Banca de DEFESA: HAMILTON FERREIRA DE SOUZA NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : HAMILTON FERREIRA DE SOUZA NETO
DATA : 31/05/2019
HORA: 09:00
LOCAL: Auditório PgAgro
TÍTULO:

Geochemistry of metals and metalloids in the area of gold mining in the paraense Amazon

PALAVRAS-CHAVES:

Contamination. Heavy Metals. Pollution rates. Mining of Au.

PÁGINAS: 5
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Manejo e Conservação do Solo
RESUMO:

The Amazon is an important source of natural resources, rich in biodiversity, water resources and minerals, providing important ecological services to the world, such as storing fresh water and minimizing the effects of global warming. Therefore, studies demonstrating the dynamics of potentially toxic elements (PTEs), such as metals and metalloids in soil, are of great relevance. The identification of the concentrations of these elements is indispensable for control and decision making in order to avoid environmental impacts and the health of plants and animals, including humans. The concentration of PTEs in Piriá Watercourse in soil samples under native forest and tailings of different types of gold (Au) exploration, as well as chemical and physical attributes, and their relationships with PTEs were determined. In order to evaluate the degree of pollution, the enrichment factor (EF), contamination factor (CF), geoaccumulation index (Igeo), pollution load index (PLI), potential ecological risk (PER) and ecological risk multi-element combination (IR). High levels of PTEs were found in the rejects of the Au exploration areas, values higher than those of research (VI), defined by CONAMA, which characterizes polluted areas. The concentrations of As, Co, Cr, Ni, and Sb. Of the 18 elements evaluated only Ag, Cd and Si are at levels corresponding to the natural values, ie, soil quality reference values (QRVs) for the state of Pará. are above VI, while Hg and Mn are above the prevention values defined by CONAMA, and above the world average. There was enrichment of the PTEs As, Ni, Sb, Ag and Mo. All the elements presented moderate to highly contaminated CF in at least one of the garimpos, demonstrating contamination by EPTs. The PLI indicated deterioration of the soil in all the mines. It featured PER for various elements in all prospects, as well as extremely high RI for a large number of PTEs. From the pollution rates determined for the artisanal mining areas we can infer the need for immediate actions for remediation, aiming at reducing the environmental risks and the health of the local population.

MEMBROS DA BANCA:
Presidente - 6388356 - ANTONIO RODRIGUES FERNANDES
Externo à Instituição - RENATO ALVES TEIXEIRA - ITV
Externo à Instituição - RAFAEL SILVA GUEDES - ITV
Externo à Instituição - CRISTINE BASTOS DO AMARANTE - INT