Geochemistry and spatial variability of metal(loid) concentrations in soils of the state of Minas Gerais, Brazil.

Autor: de Souza JJ; Departamento de Solos, Universidade Federal de Viçosa, AV. Prof. Peter Henry Rolfs, s/n, Viçosa, MG 36570-000, Brazil. Electronic address: jjlelis@gmail.com., Abrahão WA; Departamento de Solos, Universidade Federal de Viçosa, AV. Prof. Peter Henry Rolfs, s/n, Viçosa, MG 36570-000, Brazil. Electronic address: wabrahao@ufv.br., de Mello JW; Departamento de Solos, Universidade Federal de Viçosa, AV. Prof. Peter Henry Rolfs, s/n, Viçosa, MG 36570-000, Brazil. Electronic address: jwvmello@ufv.br., da Silva J; EMBRAPA Hortaliças, Rod. BR 060, km 09, Brasília/Anápolis, Brasília, DF 70359-970, Brazil. Electronic address: juscimar.silva@embrapa.br., da Costa LM; Departamento de Solos, Universidade Federal de Viçosa, AV. Prof. Peter Henry Rolfs, s/n, Viçosa, MG 36570-000, Brazil. Electronic address: liovando.costa@ufv.br., de Oliveira TS; Departamento de Solos, Universidade Federal de Viçosa, AV. Prof. Peter Henry Rolfs, s/n, Viçosa, MG 36570-000, Brazil. Electronic address: teo@ufv.br.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2015 Feb 01; Vol. 505, pp. 338-49. Date of Electronic Publication: 2014 Oct 18.
DOI: 10.1016/j.scitotenv.2014.09.098
Abstrakt: Since 2009 a policy has been implemented in Brazil to establish the natural concentrations of potentially toxic substances in soil for each state. Historically a 'mining state', Minas Gerais established a Quality Reference Value for metal(loid)s for all of the soils in the state. To successfully establish these values it is important to study the spatial geochemical diversity for the state. In this context, the objectives of this work are: (1) to evaluate the natural concentrations of metal(loid)s in pristine Minas Gerais soils and (2) to interpret the spatial variability in concentration of these elements. The 0-20 cm layer of soils was sampled for 697 georeferenced sites including the main geological materials and soil groups. Soil properties were analyzed according to methodologies suitable for Brazilian soils. The concentration of metal(loid)s was determined by acid extraction according to EPA 3051A. Descriptive statistics, Pearson correlation and spatial variability analyses were performed. The dominance of acidic pH and low CEC values reflects the pervasive deep acid weathering. The variability of metal(loid) concentrations for soils of the state may be attributed to geological diversity and different pedogenesis. Correlation and spatial analysis indicated that the Fe concentration is strongly associated with metal(loid) concentrations in topsoil. According to the spatial geochemical diversity of the state, a k-means cluster analysis was performed which identified four clusters. A significant difference in the mean values of metal(loid) concentrations between the clusters confirmed that the single Quality Reference Value established does not represent the geochemical diversity of soils in Minas Gerais.
(Copyright © 2014 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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