Effects of pH Conditions and Application Rates of Commercial Humic Substances on Cu and Zn Mobility in Anthropogenic Mine Soils
| Autor: | Ana Moliner, Consuelo Escolástico, Alberto Masaguer, Inés Sanchis, Javier Pérez-Esteban |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Environmental remediation
media_common.quotation_subject lcsh:TJ807-830 Geography Planning and Development lcsh:Renewable energy sources 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology Zinc humic acid leonardite 010501 environmental sciences Management Monitoring Policy and Law complex mixtures 01 natural sciences Leonardite Humic acid lcsh:Environmental sciences 0105 earth and related environmental sciences media_common lcsh:GE1-350 Total organic carbon chemistry.chemical_classification 021110 strategic defence & security studies Renewable Energy Sustainability and the Environment lcsh:Environmental effects of industries and plants Extraction (chemistry) metal mobility zinc Química Building and Construction soluble organic carbon 6. Clean water Speciation lcsh:TD194-195 chemistry 13. Climate action Environmental chemistry copper Soil water fulvic acid |
| Zdroj: | Sustainability Volume 11 Issue 18 Sustainability, ISSN 2071-1050, 2019-09, Vol. 11, No. 4844 Archivo Digital UPM Universidad Politécnica de Madrid Sustainability, Vol 11, Iss 18, p 4844 (2019) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su11184844 |
| Popis: | We studied the effects of commercial humic substances derived from leonardite at different rates (0, 0.25, 2, 10 g kg&minus 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&ndash 10 g kg&minus 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. |
| Databáze: | OpenAIRE |
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