Abstract
The goal of this work is to analyze the long-term dynamics of the content of nitrites, nitrates, sulfates, chlorides and phosphates in the transboundary river Seversky Donets. Material and methods. Regular sampling at three points over 10 years (from 2007 to 2016) was used for this research. Monthly average ions concentration in MPC fractions was analysed. Results. Regularities in the dynamics of the anionic composition, caused by both natural and anthropogenic factors, are revealed. It was discovered that the main sources of phosphates and nitrites are located in the Belgorod region, while sulfate and chloride pollution happens mainly on the territory of Ukraine as a result of the discharge of mine waters by coal industry enterprises. The nitrates concentration has similar quantitative values and dynamics at all considered sampling points, which is determined by the natural mechanisms of nitrogen transformation in warm and cold periods. Also, the comparison of specific combinatorial indices of water pollution (SCIWP) at the considered sampling points for the considered period is carried out. Conclusion. In order to improve the ecological situation, it is recommended to conduct regular sampling and observation, including at a larger number of sampling points, as well as data exchange with the Ukranian environmental services.
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