Hydrochemical indicators dynamics of the lakes of Volzhsko-Kamsky State Nature Biosphere Reserve

Abstract

© Published under licence by IOP Publishing Ltd. The article discusses the results of long-term monitoring of the hydrochemical state of different types of lakes in the Raifa part of the Volzhsko-Kamsky State Nature Biosphere Reserve (Republic of Tatarstan). The comparative characteristics of the chemical composition and water quality of flowing and drainless lakes are given, and the multiplicities of exceeding the maximum permissible concentrations of pollutants in the summer period of 2016-2020 are revealed. It is noted that flowing lakes with a swampy catchment area in the Ser-Bulak river valley are most susceptible to biogenic load. High concentrations of heavy metals are associated with the accumulation of organic substances in these reservoirs.