ABCTRACT.
Heavy metals such as copper, lead, cadmium, mercury and others can accumulate in the tissues of
fish and other aquatic organisms, increasing the risk of bioaccumulation and biomagnification in the organs and tissues
of terrestrial and aquatic species, creating a high degree of hazard and toxicity. This work analyzes the results of the
content of heavy metals in the water column, bottom sediments and the accumulation of these metals in the liver of amphibians. The studied samples were taken at three points: near the settlements of Aksu, Pugachevo and Araltal and at
the confluence of the Karaoba River. At all three points, excesses of the maximum permissible concentration of cadmium in the water column were found, but the highest concentration was at a point near the village of Aksu - 0.0033
mg/kg. At the same time, it was found that the highest concentrations of cadmium were found in Pelophylax ridibundus
individuals from this site. A study of metal accumulation showed that despite the high concentration of zinc in water
and bottom sediments, copper exhibits the greatest ability to accumulate in the body.
KEYWORDS: heavy metals, sediments, Ural river, bioaccumulation, liver, Pelophylax ridibundus.