Hydrochemical state of the Chikoy River and its tributaries in the territory of the Chikoy National Park

Institute of Natural Resources, Ecology and Cryology of the Siberian Branch of the Russian Academy of Sciences (INREC SB RAS), Nedorezova Street, 16a, 672014, Chita, Russia

^* Corresponding author: 44mary44@mail.ru

Abstract

The paper presents data on the physical and chemical state of the waters of the Chikoy River and some of its tributaries during the spring and summer in 2017. The results of studies of the physical and chemical characteristics of waters are analyzed: temperature, turbidity, hydrogen index, mineralization, biogenic substances (nitrogen and phosphorus), macrocomponent composition and organic matter. It was revealed that the water temperature in watercourses varied from 1.2 to 16.4 °C, the turbidity of river water varies from 35 to 55 g/m3, the oxygen content corresponds to 8.2-9.24 mg/L, the hydrogen index ranges from 6.26 to 7.34. It was noted that in the spring in the studied watercourses, Еh varied from 144 to 203 mV, and in the summer – from 287.8 to 387.2 mV, which indicates the possible presence of a number of elements in the water in the higher form of their ionic valency (Fe3+, Mo6+, Sr4+, Cu2+ , Pb2+, etc.). The salinity values (TDS) of water ranged from 23.23 mg/L to 70.31 mg/L. According to the macrocomponent composition the water of the Chikoy River and its tributaries belong to the bicarbonate class of the calcium group. The Si content varies from 2.75 to 4.27 mgSi/L. The predominant form of inorganic nitrogen for the rivers under study is its nitrate form (0.07-0.27 mg/L). Phosphates varied from 0 to 0.009 mg/L, total phosphorus – from to 0.015 mg/L. Organic substances of allochthonous origin. In general, the waters of the Chikoy River and its tributaries are ultra-fresh waters, typical of mountain taiga ecosystems.