classification of waters according to EU recommendations. Our research demonstrated low informativeness of mean values of the indicators and the necessity to take into account the distribution of values to determine the threshold concentrations. The found ranges of the reference values can be used in studies of the validity of certain classifications of the surface water purity. Significant contamination of the studied area of the Southern Buh River with nitrates and phosphates was confirmed. The insignificant effect of the Tashlyk hydroelectric power station on the total dissolved solids content in the Southern Buh River water and the ability of the Alexander reservoir to self-purify have been demonstrated.
Key words: EU Water Framework Directive, hydrochemical parameters, thresholds, reference values, water monitoring, water body.
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