Data/hora: 16/06/2024 00:09:33

Provedor de dados: | 124
País: | Brazil
Título: | Multivariate analyses to establish reference values for soils in Médio Paraíba, state of Rio de Janeiro, Brazil
Autores: | Mattos,Amanda Guimarães de; Lima,Erica Souto Abreu; Amaral Sobrinho,Nelson Moura Brasil do; Zoffoli,Hugo José de Oliveira; Pérez,Daniel Vidal.
Data: | 2018-03-01
Ano: | 2018
Palavras-chave: | Guiding values; Heavy metals; Cluster analysis.
Resumo: | ABSTRACT Quality Reference Values (QRVs) for potentially toxic elements are obtained from background levels in soils. However, this determination from mean values or percentiles is not appropriate given the variability in the natural distribution of these elements in soils. Therefore, the objective of this study was to propose a new methodology to establish the QRVs, using the Médio Paraíba region (RJ, Brazil) as an example, from groups of soils defined based on the pseudo-total levels of B, Ba, Co, Cr, Cu, Ni, Pb, and Zn through the use of multivariate analyses and discriminant functions. A total of 40 points, collected at depths of 0-20 and 20-40 cm, were used for the determination of pseudo-total contents, according to the EPA 3051A methodology. The samples were separated into three groups to better represent the variability of the soils of the region. The classification functions were obtained based on the variables Mn, Fe, and Mg. In general, the groups G1 and G2 presented lower values than the ones obtained when the sample universe was used, whereas G3 presented higher values. The QRVs obtained from the soil groups presented substantial differences that translate into advantages for the management of the contaminated areas of the region.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100001
Editor: | Universidade Federal do Ceará
Relação: | 10.5935/1806-6690.20180001
Formato: | text/html
Fonte: | Revista Ciência Agronômica  v.49 n.1 2018
Fonte: | info:eu-repo/semantics/openAccess