| Registro completo |
| Provedor de dados: |
Rev. Bras. Ciênc. Solo
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| País: |
Brazil
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| Título: |
Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil
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| Autores: |
Cunha,Jailson Cavalcante
Ruiz,Hugo Alberto
Freire,Maria Betânia Galvão dos Santos
Alvarez V.,Víctor Hugo
Fernandes,Raphael Bragança Alves
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| Data: |
2014-08-01
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| Ano: |
2014
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| Palavras-chave: |
Clays
Cation exchange capacity
Structural charges
PH dependent charges
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| Resumo: |
The electrical charges in soil particles are divided into structural or permanent charges and variable charges. Permanent charges develop on the soil particle surface by isomorphic substitution. Variable charges arise from dissociation and association of protons (H+), protonation or deprotonation, and specific adsorption of cations and anions. The aim of this study was to quantify the permanent charges and variable charges of Reference Soils of the State of Pernambuco, Brazil. To do so, 24 subsurface profiles from different regions (nine in the Zona da Mata, eight in the Agreste, and seven in the Sertão) were sampled, representing approximately 80 % of the total area of the state. Measurements were performed using cesium chloride solution. Determination was made of the permanent charges and the charges in regard to the hydroxyl functional groups through selective ion exchange of Cs+ by Li+ and Cs+ by NH4+, respectively. All the soils analyzed exhibited variable cation exchange capacity, with proportions from 0.16 to 0.60 and an average of 0.40 when related to total cation exchange capacity.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400012
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| Editor: |
Sociedade Brasileira de Ciência do Solo
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| Relação: |
10.1590/S0100-06832014000400012
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Ciência do Solo v.38 n.4 2014
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| Direitos: |
info:eu-repo/semantics/openAccess
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