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Scientific journal
Название журнала на английском
ISSN 2500-0802
ПИ №ФС77-61154
ISSN 2500-0802
ПИ №ФС77-61154
SALT COMPOSITION VALUES IN SMALL WATERBODIES IN THE SOUTHOF AMURSKAYA OBLAST
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The data on the salt composition of technogenic lakes, water reservoirs, oxbow and kettle lakes were analyzed. It was shown that the salt composition changes noticeably with the season. Water column is stratified by the water temperature and chemical composition; the chemical heterogeneity is decreased in autumn due to water mass overturning. The waters in all studied waterbodies are calcium- or sodium-hydrocarbonate waters with low mineral content. The content of minerals may change with the season. On the general salt background formed by major ions, the main input to the water quality comes from biogenic elements: ecological status of the waterbody depends on their content, which is low in autumn, increased in summer, and reaches maximal concentrations of silicates, iron and ammonia during the ice-on period. The highest content of biogenic elements is observed in near-bottom layer as a result of their escaping from sediments under conditions of oxygen deficiency.Seasonal fluctuations of pH were observed, with the highest meanings in summer period. As a rule, pH is the highest in surface layer, gradually decreasing to the bottom. Zinc and lead were found in small concentrations in all studied waterbodies. Cadmium was found in traces, and copper was registered in a few samples.All studied waterbodies are typical for the south of Amurskaya Oblast, reflecting the hydrochemical character of the regional surface waters.