Immobilization of lead by amendments in a mine-waste impacted soil: Assessing Pb retention with desorption kinetic, sequential extraction and XANES spectroscopy

Autor(es)

Gomes, Frederico Prestes ^[1] ; Barreto, Matheus Sampaio C. ^{[2, 1]} ; Amoozegar, Aziz ^[3] ; Ferracciu Alleoni, Luis Reynaldo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Av Padua Dias 11, BR-13418900 Sao Paulo - Brazil

^[2] Mohammed VI Polytech Univ UM6P, AgroBiosci Program, Benguerir - Morocco

^[3] North Carolina State Univ, Dept Crop & Soil Sci, Raleigh, NC 27695 - USA

• Tipo de documento: Artigo Científico
• Fonte: Science of The Total Environment; v. 807, n. 1 FEB 10 2022.
• Citações Web of Science: 0

Resumo

Chemical stabilization is an in-situ remediation that uses amendments to reduce contaminant availability in polluted soils. Rates of phosphate, lime, biochar, and biosolids were evaluated as affecting Pb speciation and mobility in soil samples of a mining area located in Vazante, state of Minas Gerais, Brazil. Chemical and mineralogical characterization, desorption kinetics, sequential extraction, leaching evaluation in columns and speciation using Xray absorption near edge structure were performed. Pb adsorbed on bentonite and on anglesite were the predominant species in the unamended soil. The treatments with phosphate and lime transformed part of the Pb species to pyromorphite. Conversely, part of Pb species was transformed to Pb adsorbed on citrate in the soil amended with biochar, while PbCl2 was formed in soil samples amended with biosolids. Phosphate and lime increased the Pb extracted in the residual fraction, thus showing that more recalcitrant species, such as pyromorphite, were formed. Biosolids and biochar treatments decreased the Pb in the residual fraction, and the fraction associated to organic matter increased after the addition of biosolids. Phosphate and lime were effective to immobilize Pb and to decrease Pb desorption kinetics, but the organic amendments increased the desorption kinetics of Pb in all rates applied. The soil amended with phosphate decreased the Pb leached in the experiment with leaching columns. (C) 2021 Published by Elsevier B.V. (AU)

• Processo FAPESP: 16/05870-1 - ESPECIAÇÃO E CINÉTICA DE ADSORÇÃO E DESSORÇÃO DE Cd E DE Zn EM SOLOS DE ÁREAS OLERÍCOLAS ALTAMENTE FERTILIZADAS
• Beneficiário: Matheus Sampaio Carneiro Barreto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/13734-0 - Cinética de dessorção e especiação de Zn, Pb e Cd em solos de área de mineração tratados com calcário, fosfato, biocarvão e fertilizante orgânico
• Beneficiário: Frederico Prestes Gomes
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/11700-4 - Cinética de dessorção e especiação de Zn, Pb e Cd em solos de área de mineração tratados com calcário, fosfato, biocarvão e fertilizante orgânico
• Beneficiário: Frederico Prestes Gomes
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 16/22058-9 - Adsorção e dessorção de Cd e Zn em solos tropicais altamente fertilizados
• Beneficiário: Matheus Sampaio Carneiro Barreto
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado