Cadmium, lead, and zinc mobility and plant uptake in a mine soil amended with sugarcane straw biochar

Autor(es)

Puga, A. P. ^[1] ; Abreu, C. A. ^[1] ; Melo, L. C. A. ^[2] ; Paz-Ferreiro, J. ^[3] ; Beesley, L. ^[4]

Afiliação do(s) autor(es)

^[1] Inst Agron Campinas, BR-13020902 Campinas, SP - Brazil

^[2] Univ Fed Lavras, BR-37200000 Lavras, MG - Brazil

^[3] RMIT Univ, Sch Civil Environm & Chem Engn, Melbourne, Vic 3001 - Australia

^[4] James Hutton Inst, Aberdeen AB15 8QH - Scotland

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 22, n. 22, p. 17606-17614, NOV 2015.
• Citações Web of Science: 51

Resumo

Accumulation of heavy metals in unconsolidated soils can prove toxic to proximal environments, if measures are not taken to stabilize soils. One way to minimize the toxicity of metals in soils is the use of materials capable of immobilizing these contaminants by sorption. Biochar (BC) can retain large amounts of heavy metals due to, among other characteristics, its large surface area. In the current experiment, sugarcane-straw-derived biochar, produced at 700 degrees C, was applied to a heavy-metal-contaminated mine soil at 1.5, 3.0, and 5.0 % (w/w). Jack bean and Mucuna aterrima were grown in pots containing a mine contaminated soil and soil mixed with BC. Pore water was sampled to assess the effects of biochar on zinc solubility, while soils were analyzed by DTPA extraction to confirm available metal concentrations. The application of BC decreased the available concentrations of Cd, Pb, and Zn in the mine contaminated soil leading to a consistent reduction in the concentration of Zn in the pore water. Amendment with BC reduced plant uptake of Cd, Pb, and Zn with the jack bean uptaking higher amounts of Cd and Pb than M. aterrima. This study indicates that biochar application during mine soil remediation could reduce plant concentrations of heavy metals. Coupled with this, symptoms of heavy metal toxicity were absent only in plants growing in pots amended with biochar. The reduction in metal bioavailability and other modifications to the substrate induced by the application of biochar may be beneficial to the establishment of a green cover on top of mine soil to aid remediation and reduce risks. (AU)

• Processo FAPESP: 12/01799-0 - Efeitos do biocarvão na mitigação da toxicidade de metais pesados em solo multicontaminado
• Beneficiário: Aline Peregrina Puga
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/04454-9 - Biocarvão na remediação de solos contaminados por metais pesados
• Beneficiário: Cleide Aparecida de Abreu
• Modalidade de apoio: Auxílio à Pesquisa - Regular