Abstract
The role of both natural weathering and anthropogenic pollution in controlling the distribution of major oxides and several trace elements in soils, stream sediments, and rocks of the Fiume Grande catchment was evaluated. The contents of major oxides and trace elements in soils appear to be governed by weathering and pedogenetic processes, although the use of fertilizers in agriculture could also partly affect K2O and P2O5 contents. Stream sediments have concentrations of major oxides (except CaO) very similar to soils, as relevant amounts of soil materials are supplied to the stream channels by erosive phenomena. In contrast, stream sediments have concentrations of Cr, Co, Ni, Zn, As, and Pb significantly higher than those of soils, probably due to different conditions and rates of mobility of these elements within the three considered matrices and/or disposal of wastes in the drainage network. Comparison of the concentrations of PHEs in soils with the maximum admissible contents established by the Italian law shows that these limits are too restrictive in some cases and too permissive in other ones. The approach of setting these limits with no consideration for the local geological–geochemical framework may lead to improper management of the territory and its resources.
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Acknowledgments
This research was supported by Ph.D. fellowship and research funds from the University of Calabria. The authors wish to thank an anonymous reviewer for the competent and detailed review of the manuscript.
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Apollaro, C., Marini, L., De Rosa, R. et al. Geochemical features of rocks, stream sediments, and soils of the Fiume Grande Valley (Calabria, Italy). Environ Geol 52, 719–729 (2007). https://doi.org/10.1007/s00254-006-0508-6
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DOI: https://doi.org/10.1007/s00254-006-0508-6