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- Title
Natural concentrations and reference values of heavy metals in sedimentary soils in the Brazilian Amazon.
- Authors
do Nascimento, Clístenes Williams Araújo; Lima, Luiz Henrique Vieira; da Silva, Franklone Lima; Biondi, Caroline Miranda; Campos, Milton César Costa
- Abstract
The soils of the Brazilian Amazon exhibit large geochemical diversity reflecting the different soil formation processes in an area covering 49% of the Brazilian territory. Soil contamination by heavy metals is one of the threats to the sustainability of this Biome but establishing quality reference values (QRVs) for the region is a challenging owing to the immense territorial area of the Amazon. This study aimed to determine the natural background of heavy metals in soils from the southwestern Brazilian Amazon in order to propose QRVs for Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Sb, and Zn for alluvial sedimentary soils. One hundred and twenty-eight soil samples were collected at a depth of 0.0-0.2 m in sites with minimal anthropogenic interference. Soil sample digestion was based on the EPA 3051A method and metal concentrations were determined by ICP-OES. QRVs calculated for the southwestern Brazilian Amazon are among the lowest recorded in Brazil (mg kg−1): Ba (16.5), Cd (0.1), Cr (6.9), Cu (2.8), Fe (15.4), Mn (13.4), Ni (1.7), Pb (4.4), Sb (0.9), and Zn (5.7). The low metal concentration is likely a result of the sedimentary origin of the soils. The results of this study can serve as a basis for defining public policies to investigate the environmental impacts resulting from changes in land use in areas of the Brazilian Amazon.
- Subjects
METAL content of soils; HEAVY metals &; the environment; GEOCHEMISTRY; SOIL formation; SOIL pollution; SOIL quality
- Publication
Environmental Monitoring & Assessment, 2018, Vol 190, Issue 10, p1
- ISSN
0167-6369
- Publication type
Article
- DOI
10.1007/s10661-018-6989-4