Hydrochemical State of the Waters of the Salgir and Biyuk-Karasu Rivers (Crimean Peninsula) in Summer 2023

N. P. Kovrigina*, D. S. Borisova, S. V. Ovechko, V. I. Ryabushko

A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Sevastopol, Russia

* e-mail: npkovrigina@yandex.ru

Abstract

The paper studies hydrochemical characteristics of waters of the Salgir and Biyuk-Karasu Rivers in summer, when the anthropogenic load is increased. Data were obtained on dissolved oxygen concentration, five-day biochemical oxygen demand (BOD5), alkaline permanganate oxidizability, concentrations of silicate, mineral and organic forms of nitrogen and phosphorus. The samples were collected in July, August and September 2023 in Simferopol and in the Krasnogvardeisk, Nizhnegorsk and Belogorsk regions in the Republic of Crimea. The analyses were performed according to the generally accepted methods. Compliance of the obtained results on hydrochemical indicators with water quality regulations was assessed. A high level of oxygen content was noted at all stations. BOD5 values varied from 0.98 to 3.34 mg/L (the village of Molochnoye) and exceeded the limit for fisheries by up to 1.6 times. The oxidizability values exceeded the maximum allowable value by 2 to 4 times. The concentrations of the mineral forms of nitrogen did not exceed maximum allowable concentrations, except for nitrite concentration (maximum exceedance by 2.8 times). The phosphate concentration exceeded the maximum permissible concentrations near the villages of Novogrigoryevka and Molochnoye (maximum by up to 5.6). The study results allow determining the areas of Molochnoye and Novogrigoryevka as most polluted.

Keywords

hydrochemical characteristics, nutrients, anthropogenic load, water quality, Salgir river, Crimea

Acknowledgments

The work was supported within the governmental research assignment of Research Center for Freshwater and Saltwater Hydrobiology no. 102320600002-2-1.6.17 “Study of features of the structure and dynamics in freshwater ecosystems of the Northern Black Sea region” and partially within the governmental research assignment of IBSS of RAS 1023032700554-2-1.6.16 (FNNZ-2024-0032) “Integrated study of mechanisms of functioning of marine biotechnological complexes for the purpose of obtaining biologically active substances from hydrobionts”.

For citation

Kovrigina, N.P., Borisova, D.S., Ovechko, S.V. and Ryabushko, V.I., 2024. Hydrochemical State of the Waters of the Salgir and Biyuk-Karasu Rivers (Crimean Peninsula) in Summer 2023. Ecological Safety of Coastal and Shelf Zones of Sea, (3), pp. 139–148.

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