Natural concentrations and reference values of heavy metals in sedimentary soils in the Brazilian Amazon

被引：0
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作者：
Clístenes Williams Araújo do Nascimento
Luiz Henrique Vieira Lima
Franklone Lima da Silva
Caroline Miranda Biondi
Milton César Costa Campos
机构：
[1] Universidade Federal Rural de Pernambuco,Programa de Pós
[2] Universidade Federal Rural de Pernambuco,graduação em Ciência do Solo
[3] Universidade Federal do Amazonas,Departamento de Agronomia
来源：
Environmental Monitoring and Assessment | 2018年 / 190卷
关键词：
Amazon soils; Soil contamination; Trace elements; Soil quality;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
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