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Lead adsorption in the clay fraction of two soil profiles from Fildes Peninsula, King George Island

Published online by Cambridge University Press:  30 November 2012

Thiago Mendonça
Affiliation:
Departamento de Solos e Engenharia Agrícola, Universidade Federal do Paraná, Rua dos Funcionários 1540, Juvevê, 80.035-070, Curitiba, Paraná, Brazil
Vander F. Melo*
Affiliation:
Departamento de Solos e Engenharia Agrícola, Universidade Federal do Paraná, Rua dos Funcionários 1540, Juvevê, 80.035-070, Curitiba, Paraná, Brazil
Luís R.F. Alleoni
Affiliation:
Departamento de Ciência do Solo - Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Av. Pádua Dias 11, Agronomia, 13.418-900, Piracicaba, São Paulo, Brazil
Carlos E.G.R. Schaefer
Affiliation:
Departamento de Solos, Universidade Federal de Viçosa, Av. PH Rolfs s/n, 36.570-000, Viçosa, Minas Gerais, Brazil
Roberto F.M. Michel
Affiliation:
FEAM - Rodovia Prefeito Américo Gianetti, s/n Bairro Serra Verde, 31.630-900, Belo Horizonte, Minas Gerais, Brazil
*
*corresponding author: [email protected]

Abstract

Antarctica is considered the most isolated continent, but it is not free of pollution, which arrives at specific localities mainly as a result of tourism and research activities. Among environmentally harmful substances, heavy metals are especially important because of their high toxicity to organisms. The aim of this study was to estimate the maximum adsorption of lead (Pb) onto the clay fraction of samples from two soil profiles from the Fildes Peninsula, King George Island, South Shetland Islands. Experimental data were fitted to the Langmuir isotherm, and the adsorption parameters were correlated to mineralogical attributes of this soil fraction characterized by chemical extractions and X-ray diffraction. Values of maximum adsorption of Pb in the clay fraction were extremely high (maximum value: 322 581 mg kg-1) when compared to those of soil samples from other regions of the world. Adsorption occurred in two stages: first stage in which a high percentage of Pb was adsorbed, and second stage in which adsorption was lower. From an environmental point of view, soils with high contents of clay and amorphous minerals, ones usually associated with ornithogenic activity in Antarctica, should have greater efficiency in filtering Pb, thus reducing risks of leaching and groundwater contamination.

Type
Earth Sciences
Copyright
Copyright © Antarctic Science Ltd 2012 

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