Available contents of potentially toxic elements in soils from the Eastern Amazon |
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| Institution: | 1. Research and Analysis Platform for Environmental Sciences (PRASE), Doctoral School of Sciences and Technology (EDST), The Lebanese University, P.O. 5, Rafic Hariri Campus, Hadat, Lebanon;2. Department of Chemistry, Umeå University, SE-901 87, Umeå, Sweden;3. Department of Earth and Life Sciences, Faculty of Sciences, The Lebanese University, Rafic Hariri Campus, Hadat, Lebanon;4. Laboratory of Georesources, Geosciences and Environment (L2GE), Faculty of Sciences, The Lebanese University, Fanar, Lebanon |
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| Abstract: | Background Values of potentially toxic elements (PTEs) in soils are typically obtained from total or pseudo-total contents, but not represent the fraction of these elements available for plant uptake due to the predominance of the stable forms. Available contents to plants, in turn, tend to be positively correlated with the potential risk of contamination of PTEs. In this study, we determined the available contents, extracted with Mehlich-III solution, of Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn in Oxisols and Ultisols in the state of Pará, Eastern Amazon, Brazil. Available contents ranged from low to very low when compared to soils from other Brazilian regions and from other countries. Contents of PTE were higher in Oxisols than in Ultisols, except for Cu and Ni. In the Oxisols, PTEs were positively correlated with clay content. However, PTEs were not correlated with soil pH, organic matter and cation exchange capacity. In the Ultisols, Ba, Cu, Pb, and Mn contents were significantly correlated with pH, while Ni contents were correlated with the contents of silt. |
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| Keywords: | Background values Availability of heavy metals Soil attributes Guideline values |
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