Biological Systems: Theory and Innovation

Screening of natural (238U and 232Th-series, 40K) and technogenic (137Cs) radionuclides along with heavy metals in bottom sediments of rivers in Transcarpathia

Khrystyna Cherevko, Sergii Sukharev, Natalia Svatiuk
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Abstract

Bottom sediments are important indicators of a river’s condition, accumulating natural and industrial substances that reflect both background geochemical characteristics and anthropogenic impact. This study aimed to analyse the content of natural and technogenic radionuclides and heavy metals in Transcarpatian rivers to identify their distribution patterns and assess bioaccumulation within the «bottom sediments - ichthyofauna» system. Samples were collected in 2023-2024 from eight locations along the Uzh, Latorica, Borzhava and Tisza rivers. The specific activity of gamma-active nuclides in bottom sediments was determined using an ORTEC semiconductor γ-spectrometer. Heavy metal concentrations were determined using an ElvaX pro X-ray fluorescence analyser. The data obtained indicate the presence of local differences in radionuclide content levels. These differences are due to natural geochemical factors. The total specific activity of natural radionuclides (U- and Th-series) ranged from 340 to 534 Bq/kg. Maximum values of the sum of natural radionuclides were found within the settlements of Uzhhorod, Vylok and Chop areas. The highest activity of the natural radionuclide K-40 (522-533 Bq/kg) was recorded in areas with potassium-rich minerals and possible agricultural load. These areas include Pidpolozzia, Kolchyno and Chop. Technogenic Cs-137 was predominantly at low levels (2.9-7.0 Bq/kg), but a local increase was observed in fine-grained silt. Analysis of the degree of correlation between radionuclide content was expressed through the geochemical index Th/U. Fluctuations within the range of 0.63-1 revealed the mineralogical diversity of bottom sediments. Heavy metal content also varied - Zn 1.4-89.9 mg/kg, Pb 4.4-8.9 mg/kg, Cu 3.9-9.7 mg/kg, Ni 5.1-8.3 mg/kg and Cr 6.3-13.0 mg/kg. Maximum values were observed in urbanised areas (Uzhhorod, Chop), while minimum levels occurred in mountainous sites with minimal anthropogenic impact. Although concentrations did not exceed environmental standards, local maxima indicated potential pollution. The practical significance of this study value in using the results for ecological monitoring, predicting the migration of hazardous substances and assessing their bioaccumulation in aquatic food chains

Keywords

geochemical monitoring, background radiation, river sediments, toxic elements, river ecosystems

