Abstract
Heavy metals occur naturally in soil, at concentrations that depend on the parent material from which the soil was formed, the processes of formation, and the composition and the proportion of the components of its solid phase. Quantifying these concentrations is important for environmental studies of soil contamination and pollution, and choosing the methods for doing so is a key step in establishing heavy metal contents in soil samples. We evaluated two digestion methods (aqua regia and EPA 3051, both microwave oven-assisted) for assessing pseudo-total concentrations of Cd, Co, Cr, Cu, Ni, Pb and Zn in the surface layer (0–20 cm) of soil samples from the Brazilian agricultural frontier in the southwestern Amazon. Nineteen composite samples of the most representative soil classes for the states of Mato Grosso and Rondônia were collected under native vegetation undisturbed by human intervention. Canonical discriminant analysis and principal component analysis were used for multivariate exploration of the data. Aqua regia extracted higher amounts of Co, Ni, Pb, and Zn than EPA 3051, while levels of Cr and Cu did not differ between methods. In general, aqua regia recovered more of the metals when compared to reference soil samples.
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Acknowledgments
To Brazil’s National Council for Scientific and Technological Development (CNPq) 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. 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. Methods for Extracting Heavy Metals in Soils from the Southwestern Amazon, Brazil. Water Air Soil Pollut 224, 1430 (2013). https://doi.org/10.1007/s11270-012-1430-z
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DOI: https://doi.org/10.1007/s11270-012-1430-z