Author(s)

V. Osadchy, N. Osadcha & Ju. Nabyvanets

Abstract

Surnnlarizing or last decade data concerning Ukraine's surfice waters chemical conlposition have been carried out. Changes of niincralization. pH. mineral forms of phosphorus and nitrogen, heavy metals and humic substances in water of main river basins were shou.11. It was fo~uid, that in basins of Zapadny B L I ~ . Dnieper, Danube and Seversky Donets the tendency of pH increase is being observed for the long time. It also shouid be mentioned that almost for all studied river basins of Ukraine decreasing of phosphorus mineral forms concentrations were identified. That finding allows concluding about obvious discontinuance of global process of surface water eulrophication by phosphorus cornpounds. Also the comparati1;e analysis of data sets obtained in early 60-s and for period of 1995-2000 indicated the tendency olN,,,,,, and NIL' decreasing almost in 2 times. Relatively high concentrations of dissolved organic matter would be considered as a positive factor of water selfpurification from toxic f

Keywords