Banca de DEFESA: HERCÍLIA SAMARA CARDOSO DA COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : HERCÍLIA SAMARA CARDOSO DA COSTA
DATA : 20/02/2020
HORA: 14:00
LOCAL: Auditório PgAgro
TÍTULO:

POTENTIALLY TOXIC ELEMENTS IN GOLD MINE SOIL AMENDED WITH IRON-IMPREGNATED BIOCHAR

PALAVRAS-CHAVES:

Biocarbon. Ipomea asarifolia. Multicontaminated soils. Remediation

 

Biochar. Ipomea asarifolia. Multicontaminated soils. Remediation

PÁGINAS: 50
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Manejo e Conservação do Solo
RESUMO:

The increasing environmental pollution in the last decades has been causing potentially toxic elements (PTEs), a constant threat to terrestrial and aquatic ecosystems and human health, especially in mining areas. The use of biochar and PTE-tolerant species was used to remedy the soil, arousing great research interest. However, these techniques must be improved. The objective was to evaluate the influence of açaí biochar non- impregnated (BC) and impregnated with iron (BFe) on the bioavailability of EPTs, a multicontaminated soil in the mining area, in the Amazon. The experiment was conducted in a greenhouse, at the Federal Rural University of the Amazon, with seven treatments and four replications: T1 = naturally contaminated soil (SC), T2 = soil of natural vegetation (SM), T3 = SC + SM, T4 = SC + SM + BC, T5 = SC + SM + BFe, T6 = SC + BC, T7 = SC + BFe. The BC raises the pH of soils while BFe has reduced. As the applications of biochar increased the total levels of Ca, Mg, P and K in the soil, but decreased in their availability. Biochar affected the mobility of PTEs in the soil, reducing the levels of oxidizable fraction (linked to organic matter). As plants cultivated with biochar present lower dry matter yield, in addition to a higher concentration of PTEs and lower nutrient content. This suggests that biochar increased the adsorption of basic bases, reducing competition with metallic parts and resulting in greater absorption of PTEs by plants. The use of BC and BFe did not favor the immobilization of PTEs in the soil. BC’s influence As mobility with a reduction in fractions associated with arsenides and sulfates (F5) and an increase in other fractions, mainly associated with very crystalline Fe oxides and hydroxysulfates (F4). BC increased As in the easily soluble fraction which resulted in greater absorption by plants and the lowest biomass of the plants. The application of BC and BFe to multicontaminated soil must be performed with caution, considering the chemical resources of the soil and the resources of the PTEs adverse impact on soil containing As.

MEMBROS DA BANCA:
Presidente - 6388356 - ANTONIO RODRIGUES FERNANDES
Externo à Instituição - LEÔNIDAS CARRIJO AZEVEDO MELO - UFLA
Externo à Instituição - EDNA SANTOS DE SOUZA - UNIFESSPA
Externo à Instituição - CRISTINE BASTOS DO AMARANTE - MPEG