Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+

Autores
Kloster, Nanci Soledad; Avena, Marcelo Javier
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Humic acids (HA) interact with the surface of mineral particles leading to the formation of clay-humic complexes that affect the transport of nutrients and contaminants in the environment, soil structure, soil erosion and carbon sequestration by soils. The interaction is influenced by the presence of multivalent ions, such as Ca2+, which enhances the uptake of HA by the particles. This article reports the effects of Ca2+ on the interaction between a HA and a soil clay fraction, both obtained from the same soil sample. The study was performed by using zeta potential measurements, HA adsorption isotherms, Ca2+ adsorption isotherms and microscopy. The results show that at low HA concentrations and low Ca2+ concentrations HA adsorption takes place, but that at high concentrations surface aggregation/precipitation also takes place, process that was seldom reported or analysed in the literature. HA adsorption isotherms only give the overall HA uptake by the solid but they do not allow to differentiate HA adsorption from surface aggregation. However, HA adsorption vs. Ca2+ concentration plots and Ca2+ adsorption isotherms at different HA concentrations can distinguish these two processes quite clearly. In addition, surface aggregation could be undoubtedly observed with optical microscopy. Surface aggregation starts to take place at a 0.7 mM Ca2+ concentration, which is lower than the Ca2+ concentration needed to start HA aggregation in solution. This indicates that the surface of soil minerals acts as a nucleation centre for HA aggregation.
Fil: Kloster, Nanci Soledad. Instituto Nacional de Tecnología Agropecuaria. Centro Regional La Pampa-San Luis. Estación Experimental Agropecuaria Anguil; Argentina
Fil: Avena, Marcelo Javier. Universidad Nacional del Sur. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto de Química del Sur; Argentina
Materia
Acidos Humicos
Materia Orgánica
Suelos
Adsorción Agregación
Carbon Sequestration
Soil Aggregates
Humic Acid Presipitation
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/4712
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/4712
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+Kloster, Nanci SoledadAvena, Marcelo JavierAcidos HumicosMateria OrgánicaSuelosAdsorción AgregaciónCarbon SequestrationSoil AggregatesHumic Acid Presipitationhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Humic acids (HA) interact with the surface of mineral particles leading to the formation of clay-humic complexes that affect the transport of nutrients and contaminants in the environment, soil structure, soil erosion and carbon sequestration by soils. The interaction is influenced by the presence of multivalent ions, such as Ca2+, which enhances the uptake of HA by the particles. This article reports the effects of Ca2+ on the interaction between a HA and a soil clay fraction, both obtained from the same soil sample. The study was performed by using zeta potential measurements, HA adsorption isotherms, Ca2+ adsorption isotherms and microscopy. The results show that at low HA concentrations and low Ca2+ concentrations HA adsorption takes place, but that at high concentrations surface aggregation/precipitation also takes place, process that was seldom reported or analysed in the literature. HA adsorption isotherms only give the overall HA uptake by the solid but they do not allow to differentiate HA adsorption from surface aggregation. However, HA adsorption vs. Ca2+ concentration plots and Ca2+ adsorption isotherms at different HA concentrations can distinguish these two processes quite clearly. In addition, surface aggregation could be undoubtedly observed with optical microscopy. Surface aggregation starts to take place at a 0.7 mM Ca2+ concentration, which is lower than the Ca2+ concentration needed to start HA aggregation in solution. This indicates that the surface of soil minerals acts as a nucleation centre for HA aggregation.Fil: Kloster, Nanci Soledad. Instituto Nacional de Tecnología Agropecuaria. Centro Regional La Pampa-San Luis. Estación Experimental Agropecuaria Anguil; ArgentinaFil: Avena, Marcelo Javier. Universidad Nacional del Sur. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto de Química del Sur; ArgentinaCsiro Publishing2015-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/4712Kloster, Nanci Soledad; Avena, Marcelo Javier; Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+; Csiro Publishing; Environmental Chemistry; 12; 6; 7-2015; 731-7381448-2517enginfo:eu-repo/semantics/altIdentifier/doi/10.1071/EN14157info:eu-repo/semantics/altIdentifier/url/http://www.publish.csiro.au/paper/EN14157.htminfo:eu-repo/semantics/altIdentifier/issn/1448-2517info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:14:30Zoai:ri.conicet.gov.ar:11336/4712instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:14:30.844CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
title Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
spellingShingle Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
Kloster, Nanci Soledad
Acidos Humicos
Materia Orgánica
Suelos
Adsorción Agregación
Carbon Sequestration
Soil Aggregates
Humic Acid Presipitation
