ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN

ABSTRACT We studied the adsorption-desorption of Cu, Mn, Pb and Zn in Maipo river basin, one of the most perturbed rivers in Chile, and thus determined its tolerance to the addition of these metals into the sediments and the possibility of transferring the metals from the sediments to the water colu...

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Autores principales:	Copaja,Sylvia V., Mauro,Lidia, Vega-Retter,Caren, Véliz,David
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2020
Materias:	Elovich model trace elements sediment Sorption-desorption Freundlich model
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072020000204778
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spelling	oai:scielo:S0717-970720200002047782020-08-14ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASINCopaja,Sylvia V.Mauro,LidiaVega-Retter,CarenVéliz,David Elovich model trace elements sediment Sorption-desorption Freundlich model ABSTRACT We studied the adsorption-desorption of Cu, Mn, Pb and Zn in Maipo river basin, one of the most perturbed rivers in Chile, and thus determined its tolerance to the addition of these metals into the sediments and the possibility of transferring the metals from the sediments to the water column. Sediments were sampled from six sites from the river basin and characterized by their pH, electrical conductivity, organic carbon, total organic carbon, water soluble phosphorus and texture. Batch sorption and kinetics experiments were conducted to obtain the retained amounts onto the sediment samples. The initial concentration of trace elements in the sediment was quantified by AAS. The metals were present in most of the sites. Sorption parameters such as Kd and Koc were determined. Metals were adsorbed in the sediment, with Mn showing the lowest affinity, Kd and Koc values and Freundlich constant (nf) support these results. Desorption less than 1% were observed for Cu, while Pb and Zn ranged from 0.6% to 6.8% and those for Mn ranged from 0% to 17.6% across sites. The tolerance of the Maipo River to metal adsorption in sediments was as follows: Pb> Cu> Zn >Mn. Desorption analysis showed that both Zn and Mn could be transferred from the sediment to the water column. The strongest correlation occurs between the pH and Kd-Pb, indicating that at higher pH values, the Pb adsorption was unfavorable, while the correlation was moderate for Cu, Mn and Zn. On the other hand, there are positive correlations between pairs of metals such as Mn-Cu, Zn-Cu, and Zn-Mn, indicating the competition of these metals for the adsorbent sites. The high concentration of Mn found in the sediment and the possibility of being transferred to the water column, due to its easy of desorption, suggest concern due to its potential risk to aquatic biota.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.65 n.2 20202020-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072020000204778en10.4067/S0717-97072020000204778
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Elovich model trace elements sediment Sorption-desorption Freundlich model
spellingShingle	Elovich model trace elements sediment Sorption-desorption Freundlich model Copaja,Sylvia V. Mauro,Lidia Vega-Retter,Caren Véliz,David ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN
description	ABSTRACT We studied the adsorption-desorption of Cu, Mn, Pb and Zn in Maipo river basin, one of the most perturbed rivers in Chile, and thus determined its tolerance to the addition of these metals into the sediments and the possibility of transferring the metals from the sediments to the water column. Sediments were sampled from six sites from the river basin and characterized by their pH, electrical conductivity, organic carbon, total organic carbon, water soluble phosphorus and texture. Batch sorption and kinetics experiments were conducted to obtain the retained amounts onto the sediment samples. The initial concentration of trace elements in the sediment was quantified by AAS. The metals were present in most of the sites. Sorption parameters such as Kd and Koc were determined. Metals were adsorbed in the sediment, with Mn showing the lowest affinity, Kd and Koc values and Freundlich constant (nf) support these results. Desorption less than 1% were observed for Cu, while Pb and Zn ranged from 0.6% to 6.8% and those for Mn ranged from 0% to 17.6% across sites. The tolerance of the Maipo River to metal adsorption in sediments was as follows: Pb> Cu> Zn >Mn. Desorption analysis showed that both Zn and Mn could be transferred from the sediment to the water column. The strongest correlation occurs between the pH and Kd-Pb, indicating that at higher pH values, the Pb adsorption was unfavorable, while the correlation was moderate for Cu, Mn and Zn. On the other hand, there are positive correlations between pairs of metals such as Mn-Cu, Zn-Cu, and Zn-Mn, indicating the competition of these metals for the adsorbent sites. The high concentration of Mn found in the sediment and the possibility of being transferred to the water column, due to its easy of desorption, suggest concern due to its potential risk to aquatic biota.
author	Copaja,Sylvia V. Mauro,Lidia Vega-Retter,Caren Véliz,David
author_facet	Copaja,Sylvia V. Mauro,Lidia Vega-Retter,Caren Véliz,David
author_sort	Copaja,Sylvia V.
title	ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN
title_short	ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN
title_full	ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN
title_fullStr	ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN
title_full_unstemmed	ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN
title_sort	adsorption-desorption of trace elements in sediments of the maipo river basin
publisher	Sociedad Chilena de Química
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072020000204778
work_keys_str_mv	AT copajasylviav adsorptiondesorptionoftraceelementsinsedimentsofthemaiporiverbasin AT maurolidia adsorptiondesorptionoftraceelementsinsedimentsofthemaiporiverbasin AT vegarettercaren adsorptiondesorptionoftraceelementsinsedimentsofthemaiporiverbasin AT velizdavid adsorptiondesorptionoftraceelementsinsedimentsofthemaiporiverbasin
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ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN

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