Banca de QUALIFICAÇÃO: PEDRO PAULO DA COSTA ALVES FILHO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : PEDRO PAULO DA COSTA ALVES FILHO
DATE: 30/11/2023
TIME: 14:00
LOCAL: Auditório do PgAgro
TITLE:

Environmental and human health risk of potentially toxic elements in waste from artisanal cassiterite and monazite mining areas in the Amazon

KEY WORDS:

Rare earth elements, chemical properties, bioavailability, metals and metalloids, pollution indices.

PAGES: 65
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:

Mineral exploration is essential for global economic development. In the Amazon region, artisanal exploration is predominant and carried out on a large scale, without concern for environmental impacts and human health, mainly due to the release of large quantities of potentially toxic elements (PTEs), including rare earths. Rare earth elements are represented by the lanthanide family, scandium and yttrium, being a group of elements essential for the maintenance of technologies. In the region of São Felix do Xingú, located in the Amazon craton, there is the presence of minerals composed of rare earths, among these minerals are monazite and cassiterite. In chapter 1, the risk to the environment and human health in residues (sterile and tailings) from three artisanal cassiterite and monazite mining areas were evaluated, as a function of time after exploration. In chapter 2, will be determined the environmental and human health risk indices of PTEs (metal(loid)s) that presented concentrations above the quality reference value for the state of Pará. In chapter 3, chemical fractionation and the pulmonary, dermal and oral bioaccessibility of REEs will be carried out in samples with concentrations that pose risks to the environment and human health. 35 samples were collected, 3 samples from forest areas, as reference, and 32 samples from residues from active exploration, deactivated one and 10 years ago. REEs and EPT concentrations were quantified by alkaline fusion and ICP-MS. The results were used to calculate pollution, environmental risk and human health indices. Residues from the exploration of monazite and cassiterite caused increased concentrations, high enrichment and a high contamination factor by REEs. Waste from active and recently deactivated mines presented a high ecological risk. The results indicate that artisanal mining of cassiterite and monazite has the potential for contamination and enrichment by EPTs and REEs.

BANKING MEMBERS:
Presidente - 6388356 - ANTONIO RODRIGUES FERNANDES
Externo à Instituição - FLÁVIO HENRIQUE SILVEIRA RABELO - UFLA
Externo à Instituição - MATHEUS BORTOLANZA SOARES - USP
Externo à Instituição - PAULA GODINHO RIBEIRO - ITV