Combining phytoextraction by Brassica napus and biochar amendment for the remediation of a mining soil in Riotinto (Spain)

Gasco, G, Alvarez, M, Paz-Ferreiro, J and Mendez, A 2019, 'Combining phytoextraction by Brassica napus and biochar amendment for the remediation of a mining soil in Riotinto (Spain)', Chemosphere, vol. 231, pp. 562-570.


Document type: Journal Article
Collection: Journal Articles

Title Combining phytoextraction by Brassica napus and biochar amendment for the remediation of a mining soil in Riotinto (Spain)
Author(s) Gasco, G
Alvarez, M
Paz-Ferreiro, J
Mendez, A
Year 2019
Journal name Chemosphere
Volume number 231
Start page 562
End page 570
Total pages 9
Publisher Pergamon Press
Abstract Soil contamination in mining areas is an important environmental concern. In these areas, phytoremediation is often impeded because of the low fertility and pH. Assisted phytoremediation is increasingly being used in polluted areas. Biochar could assist plant growth via enhanced soil fertility. An experiment was performed in a mining soil (RIII) from the mining area of Riotinto (Spain) contaminated with Cu, Pb, Zn and As in order to study: (i) The effects of biochar on soil fertility; (ii) Biochar temperature of preparation effect and (iii) Effect of biochar on phytoremediation potential. A mesocosm experiment was designed using Brassica napus as test specie. Soil (RIII) was treated with rabbit manure biochars prepared at 450 °C (BM450) and 600 °C (BM600) at a rate of 10% in mass and incubated for 60 days with or without Brassica napus. Results showed that the combination of BM450 or BM600 with Brassica napus growth decreased the amount of As, Cu, Co, Cr, Se and Pb in the soil. Values of bioaccumulation factor (BAF) for Cd were particularly elevated (>10) in the unamended soil and reached values higher than 1 for other elements, indicating the potential of Brassica napus to accumulate several heavy metals. Translocation Factor (TF) was reduced for Co, Cr, Cd, Cu, Ni, Zn, Pb and As after biochar addition indicating root accumulation of these metals. In all cases, biochar addition increased biomass production. Finally, the addition of BM450 increased GMea index indicating also an improvement on soil quality.
Subject Environmental Engineering not elsewhere classified
Keyword(s) Biochar
Biomass production
Brassica napus
Heavy metals
Soil biochemical properties
Soil quality
DOI - identifier 10.1016/j.chemosphere.2019.05.168
Copyright notice © 2019 Elsevier Ltd
ISSN 0045-6535
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