Temporal changes in arsenic and lead pools in a contaminated sediment amended with biochar pyrolyzed at different temperatures

Autor(es)

Soares, Matheus Bortolanza ^[1] ; dos Santos, Felipe Hipolito ^[1] ; Ferracciu Alleoni, Luis Reynaldo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Soil Sci, ESALQ, USP, Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Chemosphere; v. 287, n. 1 JAN 2022.
• Citações Web of Science: 0

Resumo

Globally, tons of soils and sediments are experiencing degradation due to the presence of high concentrations of potentially toxic elements (PTEs), such as arsenic (As) and lead (Pb), in areas in the vicinity of metal mining activities. The addition of biochar to contaminated sediments is a promising in situ remediation approach, and the effects of pyrolysis temperature and biochar aging are important factors for the immobilization and fate of PTEs. In this study, we evaluated the temporal changes in pools of As and Pb in sediment amended with biochars produced from sugarcane (Saccharum officinarum) pyrolyzed at 350 (BC350), 550 (BC550), and 750 degrees C (BC750). Biochars were aged by natural process (without additional acid or heat), and changes in As and Pb pools were evaluated every 45 days until completing 180 days of incubation. Changes in the As and Pb pools were extracted with water (bioavailable), magnesium chloride (exchangeable), nitric acid (active geochemical fraction), and exchangeable Mehlich-3 (associated with organic matter). As and Pb available contents have increased over time. BC750 was more effective in reducing the bioavailable and exchangeable As contents, while BC550 and BC350 were more effective in reducing the contents of bioavailable and exchangeable Pb. (AU)

• Processo FAPESP: 19/06897-9 - Biogeoquímica de arsênio e chumbo em solo remediado com biocarvão
• Beneficiário: Matheus Bortolanza Soares
• Modalidade de apoio: Bolsas no Brasil - Doutorado