The main conceptual approaches of water quality assessment and existing methods of standardization and
classification of water on various parameters were summarized. Comparative analysis of sanitary and environmental
principles of standardization has been fulfilled; the advantages and disadvantages of these approaches were discussed.
It was concluded that the most reliable information about the state of the aquatic ecosystem can be obtained by using
a physical, chemical and biological parameter complex. The international experience of water quality assessment was
analyzed and the priority actions to implement the requirements of the Water Framework Directive in Ukraine were
proposed.
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