Data/hora: 08/06/2024 11:04:01

Provedor de dados: | 64
País: | Brazil
Título: | Soil management and ionic strength on selenite retention in oxidic soils
Autores: | Araujo,Anderson Mendes; Lessa,Josimar Henrique de Lima; Ferreira,Liniker André; Guilherme,Luiz Roberto Guimarães; Lopes,Guilherme.
Data: | 2018-08-01
Ano: | 2018
Palavras-chave: | Adsorption/desorption reactions; Brazilian soils; Competitive anion; Soil cultivation; Retention/mobility.
Resumo: | ABSTRACT Sorption of selenium (Se) on soils may be influenced by factors that are changed though agricultural practices usually performed for crop production, such as soil pH, competing anion and organic matter contents, among others. This study aimed to evaluate the influence of soil management and ionic strength (IS) on Se retention in Brazilian soils, which is important to predict Se availability in both systems, native and cultivated soils. For that, adsorption and desorption reactions of Se were evaluated in 16 soil samples (eight from cultivated soils and eight from native soils), using solutions containing 100 and 500 µg L-1 Se in the form of sodium selenate and in two IS, 15 and 150 mM. Se adsorption varied as a function of IS for most soils, which may indicate that the adsorption mechanism by outer-sphere complex is important for selenate retention in the studied soils, but future studies involving other techniques, such as spectroscopic studies, are needed to more clearly confirm the adsorption mechanism. In general, adsorption varied in relation to soil characteristics, and native soils adsorbed larger Se amounts than the cultivated soils. In terms of desorption, soils which had larger Se adsorbed amounts also presented larger desorbed amounts. Finally, IS and soil management influenced the availability of selenate in the studied soils.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000400395
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/1413-70542018424007318
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.42 n.4 2018
Fonte: | info:eu-repo/semantics/openAccess