Abstract
Background. The Irtysh is a large transboundary river flowing through the territory of three countries: China, Kazakhstan, and Russia. This river is crucial for the economic activity of the population of all these countries and is subjected to heavy anthropogenic pressure, including pollution by industrial wastewater and runoff from watersheds. Relevance. Monitoring of the Irtysh River water quality is an essential task, which importance is driven by the need for the assessment of its environmental status in the context of increased anthropogenic impact and global warming, as well as by the necessity for identification of common patterns in the changes of the water chemical composition of transboundary rivers. The aim of this research is to study the seasonal dynamics of the chemical composition of the Irtysh River water within the territory of the Omsk Region. Methods. This work is based on the data obtained through hydrochemical analysis using the conventional methods; the samples were collected along the entire stretch of the Irtysh River within the Omsk Region from May to October 2023. Results. Exceedance of the average monthly values of maximum permissible concentrations (hereinafter referred to as MPCs) for the water bodies used for fisheries has been identified for several parameters: up to 1.5 times for suspended solids, up to 1.4 times for BOD , and up to 5.0 times for PO43- (based on P). The average monthly concentrations of ammonium nitrogen, petroleum products and phenols did not exceed the prescribed values. Conclusion. The content of easily oxidizable organic matter (based on BOD5) and biogenic elements in the water of the Irtysh River within the Omsk Region has a pronounced seasonal variation; the highest values have been observed in spring and autumn, and the lowest values have been recorded during the summer low water period.
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