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Predictive modeling for U and Th concentrations in mineral and thermal waters, Serbia

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The objective of this paper was to determine background values (BV) and anomalous values (AV) of U and Th in groundwater and to establish hydrogeochemical conditions which lead to the elevated concentrations of these elements in groundwater. The methodology included planning and collecting of water samples, laboratory work, and assessment of BV and AV concentrations in accordance with the dataset distribution, based on consideration of hydrogeochemical conditions in the hydrogeological system. Groundwater sampling included 144 occurrences of mineral and thermal water from Serbian territory, belonging to different hydrogeological systems. Field parameters were measured for temperature (T), pH, electrical conductivity (EC), oxidation–reduction potential (ORP), dissolved oxygen (DO), and carbon dioxide (CO2). Standard laboratory measurements were applied for the determination of major chemical components (Ca, Mg, Na, K, Cl, HCO3, and SO4) and U and Th concentrations were measured by ICP-MS. The first step for obtaining U and Th threshold values was based on non-parametric statistical analysis on the data sets. Further analysis of threshold values enabled establishing hydrogeochemical conditions influencing elevated concentrations of U and Th and setting up the logistic regression (LR) model. Differences in the hydrochemical properties of U and Th can be observed based on predictor variables from LR models. Physico-chemical parameters Eh and pH, groundwater type, and geochemical environment (cretaceous igneous rocks) were significant predictors for elevated uranium concentrations, while significant predictors in the thorium LR model were the pH value, the concentration of SO4 in the solution, and the water-bearing rocks (tertiary igneous rocks).

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Acknowledgements

This work is supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, within the Project III 43004. The authors would like to thank Vladica Cvetković for reading one of the earlier versions of the manuscript and for useful suggestions to improve the manuscript. Also, the authors owe great gratitude to unknown reviewers who have shown a keen interest in improving this work.

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  1. University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia

    Marina Ćuk Đurović, Igor Jemcov, Maja Todorović, Ana Mladenović, Petar Papić & Jana Štrbački

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  1. Marina Ćuk Đurović
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Correspondence to Marina Ćuk Đurović or Ana Mladenović.

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This article is a part of the Topical Collection in Environmental Earth Sciences on “Mineral and Thermal Waters" guest edited by Drs. Adam Porowski, Nina Rman and Istvan Forizs, with James LaMoreaux as the Editor-in-Chief.

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Ćuk Đurović, M., Jemcov, I., Todorović, M. et al. Predictive modeling for U and Th concentrations in mineral and thermal waters, Serbia. Environ Earth Sci 79, 456 (2020). https://doi.org/10.1007/s12665-020-09204-y

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