Suggested citation
Cherevko, K., Sukharev, S., & Svatiuk, N. (2025). Screening of natural (238U and 232Th-series, 40K) and technogenic (137Cs) radionuclides along with heavy metals in bottom sediments of rivers in Transcarpathia. Biological Systems: Theory and Innovation, 16(2), 61-74. https://doi.org/10.31548/biologiya/2.2025.61
References
  1. Abere, T., Evrard, O., Chalaux-Clergue, T., Adgo, E., Lemma, H., Verleyen, E., & Frankl, A. (2025). Fingerprinting sediment sources using fallout radionuclides demonstrates that subsoil provides the major source of sediment in sub-humid Ethiopia. Journal of Soils and Sediments, 25, 1008-1021. doi: 10.1007/s11368-025-03964-5.
  2. Akuo-ko, E.O., Shahrokhi, A., Adelikhah, M., Amponsem, E., Samolej, K., Csordás, A., & Kovács, T. (2025). Horizontal distribution of natural radionuclides and Cs-137 in sediment along Dixcove Beach. Journal of Marine Science and Engineering, 13(3), article number 452. doi: 10.3390/jmse13030452.
  3.  Baliuk, S.A., et al. (2023). Recommendations on the use of bottom sediments from fish farming ponds to improve the condition of agricultural lands and restore lands damaged as a result of hostilities. Kharkiv: DISA LLC. doi: 10.31073/issar9786178122799.
  4.  Brázová, T., Syrota, Y., Oros, M., & Uhrovič, D. (2025). Heavy metal accumulation in freshwater fish: The role of species, age, gender, and parasites. Bulletin of Environmental Contamination and Toxicology, 114, article number 92. doi: 10.1007/s00128-025-04068-z.
  5. Cabral-Lares, M., Rentería-Villalobos, M., Mendieta-Mendoza, A., Ortíz-Caballero, Z., Montero-Cabrera, E., & Vioque, I. (2022). Partitioning and availability of metals from water suspended sediments: Potential pollution risk assessment. Water, 14(6), article number 980. doi: 10.3390/w14060980.
  6. Cao, L., Zhang, Z., Zhao, J., Li, H., Li, J., & Wei, X. (2021). Discussion on the applicability of Th/U ratio for evaluating the paleoredox conditions of lacustrine basins. International Journal of Coal Geology, 248, article number 103868. doi: 10.1016/j.coal.2021.103868.
  7. Cimbolakova, I., Uher, I., Veszelits Laktičová, K., Vargová, M., Kimáková, T., & Papajová, I. (2020). Heavy metals and the environment. In I. Uher (Ed.), Environmental Factors Affecting Human Health. London: IntechOpen. doi: 10.5772/intechopen.86876.
  8.  DSTU ISO 5667-12-2001. (2002). Water quality – Sampling – Part 12: Guidelines for sampling of bottom sediments (ISO 5667-12:1995, IDT; DSTU ISO 5667-12-2001). Retrieved from https://zakon.isu.net.ua/sites/default/files/normdocs/dstu_iso_5667_12_2001_yakist_vody._vidbyrannya_prob._chastyna.pdf.
  9.  DSTU ISO 5667-15:2007. (2011). Water quality – Sampling – Part 15: Guidelines for the storage and handling of sludge and sediment samples (ISO 5667-15:1999, IDT; DSTU ISO 5667-15:2007). Retrieved from https://zakon.isu.net.ua/sites/default/files/normdocs/ba7f12239e5a49c09d14bb96715345b1.pdf.
  10.  Federico, R., Paolo, P., Katharina, K., Axel, M., & Adele, M. (2019). Soil biological indicators and caesium-137 to estimate soil erosion in areas with different forest system management. European Journal of Forest Research, 139, 67-81. doi: 10.1007/s10342-019-01230-1.
  11.  Geomap Land. (n.d.). Retrieved from https://geomap.land.kiev.ua/soil.html.
  12.  Gönczy, S., Fodor, G., Olah, N., Nagy, T., Ésik, Z., & Szepesi, J. (2020). Geoheritage values of the Northeastern Carpathians, Transcarpathia, Ukraine. Geoconservation Research, 3(2), 32-48. doi: 10.30486/gcr.2020.1904340.1026.
  13. Google Earth. (n.d.). Retrieved from https://surl.lt/uldrmn.
  14.  Heldal, H.E., Helvik, L., Haanes, H., Volynkin, A., Jensen, H., & Lepland, A. (2021). Distribution of natural and anthropogenic radionuclides in sediments from the Vefsnfjord, Norway. Marine Pollution Bulletin, 172, article number 112822. doi: 10.1016/j.marpolbul.2021.112822.
  15. Hrechaniuk, M., Holiaka, D., Levchuk, S., Pavlenko, P., Teien, H.-C., Haugen, T., Maksin, V., & Kashparov, V. (2023). Activity concentration of radionuclide and external dose rate in bottom deposits of Brit lake in the Chоrnobyl exclusion zone. Scientific Reports of the National University of Life and Environmental Sciences of Ukraine, 19(3). doi: 10.31548/dopovidi3(103).2023.001.
  16.  Hromyk, O., Ilyin, L., Grygus, I., Korotun, S., Ilyina, O., & Zukow, W. (2020). Radiation monitoring of agricultural soils of the Volyn region in Ukraine. Roczniki Państwowego Zakładu Higieny, 71(4), 377-382. doi: 10.32394/rpzh.2020.0139.
  17.  Jamil Emon, F., Rohani, M.F., Sumaiya, N., Tuj Jannat, M.F., Akter, Y., Shahjahan, M., Abdul Kari, Z., Tahiluddin, A.B., & Goh, K.W. (2023). Bioaccumulation and bioremediation of heavy metals in fishes – a review. Toxics, 11(6), article number 510. doi: 10.3390/toxics11060510.
