Memorias de investigación
Research Publications in journals:
Effects of pH Conditions and Application Rates of Commercial Humic Substances on Cu and Zn Mobility in Anthropogenic Mine Soils
Year:2019

Research Areas
  • Degradation of the environment

Information
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
International
Si
JCR
Si
Title
Sustainability
ISBN
2071-1050
Impact factor JCR
2,576
Impact info
Datos JCR del año 2019
Volume
11
10.3390/su11184844
Journal number
19
From page
4844-1
To page
4844-13
Month
SEPTIEMBRE
Ranking
JCR Impact index 2.576 Environmental Sciences 120/265 Q2 en 2019
Participants

Research Group, Departaments and Institutes related
  • Creador: Departamento: Producción Agraria