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Provedor de dados:  Rev. Bras. Ciênc. Solo
País:  Brazil
Título:  Retention and Solute Transport Properties in Disturbed and Undisturbed Soil Samples
Autores:  Silva,Lívia Previatello da
van Lier,Quirijn de Jong
Correa,Marcus Metri
Miranda,Jarbas Honorio de
Oliveira,Luciano Alves de
Data:  2016-01-01
Ano:  2016
Palavras-chave:  Sampling
Retention
Miscible displacement
Solute transport
Leaching
Resumo:  ABSTRACT Solute transport parameters can be determined in miscible displacement experiments, usually performed in columns with disturbed (sieved) soil samples. Experiments with undisturbed samples are uncommon, due to the difficulty of taking undisturbed samples at the size required for these experiments. Structural alteration of the disturbed material implies modifications in the pore geometry that determines hydraulic properties, including hydraulic conductivity and retention and properties related to miscible displacement. An existing model for prediction of breakthrough curves based on retention properties was tested using material from a medium-textured Ferralsol, and alterations caused by sample disturbance were investigated. Soil water retention curves and miscible displacement parameters were determined in breakthrough experiments with nitrate salts in columns filled with undisturbed and disturbed soil samples. Data obtained from the undisturbed samples showed a higher dispersion, suggesting homogenization of pore geometry and a reduction in the representative elementary volume by the disaggregation and sieving of the soil material. The transport parameters for nitrate determined in disturbed and undisturbed samples were significantly different and the model was able to simulate the observed breakthrough curves after fitting the pore connectivity parameter.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100421
Editor:  Sociedade Brasileira de Ciência do Solo
Relação:  10.1590/18069657rbcs20151045
Formato:  text/html
Fonte:  Revista Brasileira de Ciência do Solo v.40 2016
Direitos:  info:eu-repo/semantics/openAccess
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