Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil
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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Sociedade Brasileira de Ciência do Solo
2014
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oai:scielo:S0100-068320140004000122014-10-02Quantification of permanent and variable charges in reference soils of the State of Pernambuco, BrazilCunha,Jailson CavalcanteRuiz,Hugo AlbertoFreire,Maria Betânia Galvão dos SantosAlvarez V.,Víctor HugoFernandes,Raphael Bragança Alves clays cation exchange capacity structural charges pH dependent charges 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.info:eu-repo/semantics/openAccessSociedade Brasileira de Ciência do SoloRevista Brasileira de Ciência do Solo v.38 n.4 20142014-08-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400012en10.1590/S0100-06832014000400012 |
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Cunha,Jailson Cavalcante Ruiz,Hugo Alberto Freire,Maria Betânia Galvão dos Santos Alvarez V.,Víctor Hugo Fernandes,Raphael Bragança Alves |
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Cunha,Jailson Cavalcante Ruiz,Hugo Alberto Freire,Maria Betânia Galvão dos Santos Alvarez V.,Víctor Hugo Fernandes,Raphael Bragança Alves Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil |
author_facet |
Cunha,Jailson Cavalcante Ruiz,Hugo Alberto Freire,Maria Betânia Galvão dos Santos Alvarez V.,Víctor Hugo Fernandes,Raphael Bragança Alves |
author_sort |
Cunha,Jailson Cavalcante |
title |
Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil |
title_short |
Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil |
title_full |
Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil |
title_fullStr |
Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil |
title_full_unstemmed |
Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil |
title_sort |
quantification of permanent and variable charges in reference soils of the state of pernambuco, brazil |
description |
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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Sociedade Brasileira de Ciência do Solo |
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2014 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400012 |
work_keys_str_mv |
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