Sorption of Zn(II) and Cu(II) by four Argentinean soils as affected by pH, oxides, organic matter and clay content

Increasing heavy metal applications to agricultural soils in the form of phosphatic fertilizers and/or atmospheric deposition have led to extensive research on the chemistry of Zn and Cu in soils. Cu(II) and Zn(II) sorption onto different soil fractions of three Mollisols and one Entisol from the so...

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Autores principales: Fernández, Mariela A., Soulages, Olga E., Acebal, Silvia G., Rueda, Elsa H., Torres Sánchez, Rosa María
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Química
Sorption processes
Heavy metals
Clay minerals
Agricultural soils
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127766
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127766
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Sorption processes
Heavy metals
Clay minerals
Agricultural soils
spellingShingle Química
Sorption processes
Heavy metals
Clay minerals
Agricultural soils
Fernández, Mariela A.
Soulages, Olga E.
Acebal, Silvia G.
Rueda, Elsa H.
Torres Sánchez, Rosa María
Sorption of Zn(II) and Cu(II) by four Argentinean soils as affected by pH, oxides, organic matter and clay content
topic_facet Química
Sorption processes
Heavy metals
Clay minerals
Agricultural soils
description Increasing heavy metal applications to agricultural soils in the form of phosphatic fertilizers and/or atmospheric deposition have led to extensive research on the chemistry of Zn and Cu in soils. Cu(II) and Zn(II) sorption onto different soil fractions of three Mollisols and one Entisol from the southwest of Buenos Aires Province, Argentina, was studied. Different variables affecting the sorption capacity such as pH, cation exchange capacity, specific surface area (SSA), type and amount of clay minerals present, content of Fe-, Al-, and Mn-oxides and oxohydroxides, organic matter and electric charge parameters were investigated. To assess the monometal sorption, batch equilibrium experiments were performed using Cu(II) and Zn(II) metal solutions over a pH range from 4.0 to 7.0. The increase in metal sorption with increasing pH for both metal cations was attributed to an increase in the negative surface charges. At pH 5.0, Cu(II) showed more affinity than Zn(II) for reactive surface soil sites. Removal of organic matter via H₂O2₂ treatment (<2- mm OMR fraction) dramatically decreased the sorption of both cations; however, Cu(II) was sorbed more than Zn(II). The variation in SSA (obtained by water vapor adsorption) in<2-lm (clay fraction) and<2-mm (whole soil fraction) after Zn(II)/Cu(II) sorption at pH 4 and 6 reflected a different interaction between both cations and binding surface sites. Sorption isotherms correlated better with Langmuir than Freundlich equations. Sorption capacities (qmax) in <2-lm fraction, ranged from 166 to 111 mmol kg-1 for Cu(II), and from 62 to 31 mmol kg-1 for Zn(II). This study extends the understanding of the sorption mechanisms of Cu(II) and Zn(II) to agricultural soils from the semi-arid Pampean region of Argentina. An understanding of the local soil environment is important in order to reduce or prevent contamination of this valuable resource, especially from fertilizers and other such anthropogenic additions to the soil.
format Articulo
Articulo
author Fernández, Mariela A.
Soulages, Olga E.
Acebal, Silvia G.
Rueda, Elsa H.
Torres Sánchez, Rosa María
author_facet Fernández, Mariela A.
Soulages, Olga E.
Acebal, Silvia G.
Rueda, Elsa H.
Torres Sánchez, Rosa María
author_sort Fernández, Mariela A.
title Sorption of Zn(II) and Cu(II) by four Argentinean soils as affected by pH, oxides, organic matter and clay content
title_short Sorption of Zn(II) and Cu(II) by four Argentinean soils as affected by pH, oxides, organic matter and clay content
title_full Sorption of Zn(II) and Cu(II) by four Argentinean soils as affected by pH, oxides, organic matter and clay content
title_fullStr Sorption of Zn(II) and Cu(II) by four Argentinean soils as affected by pH, oxides, organic matter and clay content
title_full_unstemmed Sorption of Zn(II) and Cu(II) by four Argentinean soils as affected by pH, oxides, organic matter and clay content
title_sort sorption of zn(ii) and cu(ii) by four argentinean soils as affected by ph, oxides, organic matter and clay content
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/127766
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