Charge sparsity: An index to quantify cation effects on clay dispersion in soils

Detalhes bibliográficos
Autor(a) principal: Melo, Thadeu Rodrigues de
Data de Publicação: 2020
Outros Autores: Machado, Wesley, Tavares Filho, João
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Scientia Agrícola (Online)
Texto Completo: https://www.revistas.usp.br/sa/article/view/160726
Resumo: Few approaches have been developed to measure the isolated effect of exchangeable cations on clay dispersion in soils. In this study, the charge sparsity (CS) index was proposed using the ratio between the cations hydrated ionic radius and valence. The index capacity to measure cation effects on clay dispersion in soils was also evaluated. Three Ferralsols, sampled at different sites in Paraná State, Brazil, were homoionized with Ca2+, Mg2+, K+, or Na+ prior to evaluation of the clay dispersion degree. Published independent data for two soils and clays were also used. We tested the capacity of CS and II, the latter proposed by Marchuck and Rengasamy (2011), to predict clay dispersion in soils. The CS predicted the dispersion degree more accuratelly than the ionicity index did, in soils where Ca2+ and Mg2+ behaved similarly. The response of Paraná soils to CS varied with soil characteristics. Soils with a lower pH at the isoelectric point were more dispersible by cations with high CS (K+ and Na+). The CS was efficient to quantify the isolated effect of cations on the clay dispersion process in soils. Therefore, qualitative and quantitative studies can benefit from the CS as an index to understand the effect of cations on clay dispersion in soils.
id USP-18_5b6c51f9e015fdb2ad1e50f306bf0d05
oai_identifier_str oai:revistas.usp.br:article/160726
network_acronym_str USP-18
network_name_str Scientia Agrícola (Online)
repository_id_str
spelling Charge sparsity: An index to quantify cation effects on clay dispersion in soilsColloidsElectrical double layeraggregationflocculationzeta potentialFew approaches have been developed to measure the isolated effect of exchangeable cations on clay dispersion in soils. In this study, the charge sparsity (CS) index was proposed using the ratio between the cations hydrated ionic radius and valence. The index capacity to measure cation effects on clay dispersion in soils was also evaluated. Three Ferralsols, sampled at different sites in Paraná State, Brazil, were homoionized with Ca2+, Mg2+, K+, or Na+ prior to evaluation of the clay dispersion degree. Published independent data for two soils and clays were also used. We tested the capacity of CS and II, the latter proposed by Marchuck and Rengasamy (2011), to predict clay dispersion in soils. The CS predicted the dispersion degree more accuratelly than the ionicity index did, in soils where Ca2+ and Mg2+ behaved similarly. The response of Paraná soils to CS varied with soil characteristics. Soils with a lower pH at the isoelectric point were more dispersible by cations with high CS (K+ and Na+). The CS was efficient to quantify the isolated effect of cations on the clay dispersion process in soils. Therefore, qualitative and quantitative studies can benefit from the CS as an index to understand the effect of cations on clay dispersion in soils.Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz2020-02-20info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/sa/article/view/16072610.1590/1678-992x-2017-0392Scientia Agricola; v. 77 n. 1 (2020); e20170392Scientia Agricola; Vol. 77 Núm. 1 (2020); e20170392Scientia Agricola; Vol. 77 No. 1 (2020); e201703921678-992X0103-9016reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/sa/article/view/160726/154971Copyright (c) 2020 Scientia Agricolainfo:eu-repo/semantics/openAccessMelo, Thadeu Rodrigues deMachado, WesleyTavares Filho, João2019-08-05T18:27:37Zoai:revistas.usp.br:article/160726Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2019-08-05T18:27:37Scientia Agrícola (Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Charge sparsity: An index to quantify cation effects on clay dispersion in soils
title Charge sparsity: An index to quantify cation effects on clay dispersion in soils
spellingShingle Charge sparsity: An index to quantify cation effects on clay dispersion in soils
Melo, Thadeu Rodrigues de
Colloids
Electrical double layer
aggregation
flocculation
zeta potential
title_short Charge sparsity: An index to quantify cation effects on clay dispersion in soils
title_full Charge sparsity: An index to quantify cation effects on clay dispersion in soils
title_fullStr Charge sparsity: An index to quantify cation effects on clay dispersion in soils
title_full_unstemmed Charge sparsity: An index to quantify cation effects on clay dispersion in soils
title_sort Charge sparsity: An index to quantify cation effects on clay dispersion in soils
author Melo, Thadeu Rodrigues de
author_facet Melo, Thadeu Rodrigues de
Machado, Wesley
Tavares Filho, João
author_role author
author2 Machado, Wesley
Tavares Filho, João
author2_role author
author
dc.contributor.author.fl_str_mv Melo, Thadeu Rodrigues de
Machado, Wesley
Tavares Filho, João
dc.subject.por.fl_str_mv Colloids
Electrical double layer
aggregation
flocculation
zeta potential
topic Colloids
Electrical double layer
aggregation
flocculation
zeta potential
description Few approaches have been developed to measure the isolated effect of exchangeable cations on clay dispersion in soils. In this study, the charge sparsity (CS) index was proposed using the ratio between the cations hydrated ionic radius and valence. The index capacity to measure cation effects on clay dispersion in soils was also evaluated. Three Ferralsols, sampled at different sites in Paraná State, Brazil, were homoionized with Ca2+, Mg2+, K+, or Na+ prior to evaluation of the clay dispersion degree. Published independent data for two soils and clays were also used. We tested the capacity of CS and II, the latter proposed by Marchuck and Rengasamy (2011), to predict clay dispersion in soils. The CS predicted the dispersion degree more accuratelly than the ionicity index did, in soils where Ca2+ and Mg2+ behaved similarly. The response of Paraná soils to CS varied with soil characteristics. Soils with a lower pH at the isoelectric point were more dispersible by cations with high CS (K+ and Na+). The CS was efficient to quantify the isolated effect of cations on the clay dispersion process in soils. Therefore, qualitative and quantitative studies can benefit from the CS as an index to understand the effect of cations on clay dispersion in soils.
publishDate 2020
dc.date.none.fl_str_mv 2020-02-20
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://www.revistas.usp.br/sa/article/view/160726
10.1590/1678-992x-2017-0392
url https://www.revistas.usp.br/sa/article/view/160726
identifier_str_mv 10.1590/1678-992x-2017-0392
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://www.revistas.usp.br/sa/article/view/160726/154971
dc.rights.driver.fl_str_mv Copyright (c) 2020 Scientia Agricola
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2020 Scientia Agricola
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
publisher.none.fl_str_mv Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
dc.source.none.fl_str_mv Scientia Agricola; v. 77 n. 1 (2020); e20170392
Scientia Agricola; Vol. 77 Núm. 1 (2020); e20170392
Scientia Agricola; Vol. 77 No. 1 (2020); e20170392
1678-992X
0103-9016
reponame:Scientia Agrícola (Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Scientia Agrícola (Online)
collection Scientia Agrícola (Online)
repository.name.fl_str_mv Scientia Agrícola (Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv scientia@usp.br||alleoni@usp.br
_version_ 1800222794035757056