Use of leonardite humic acids for metals extraction in mine soils

Pérez Esteban, Javier and Sinche, Lorena and Escolástico, Consuelo and Masaguer Rodríguez, Alberto and Moliner Aramendia, Ana María (2016). Use of leonardite humic acids for metals extraction in mine soils. In: "5th International EcoSummit Congress", 29/08/2016-01-09-2016, Montpellier (Francia). p. 2.

Description

Title: Use of leonardite humic acids for metals extraction in mine soils
Author/s:
  • Pérez Esteban, Javier
  • Sinche, Lorena
  • Escolástico, Consuelo
  • Masaguer Rodríguez, Alberto
  • Moliner Aramendia, Ana María
Item Type: Presentation at Congress or Conference (Article)
Event Title: 5th International EcoSummit Congress
Event Dates: 29/08/2016-01-09-2016
Event Location: Montpellier (Francia)
Title of Book: EcoSummit 2016 - Ecological Sustainability: Engineering Change
Date: 2016
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Producción Agraria
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Mine soils usually exhibit high levels of metal contamination. Phytoextraction is an environmental friendly and cost-effective technique for soil remediation, which consists of removal of metals from soil by plant roots and their translocation to aerial parts. Humic substances used as soil amendments could enhance metal mobility and uptake by plants due to formation of soluble complexes. This study aimed to evaluate the effects of a commercial humic acid derived from leonardite added at different rates and pH to a contaminated soil from an abandoned copper mine in Colmenarejo (Madrid, Spain) on metal mobility. The objective was to assess its potential as soil amendment for phytoextraction. Soil samples (10 g) were sequentially extracted 6 times with 20 mL of solution containing humic acid at: 0 (control), 0.25, 1, and 5 g L-1. Solutions were previously adjusted to pH: 4, 6.1 (natural soil pH) and 8. Extracts were analyzed for pH, electrical conductivity, metal concentrations (Cu and Zn) and ratio of absorption at 465 to 665 nm (E4/E6) as an indirect measure of soluble organic matter content. Results showed that addition of higher doses of humic acid increased soluble organic matter content, and therefore extracted a higher concentration of Zn and particularly Cu, due to formation of soluble humic complexes. At higher pH humic acid became more soluble and managed to extract increasing amounts of metals, except in the highest humic acid treatment due to its precipitation or flocculation. The use of this humic acid as soil amendment could promote metal phytoextraction by tolerant plants in contaminated mine soils, but it should be applied at proper pH and other soil conditions to avoid risk of metal leaching to groundwater

Funding Projects

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

More information

Item ID: 45038
DC Identifier: http://oa.upm.es/45038/
OAI Identifier: oai:oa.upm.es:45038
Deposited by: Memoria Investigacion
Deposited on: 13 Mar 2017 17:54
Last Modified: 13 Mar 2017 17:54
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