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Potentially toxic elements in surface soils of the Lower Don floodplain and the Taganrog Bay coast: sources, spatial distribution and pollution assessment

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Abstract

The pollution of floodplain, deltaic and adjacent coastal soils in large fluvial systems, considered an urgent environmental problem, as well as potentially toxic elements in such environments, can negatively affect aquatic ecosystems, as well as pose significant risks to human health. This paper is devoted to the geochemistry of potentially toxic elements in soils of the Lower Don basin, which is one of the largest and most anthropogenically transformed water bodies in Southern Russia, as well as the adjacent areas of the Taganrog Bay coast. The median element concentrations in the soils of the study area were consistent with the world soil average and the contents of elements in background soils. Comparative assessment of the spatial distributions as well as the results of Pearson’s correlations, cluster analysis and principal component analysis showed that Cr, Ni, Cu and Zn are predominantly of natural origin; Mn and As are of mixed sources; and Cd and Pb are predominantly of anthropogenic origin. The geochemical anomalies of elements were associated with the impact of local anthropogenic sources. Geochemical background values for Cr, Mn, Ni, Cu, Zn, As, Cd and Pb in the soils of the Lower Don and the Taganrog Bay coast determined using the ‘median + 2 median absolute deviations’ approach are presented. The highest values of the integrated pollution indices were observed in floodplain soils of small rivers.

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The authors confirm that the summary of data supporting the findings of this study are available within the article. However, detailed data of this study are available from corresponding author upon request.

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Funding

The reported study was funded by Russian Science Foundation, Project No. 20–14-00317.

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TM: supervised the whole research, EK: composed the main chapters of the manuscript, DN, MV, IZ: performed the detailed field study and soil sampling, SM, TB, SS: performed the analytical works, EK, DN, SM, AM, SS: performed statistical evaluation, contributed with several paragraphs in chapters Results and Discussion, prepared the formal shape of the manuscript.

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Correspondence to Elizaveta Konstantinova.

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Konstantinova, E., Minkina, T., Nevidomskaya, D. et al. Potentially toxic elements in surface soils of the Lower Don floodplain and the Taganrog Bay coast: sources, spatial distribution and pollution assessment. Environ Geochem Health 45, 101–119 (2023). https://doi.org/10.1007/s10653-021-01019-5

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