Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants

The lack of mobility of chlorinated organic compounds in electrokinetic systems requires enhancement of the operational parameters. In this study, we investigated the role of ethylenediaminetetraacetic acid (EDTA) as a catholyte additive in enhancing the electrokinetic remediation (EKR) of real-cont...

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Autores: Tiban Anrango, Bryan Andrés, de los Santos , Carolina, Fernández Cascan, Jesús, Sáez Jiménez, Cristina, Rodrigo Rodrigo, Manuel Andrés
Tipo de documento: artigo
Data de publicação:2026
País:España
Recursos:Universidad de Castilla-La Mancha
Repositório:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/47073
Acesso em linha:https://doi.org/10.1016/j.hazadv.2025.100994
https://hdl.handle.net/10578/47073
Access Level:Acceso aberto
Palavra-chave:Chelating agents
Chlorinated organic compounds
Electrokinetic remediation
Electro-osmotic flux
Ethylenediaminetetraacetic acid
Soil washing
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spelling Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutantsTiban Anrango, Bryan Andrésde los Santos , CarolinaFernández Cascan, JesúsSáez Jiménez, CristinaRodrigo Rodrigo, Manuel AndrésChelating agentsChlorinated organic compoundsElectrokinetic remediationElectro-osmotic fluxEthylenediaminetetraacetic acidSoil washingThe lack of mobility of chlorinated organic compounds in electrokinetic systems requires enhancement of the operational parameters. In this study, we investigated the role of ethylenediaminetetraacetic acid (EDTA) as a catholyte additive in enhancing the electrokinetic remediation (EKR) of real-contaminated soils containing chlorinated organic compounds (COCs). Initial soil washing experiments confirmed EDTA’s chelating efficacy, with extraction increasing from 0.006 mmol using pure water to 0.15 mmol with 0.1 M EDTA. Subsequent EKR trials at varying temperatures revealed that EDTA significantly improves COC mobilization, particularly toward the anode, where a 120% increase in molar transport was observed at 10 °C. This enhancement is attributed to the interaction between negatively charged EDTA complexes and chloro-substituted aromatic and alicyclic compounds, facilitating directional migration under an electric field. Temperature played a critical role in optimizing electro-osmotic flux and minimizing evaporation, with sub-25 °C conditions favoring contaminant transport. However, EDTA’s anionic nature also contributed to reduced soil electrical resistance, indirectly supporting electrokinetic performance. Notably, COC mobilization toward the cathode was less pronounced, with only a 20% increase, primarily driven by water movement rather than electrophoretic or electromigration. The study quantified EDTA demand, indicating that 26 mmol and 8 mmol of EDTA are required per mmol of COC mobilized at 10 °C and 25 °C, respectively. Despite lower extraction yields in EKR (0.086 mmol L?¹) compared to soil washing (0.149 mmol L?¹), the findings underscore EDTA’s potential to enhance organic pollutant mobility in electrokinetic systems. This work expands the applicability of chelating agents beyond heavy metals, offering new pathways for remediating complex organic-contaminated matrices.ELSEVIER202620262026info:eu-repo/semantics/articleapplication/pdfapplication/pdfapplication/pdfhttps://doi.org/10.1016/j.hazadv.2025.100994https://hdl.handle.net/10578/47073reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/470732026-05-27T07:36:41Z
dc.title.none.fl_str_mv Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
title Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
spellingShingle Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
Tiban Anrango, Bryan Andrés
Chelating agents
Chlorinated organic compounds
Electrokinetic remediation
Electro-osmotic flux
Ethylenediaminetetraacetic acid
Soil washing
title_short Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
title_full Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
title_fullStr Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
title_full_unstemmed Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
title_sort Reengineering electrokinetics: EDTA-enhanced mobilization of organic soil pollutants
dc.creator.none.fl_str_mv Tiban Anrango, Bryan Andrés
de los Santos , Carolina
Fernández Cascan, Jesús
Sáez Jiménez, Cristina
Rodrigo Rodrigo, Manuel Andrés
author Tiban Anrango, Bryan Andrés
author_facet Tiban Anrango, Bryan Andrés
de los Santos , Carolina
Fernández Cascan, Jesús
Sáez Jiménez, Cristina
Rodrigo Rodrigo, Manuel Andrés
author_role author
author2 de los Santos , Carolina
Fernández Cascan, Jesús
Sáez Jiménez, Cristina
Rodrigo Rodrigo, Manuel Andrés
author2_role author
author
author
author
dc.subject.none.fl_str_mv Chelating agents
Chlorinated organic compounds
Electrokinetic remediation
Electro-osmotic flux
Ethylenediaminetetraacetic acid
Soil washing
topic Chelating agents
Chlorinated organic compounds
Electrokinetic remediation
Electro-osmotic flux
Ethylenediaminetetraacetic acid
Soil washing
description The lack of mobility of chlorinated organic compounds in electrokinetic systems requires enhancement of the operational parameters. In this study, we investigated the role of ethylenediaminetetraacetic acid (EDTA) as a catholyte additive in enhancing the electrokinetic remediation (EKR) of real-contaminated soils containing chlorinated organic compounds (COCs). Initial soil washing experiments confirmed EDTA’s chelating efficacy, with extraction increasing from 0.006 mmol using pure water to 0.15 mmol with 0.1 M EDTA. Subsequent EKR trials at varying temperatures revealed that EDTA significantly improves COC mobilization, particularly toward the anode, where a 120% increase in molar transport was observed at 10 °C. This enhancement is attributed to the interaction between negatively charged EDTA complexes and chloro-substituted aromatic and alicyclic compounds, facilitating directional migration under an electric field. Temperature played a critical role in optimizing electro-osmotic flux and minimizing evaporation, with sub-25 °C conditions favoring contaminant transport. However, EDTA’s anionic nature also contributed to reduced soil electrical resistance, indirectly supporting electrokinetic performance. Notably, COC mobilization toward the cathode was less pronounced, with only a 20% increase, primarily driven by water movement rather than electrophoretic or electromigration. The study quantified EDTA demand, indicating that 26 mmol and 8 mmol of EDTA are required per mmol of COC mobilized at 10 °C and 25 °C, respectively. Despite lower extraction yields in EKR (0.086 mmol L?¹) compared to soil washing (0.149 mmol L?¹), the findings underscore EDTA’s potential to enhance organic pollutant mobility in electrokinetic systems. This work expands the applicability of chelating agents beyond heavy metals, offering new pathways for remediating complex organic-contaminated matrices.
publishDate 2026
dc.date.none.fl_str_mv 2026
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.hazadv.2025.100994
https://hdl.handle.net/10578/47073
url https://doi.org/10.1016/j.hazadv.2025.100994
https://hdl.handle.net/10578/47073
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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application/pdf
application/pdf
dc.publisher.none.fl_str_mv ELSEVIER
publisher.none.fl_str_mv ELSEVIER
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
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