title_short Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
title_full Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
title_fullStr Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
title_full_unstemmed Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
title_sort Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+
dc.creator.none.fl_str_mv Kloster, Nanci Soledad
Avena, Marcelo Javier
author Kloster, Nanci Soledad
author_facet Kloster, Nanci Soledad
Avena, Marcelo Javier
author_role author
author2 Avena, Marcelo Javier
author2_role author
dc.subject.none.fl_str_mv Acidos Humicos
Materia Orgánica
Suelos
Adsorción Agregación
Carbon Sequestration
Soil Aggregates
Humic Acid Presipitation
topic Acidos Humicos
Materia Orgánica
Suelos
Adsorción Agregación
Carbon Sequestration
Soil Aggregates
Humic Acid Presipitation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Humic acids (HA) interact with the surface of mineral particles leading to the formation of clay-humic complexes that affect the transport of nutrients and contaminants in the environment, soil structure, soil erosion and carbon sequestration by soils. The interaction is influenced by the presence of multivalent ions, such as Ca2+, which enhances the uptake of HA by the particles. This article reports the effects of Ca2+ on the interaction between a HA and a soil clay fraction, both obtained from the same soil sample. The study was performed by using zeta potential measurements, HA adsorption isotherms, Ca2+ adsorption isotherms and microscopy. The results show that at low HA concentrations and low Ca2+ concentrations HA adsorption takes place, but that at high concentrations surface aggregation/precipitation also takes place, process that was seldom reported or analysed in the literature. HA adsorption isotherms only give the overall HA uptake by the solid but they do not allow to differentiate HA adsorption from surface aggregation. However, HA adsorption vs. Ca2+ concentration plots and Ca2+ adsorption isotherms at different HA concentrations can distinguish these two processes quite clearly. In addition, surface aggregation could be undoubtedly observed with optical microscopy. Surface aggregation starts to take place at a 0.7 mM Ca2+ concentration, which is lower than the Ca2+ concentration needed to start HA aggregation in solution. This indicates that the surface of soil minerals acts as a nucleation centre for HA aggregation.
Fil: Kloster, Nanci Soledad. Instituto Nacional de Tecnología Agropecuaria. Centro Regional La Pampa-San Luis. Estación Experimental Agropecuaria Anguil; Argentina
Fil: Avena, Marcelo Javier. Universidad Nacional del Sur. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto de Química del Sur; Argentina
description Humic acids (HA) interact with the surface of mineral particles leading to the formation of clay-humic complexes that affect the transport of nutrients and contaminants in the environment, soil structure, soil erosion and carbon sequestration by soils. The interaction is influenced by the presence of multivalent ions, such as Ca2+, which enhances the uptake of HA by the particles. This article reports the effects of Ca2+ on the interaction between a HA and a soil clay fraction, both obtained from the same soil sample. The study was performed by using zeta potential measurements, HA adsorption isotherms, Ca2+ adsorption isotherms and microscopy. The results show that at low HA concentrations and low Ca2+ concentrations HA adsorption takes place, but that at high concentrations surface aggregation/precipitation also takes place, process that was seldom reported or analysed in the literature. HA adsorption isotherms only give the overall HA uptake by the solid but they do not allow to differentiate HA adsorption from surface aggregation. However, HA adsorption vs. Ca2+ concentration plots and Ca2+ adsorption isotherms at different HA concentrations can distinguish these two processes quite clearly. In addition, surface aggregation could be undoubtedly observed with optical microscopy. Surface aggregation starts to take place at a 0.7 mM Ca2+ concentration, which is lower than the Ca2+ concentration needed to start HA aggregation in solution. This indicates that the surface of soil minerals acts as a nucleation centre for HA aggregation.
publishDate 2015
dc.date.none.fl_str_mv 2015-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/4712
Kloster, Nanci Soledad; Avena, Marcelo Javier; Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+; Csiro Publishing; Environmental Chemistry; 12; 6; 7-2015; 731-738
1448-2517
url http://hdl.handle.net/11336/4712
identifier_str_mv Kloster, Nanci Soledad; Avena, Marcelo Javier; Interaction of humic acids with soil minerals. Adsorption and surface aggregation induced by Ca2+; Csiro Publishing; Environmental Chemistry; 12; 6; 7-2015; 731-738
1448-2517
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1071/EN14157
info:eu-repo/semantics/altIdentifier/url/http://www.publish.csiro.au/paper/EN14157.htm
info:eu-repo/semantics/altIdentifier/issn/1448-2517
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Csiro Publishing
publisher.none.fl_str_mv Csiro Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1842980775877672960
score 12.993085

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