Abstract
It was established that the water does not meet the upper limit of the 1st quality class according to DSTU 4808:2007 by all indicators except for chloride ions, SPAR and suspended substances. There is a decrease in the level of BSK5 at the monitoring post in the lower part of the reservoir, which indicates the entry of substances into the watercourse that inhibit biochemical processes. There is also an increasing trend in the content of sulfates, phosphates, nitrogen compounds and HSC in water for control points located within the influence of industrial cities, along the reservoir. The highest values of the entropy index of water quality are characteristic of points p2, p. Adamivka, Chygyryn district (0.59015) and p3, village. Pronozivka Globyn district, (0.63092). These control points are located at a considerable distance from industrial centers, so pollution caused by agricultural production (application of phosphate and nitrogen fertilizers) probably plays a decisive role in the formation of water quality. The smallest value of the index (0.39397) is characteristic of item p1 – c. Sokirne, drinking water intake in the city of Cherkasy. The value of the non-torsion water quality index is in the range from 0.39397 (point p1) to 0.63092 (point p3).
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