Authors
Sergii Sukharev, Khrystyna Cherevko, Ruslan Mariychuk, Oksana Sukhareva, Stepan Milyovich, Andriy Motsa, Olesya Symkanych
Published in
Bulletin of environmental contamination and toxicology. Volume 117. Issue 5. Oct 25, 2026. Epub Oct 25, 2026.
Abstract
The rivers of the Tisza basin have complex geology, tectonics, and morphology and traverse different landscape zones, from mountainous areas to lowlands. This affects the composition and properties of the water of the Tisza River, which, in turn, influence the state of the Danube River. Bioaccumulation of heavy metals (HM) and radionuclides (RN) by indigenous ichthyofauna can serve as an indicator of the ecological status of rivers. This study presents the identified patterns in the bioaccumulation of selected HM (Cd, Pb, Zn, and Cu) and natural gamma-active RN (the 238U and 232Th series) by a representative of the indigenous ichthyofauna, Squalius cephalus L., in the upper reaches of rivers of the Tisza basin. There is a general trend towards increasing HM content in Squalius cephalus L. samples along the riverbed across sections extending from mountainous to foothill landscape zones. This trend is associated with changes in the geology, tectonics and morphology of the river basin. An increase in the Zn/Cu ratio (from 10.6 to 19.2) in fish samples along the riverbed from mountainous to foothill landscapes was observed. The total specific activity of RN in Squalius cephalus L. samples ranges from 34.2 to 88.8 Bq⋅kg-1 and tends to decrease from mountainous to lowland landscapes. The ∑232Th/∑238U ratio ranges from 0.86 to 1.42. In mountainous landscapes, RNs in the 238U series make a significant contribution to the total specific radioactivity.
PMID:
42927498
Bibliographic data and abstract were imported from PubMed on 26 Oct 2026.
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