Organic acids effects on desorption of heavy metals from a contaminated soil

Organic acids effects on desorption of heavy metals from a contaminated soil

Phytoremediation of heavy metals is a biotechnology that extracts metals from soils and transfer them to plant. As hyperaccumulator species have demonstrated low potential for commercial phytoextraction, synthetic chelates have been successfully used to induce accumulation of metals by high-biomass plants. However, they pose serious environmental drawbacks regarding excessive amount of metals solubilized. In search for synthetic chelate-alternatives, this paper evaluate the performance of DTPA, EDTA, citric acid, oxalic acid, vanillic acid, and gallic acid in desorbing Cd, Pb, Zn, Cu, and Ni from soil. DTPA and EDTA were highly effective in desorbing Cd, Pb, Zn, Cu, and Ni from soil. However, the excessively high concentration of metals brought in solution by such chelates limits their application in the field. Citric and oxalic acids desorbed substantial quantities of Zn, Cu, and Ni if applied at 10 or 20 mmol kg-1. At the 20 mmol kg-1 dose, vanillic and gallic acids solubilized significant amounts of Zn, Ni, and Cd from soil. None of the tested low molecular weight organic acids substantially increased the Pb concentration in soil solution.

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Main Author: Nascimento,Clístenes Williams Araújo do
Format: Digital revista
Language:English
Published: Escola Superior de Agricultura "Luiz de Queiroz" 2006
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300010
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spelling oai:scielo:S0103-901620060003000102006-06-26Organic acids effects on desorption of heavy metals from a contaminated soilNascimento,Clístenes Williams Araújo do phytoremediation phytoextraction soil pollution Phytoremediation of heavy metals is a biotechnology that extracts metals from soils and transfer them to plant. As hyperaccumulator species have demonstrated low potential for commercial phytoextraction, synthetic chelates have been successfully used to induce accumulation of metals by high-biomass plants. However, they pose serious environmental drawbacks regarding excessive amount of metals solubilized. In search for synthetic chelate-alternatives, this paper evaluate the performance of DTPA, EDTA, citric acid, oxalic acid, vanillic acid, and gallic acid in desorbing Cd, Pb, Zn, Cu, and Ni from soil. DTPA and EDTA were highly effective in desorbing Cd, Pb, Zn, Cu, and Ni from soil. However, the excessively high concentration of metals brought in solution by such chelates limits their application in the field. Citric and oxalic acids desorbed substantial quantities of Zn, Cu, and Ni if applied at 10 or 20 mmol kg-1. At the 20 mmol kg-1 dose, vanillic and gallic acids solubilized significant amounts of Zn, Ni, and Cd from soil. None of the tested low molecular weight organic acids substantially increased the Pb concentration in soil solution.info:eu-repo/semantics/openAccessEscola Superior de Agricultura "Luiz de Queiroz"Scientia Agricola v.63 n.3 20062006-06-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300010en10.1590/S0103-90162006000300010
institution SCIELO
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country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Nascimento,Clístenes Williams Araújo do
spellingShingle Nascimento,Clístenes Williams Araújo do
Organic acids effects on desorption of heavy metals from a contaminated soil
author_facet Nascimento,Clístenes Williams Araújo do
author_sort Nascimento,Clístenes Williams Araújo do
title Organic acids effects on desorption of heavy metals from a contaminated soil
title_short Organic acids effects on desorption of heavy metals from a contaminated soil
title_full Organic acids effects on desorption of heavy metals from a contaminated soil
title_fullStr Organic acids effects on desorption of heavy metals from a contaminated soil
title_full_unstemmed Organic acids effects on desorption of heavy metals from a contaminated soil
title_sort organic acids effects on desorption of heavy metals from a contaminated soil
description Phytoremediation of heavy metals is a biotechnology that extracts metals from soils and transfer them to plant. As hyperaccumulator species have demonstrated low potential for commercial phytoextraction, synthetic chelates have been successfully used to induce accumulation of metals by high-biomass plants. However, they pose serious environmental drawbacks regarding excessive amount of metals solubilized. In search for synthetic chelate-alternatives, this paper evaluate the performance of DTPA, EDTA, citric acid, oxalic acid, vanillic acid, and gallic acid in desorbing Cd, Pb, Zn, Cu, and Ni from soil. DTPA and EDTA were highly effective in desorbing Cd, Pb, Zn, Cu, and Ni from soil. However, the excessively high concentration of metals brought in solution by such chelates limits their application in the field. Citric and oxalic acids desorbed substantial quantities of Zn, Cu, and Ni if applied at 10 or 20 mmol kg-1. At the 20 mmol kg-1 dose, vanillic and gallic acids solubilized significant amounts of Zn, Ni, and Cd from soil. None of the tested low molecular weight organic acids substantially increased the Pb concentration in soil solution.
publisher Escola Superior de Agricultura "Luiz de Queiroz"
publishDate 2006
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300010
work_keys_str_mv AT nascimentoclisteneswilliamsaraujodo organicacidseffectsondesorptionofheavymetalsfromacontaminatedsoil
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