Effects of pH Conditions and Application Rates of Commercial Humic Substances on Cu and Zn Mobility in Anthropogenic Mine Soils

Pérez Esteban, Javier and Escolástico, Consuelo and Sanchís Pérez, Inés and Masaguer Rodríguez, Alberto and Moliner Aramendia, Ana María (2019). Effects of pH Conditions and Application Rates of Commercial Humic Substances on Cu and Zn Mobility in Anthropogenic Mine Soils. "Sustainability", v. 11 (n. 4844); pp. 1-13. ISSN 2071-1050. https://doi.org/10.3390/su11184844.

Description

Title: Effects of pH Conditions and Application Rates of Commercial Humic Substances on Cu and Zn Mobility in Anthropogenic Mine Soils
Author/s:
  • Pérez Esteban, Javier
  • Escolástico, Consuelo
  • Sanchís Pérez, Inés
  • Masaguer Rodríguez, Alberto
  • Moliner Aramendia, Ana María
Item Type: Article
Título de Revista/Publicación: Sustainability
Date: September 2019
ISSN: 2071-1050
Volume: 11
Subjects:
Freetext Keywords: copper; fulvic acid; humic acid; leonardite; metal mobility; soluble organic carbon; zinc
Faculty: E.T.S. de Ingeniería Agronómica, Alimentaria y de Biosistemas (UPM)
Department: Producción Agraria
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We studied the effects of commercial humic substances derived from leonardite at different rates (0, 0.25, 2, 10 g kg−1 ) and pH (4.5, 6.0, 8.0) on Cu and Zn mobility, to evaluate their use for remediation of metal contaminated mine soils and to optimize their application conditions. We conducted a single-step extraction experiment and analyzed extracts for metal concentrations, soluble organic carbon and their E4/E6 ratio (ratio of absorption at 465 to 665 nm). Metal speciation in a soil solution was simulated by the non-ideal competitive adsorption-Donnan (NICA-Donnan) model. Increasing the amount of humic substances and the pH caused higher release rates of soluble organic carbon with a lower humic/fulvic acids ratio. This led to a higher mobility of metals (up to 110 times Cu concentration in control and 12 times for Zn) due to the formation of soluble metal-humic complexes. Speciation modeling predicted that increasing rates of humic substances would result in a higher proportion of Cu and Zn associated with fulvic acids, more mobile than the humic acids fraction. Application of commercial leonardite humic substances at 2–10 g kg−1 and with pH levels similar to or below natural soil could be useful for assisted-phytoextraction of contaminated anthropogenic soils. High rates of humic substances in more alkaline conditions could entail a considerable risk of metal leaching to groundwater, toxicity and transfer to the trophic chain.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainCTM2013-47874-C2-1-RUnspecifiedUnspecifiedBiorremediación de ecosistemas contaminados por metales pesados y contaminantes orgánicos persistentes empleando sustratos y enmiendas ecoeficientes

More information

Item ID: 57403
DC Identifier: http://oa.upm.es/57403/
OAI Identifier: oai:oa.upm.es:57403
DOI: 10.3390/su11184844
Official URL: https://www.mdpi.com/2071-1050/11/18/4844
Deposited by: Memoria Investigacion
Deposited on: 29 Nov 2019 12:59
Last Modified: 29 Nov 2019 12:59
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