Ion leaching and soil solution acidification in a vadose zone under soil treated with sewage sludge for agriculture

Autor(es)

Borba, Ricardo Perobelli ^[1] ; Ribeirinho, Victor Sanches ^[2] ; de Camargo, Otavio Antonio ^[3] ; de Andrade, Cristiano Alberto ^[2] ; Kira, Carmen Silvia ^[4] ; Coscione, Aline Renee ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Geosci Inst, RuaCarlos Gomes 250, BR-13083855 Campinas, SP - Brazil

^[2] EMBRAPA Environm, Brasilia, DF - Brazil

^[3] Agron Inst Campinas SP, Soil & Environm Resources Ctr, Av Barao Itapura 1481, BR-13012970 Campinas, SP - Brazil

^[4] Adolfo Lutz Inst, Food Ctr, Av Dr Arnaldo 355, BR-01246902 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Chemosphere; v. 192, p. 81-89, FEB 2018.
• Citações Web of Science: 3

Resumo

In this study, we performed monitoring of the soil solution (SS) over 10 years on a loamy/clayey-textured Dark Red Dystroferric Oxisol that received sewage sludge for agricultural purposes. The SS was obtained by lysimeters installed along the walls of a well at 1 m, 2 m, 3 m, 4 m and 5 m in depth. The major ions found in the SS were NO3-, SO42- , Cl-, Ca2+, Mg2+,Al3+, Pb2+, Cd2+ and Zn2+, and the pH level ranged from 4 to 6.5 along the profile. Throughout the first three years of monitoring, the pH to a 3-m depth became more acidic, and in the last year, this trend reached 5 m. At the 5-m depth, the pH decreased from 6.5 to 4.5 from the first to the last monitoring. The SS acidification was provoked by both nitrite oxidation and ion leaching. The leaching of H+ or the possible ion exchange/desorption of H+ due to the leached cations (Ca2+ and Mg2+) at the 4-m and 5-m depth caused the pH decrease. The ionic strength (IS) of the solution controlled the ion leaching. The sludge application increased the IS to 3 m, increasing the density of the soil charges and its ability to absorb ions. After the sludge application was completed, there was a decrease in IS of the SS as well as a decrease in ion absorption and retention abilities, which promoted leaching to greater depths. During the entire monitoring process, NO3-, Cd and Pb remained above the potability limit. (c) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/19106-8 - Interações entre a matéria orgânica e metais em diferentes frações químicas num latossolo tratado com lodo de esgoto a longo prazo
• Beneficiário: Victor Sanches Ribeirinho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 03/10949-6 - Mobilidade de metais pesados (Cd, Cu, Ni, Pb e Zn) na zona não saturada, e possível contaminação do aquífero livre, decorrente da aplicação agrícola do lodo de esgoto em latossolo ácido
• Beneficiário: Ricardo Perobelli Borba
• Modalidade de apoio: Auxílio à Pesquisa - Programa Primeiros Projetos
• Processo FAPESP: 02/09667-3 - Mobilidade de metais pesados (cd, cu, ni, pb, zn) na zona nao saturada, e possivel contaminacao do aquifero livre, decorrente da aplicacao agricola do lodo de esgoto em latossolo acido.
• Beneficiário: Ricardo Perobelli Borba
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 02/12671-2 - Mobilidade de metais pesados (Cd, Cu, Ni,Pb e Zn) na zona não saturada, e possível contaminação do aquífero livre, decorrente da aplicação agrícola do lodo de esgoto em latossolo ácido
• Beneficiário: Otávio Antonio de Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular