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Title: Effect of ageing on the availability of heavy metals in soils amended with compost and biochar: evaluation of changes in soil and amendment properties
Author: Venegas Sepúlveda, Andrea
Rigol Parera, Anna
Vidal Espinar, Miquel
Keywords: Metalls pesants
Contaminació dels sòls
Compostos orgànics
Heavy metals
Soil pollution
Organic compounds
Issue Date: 28-Jul-2016
Publisher: Springer Verlag
Abstract: Remediation strategies using soil amendments should consider the time dependence of metal availability to identify amendments that can sustainably reduce available pollutant concentrations over time. Drying-wetting cycles were applied on amendments, soils and soil + amendment mixtures, to mimic ageing at field level and investigate its effect on extractable Cd, Cu, Ni, Pb and Zn concentrations from three contaminated soils. The amendments investigated were municipal waste organic compost and biochars. The amendments, soils and mixtures were characterised by their physicochemical properties at different ageing times. The amendments were also characterised in terms of sorption capacity for Cd and Cu. The sorption capacity and the physicochemical properties of the amendments remained constant over the period examined. When mixed with the soils, amendments, especially the compost, immediately reduced the extractable metals in the soils with low pH and acid neutralisation capacity, due to the increase in pH and buffering capacity of the mixtures. The amendments had a relatively minor impact on the metal availability concentrations for the soil with substantially high acid neutralisation capacity. The most important changes in extractable metal concentrations were observed at the beginning of the experiments, ageing having a minor effect on metal concentrations when compared with the initial effect of amendments.
Note: Versió postprint del document publicat a:
It is part of: Environmental Science and Pollution Research, 2016, vol. 23, num. 20, p. 20619-20627
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ISSN: 0944-1344
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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