  18.  Juranova, E., Hanslík, E., Dulanská, S., Grísa, T., Sedlářová, B., & Marešová, D. (2020). Sorption of anthropogenic radionuclides onto river sediments and suspended solids: Dependence on sediment composition. Journal of Radioanalytical and Nuclear Chemistry, 324(3), 983-991. doi: 10.1007/s10967-020-07174-w.
  19.  Khalef, R.N., Hassan, A.I., & Saleh, H.M. (2022). Heavy metal’s environmental impact. In H.M. Saleh & A.I. Hassan (Eds.), Environmental Impact and Remediation of Heavy Metals. London: IntechOpen. doi: 10.5772/intechopen.103907.
  20.  Khomenchuk, V., Vovchek, N., Byyak, V., Rabchenyuk, О., & Kurant, V. (2022). A comprehensive approach to the assessment of heavy metals pollution in ecosystems of small rivers in the Western Podilliya. Scientific Issue Ternopil Volodymyr Hnatiuk National Pedagogical University. Series: Biology, 81(4), 42-52. doi: 10.25128/2078-2357.21.4.7.  
  21.  McIntosh, J.A., Elliott, W.C., Wampler, J.M., & Tabor, N.J. (2023). Identifying detrital and diagenetic minerals in paleosols of the Illinois Basin. Clays and Clay Minerals, 71(6), 722-744. doi: 10.1007/s42860-023-00267-z.
  22.  Mitrović, B.M., Ostojić, D., Pantelić, G., Zorko, B., Stepišnik, M., Kožar Logar, J., & Ajtić, J. (2025). Natural and artificial radionuclides in the sediment, water, and fish samples from the Sava River in Serbia, Slovenia and Croatia: Comparing past and recent findings. Soil and Sediment Contamination: An International Journal, 1-19. doi: 10.1080/15320383.2025.2508729.
  23.  Mouri, G. (2020). Reproduction of sediment deposition and prediction of 137Cs concentration in the major urban rivers of Tokyo. Scientific Reports, 10, article number 9523. doi: 10.1038/s41598-020-65700-y.
  24.  Muneer, J., AlObaid, A., Ullah, R., Rehman, K.U., & Erinle, K.O. (2022). Appraisal of toxic metals in water, bottom sediments and fish of fresh water lake. Journal of King Saud University – Science, 34(1), article number 101685. doi: 10.1016/j.jksus.2021.101685.
  25.  Osae, R., Nukpezah, D., Darko, D. A., & Mensah, A. (2023). Heavy metal mobility, bioavailability, and potential toxicity in sediments of the Korle lagoon in Ghana. International Journal of Environmental Studies, 80(6), 1556-1572. https://doi.org/10.1080/00207233.2022.2042971
  26.  Patel, K.S., Sharma, S., Maity, J.P., Martin-Ramos, P., Fiket, Z., Bhattacharya, P., & Zhu, Y. (2023). Occurrence of uranium, thorium and rare earth elements in the environment: A review. Frontiers in Environmental Science, 10, article number 1058053. doi: 10.3389/fenvs.2022.1058053.
  27.  Reinoso Carbonell, V.V., Collo, G., Wunderlin, C.A., Alasino, P.H., Ciccioli, P.L., Rocher, S., & Maza, S. (2022). Clay mineral assemblages as indicators of paleoenvironmental and diagenetic dynamics in the Neogene Fiambalá Basin, NW Argentina. Journal of South American Earth Sciences, 118, article number 103949. doi: 10.1016/j.jsames.2022.103949
  28.  Shahjahan, M., Taslima, K., Rahman, M. S., Al-Emran, M., Alam, S. I., & Faggio, C. (2022). Effects of heavy metals on fish physiology – A review. Chemosphere, 300, article number 134519. doi: 10.1016/j.chemosphere.2022.134519.  
  29.  Sojka, M., & Jaskuła, J. (2022). Heavy metals in river sediments: Contamination, toxicity, and source identification – a case study from Poland. International Journal of Environmental Research and Public Health, 19(17), article number 10502. doi: 10.3390/ijerph191710502.
  30.  Svatiuk, N.I., Symkanych, О.І., Pop, O.M., & Roman, V.I. (2022). Radioecological monitoring of the water-soil environment of the Tisza river basin: Educational and methodological recommendations. Uzhhorod: Institute of Electronic Physics of the National Academy of Sciences of Ukraine.
  31.  Symkanych, О.І., Коkhan, О.P., Glukh, О.S., Krch, K.L., Lytvyn, О.V., Svatiuk, N.І., & Butsyak, І.V. (2024). Monitoring of radionuclide migration in the bottom sediments of the Tysa Bila riverʼ sourse. Scientific Bulletin of the Uzhhorod University Series “Chemistry”, 50, 75-82. doi: 10.24144/2414-0260.2023.2.75-82.
  32.  Taslima, K., Al-Emran, M., Rahman, M. S., Hasan, J., Ferdous, Z., Rohani, M. F., & Shahjahan, M. (2022). Impacts of heavy metals on early development, growth and reproduction of fish – a review. Toxicology Reports, 9, 858-868. doi: 10.1016/j.toxrep.2022.04.013.
  33.  Zou, Y., et al. (2025). Mechanisms of uranium and thorium Accumulation in the Lower Ediacaran Marine Sediments from the Upper Yangtze Platform, China: Implications for helium exploration. Journal of Marine Science and Engineering, 13(3), article number 413. doi: 10.3390/jmse13030413.