Abstract
Guideline values are used to identify polluted or contaminated areas based on background values. Brazilian law establishes three guideline values for pollutants: a quality reference value (QRV), a prevention value, and an intervention value. Reference values refer to the natural concentration of an element or a substance in soils that have not been modified by anthropogenic impacts. These values inform assessments of soil quality and are used to establish maximum permissible limits. The objective of this study was to determine the natural levels and reference values for Cd, Co, Cr, Cu, Ni, Pb, and Zn in samples from the surface layer (0–20 cm) of 19 representative soils of the states of Mato Grosso and Rondônia, on Brazil’s agricultural frontier. Pseudo-total metal concentrations were obtained following microwave-assisted digestion using the aqua regia and EPA3051 methods. QRVs were calculated for each element as the 75th and 90th percentiles of the frequency distribution of the data. Natural levels of heavy metals in the soil samples followed the order: Cr > Zn > Cu > Co > Pb > Ni > and Cd (aqua regia) and Cr > Co > Cu > Pb > Zn > Ni > Cd (EPA3051). These values are generally lower than those reported in the Brazilian and international literature, which highlights the importance of establishing reference values for each state or for each soil type, taking into account the geomorphological, pedological, and geological diversity of the region under study.
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Acknowledgments
The authors are grateful to Brazil’s National Council for Scientific and Technological Development, for granting a master’s degree scholarship to the first author and a Research Productivity grant to the second author and for financial support of the project. The authors are also grateful to Prof. Carlos Clemente Cerri of the Center for Nuclear Energy in Agriculture of the University of São Paulo, who kindly provided soil samples.
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dos Santos, S.N., Alleoni, L.R.F. Reference values for heavy metals in soils of the Brazilian agricultural frontier in Southwestern Amazônia. Environ Monit Assess 185, 5737–5748 (2013). https://doi.org/10.1007/s10661-012-2980-7
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DOI: https://doi.org/10.1007/s10661-012-2980-7