Banca de QUALIFICAÇÃO: JAQUELINE DEUSDARA PINHEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JAQUELINE DEUSDARA PINHEIRO
DATA : 25/04/2022
HORA: 13:00
LOCAL: ENSINO REMOTO EMERGENCIAL
TÍTULO:

Mercury sources in the North Pantanal

PALAVRAS-CHAVES:

ecotoxicology; flooded area; heavy metal

PÁGINAS: 72
GRANDE ÁREA: Ciências Biológicas
ÁREA: Bioquímica
RESUMO:

Mercury (Hg) is a global concern due to its adverse effects on human health, food safety and the environment. It is one of the most serious environmental pollutants and related toxic compounds can be easily transferred to water, soil and sediment. The accumulation over time of large inputs of Hg into the environment results in the widespread occurrence of Hg throughout the food chain, requiring action to identify the main local sources of Hg. The Brazilian Pantanal is a floodplain covering an area of almost 140,000 km 2 and is subject to seasonal and monomodal floods, mostly once a year. As the final receptor of pollutants, derived from anthropogenic pressures, it is a vulnerable region threatened by recent trends in economic development, mainly by persistent and lethal fires that occurred mainly in the years 2018 to 2020. Traces of mercury have already been found in algae, fish and reptiles in the North Pantanal; which brings concern for the fragile balance of this ecosystem as well as for the health of the animals and the riverside population. In this sense, the objective of this research was to evaluate the origin of mercury in the North Pantanal Ecosystem. With an exploratory methodology, the collections took place in the springs, course and mouths of the Jauru, Cabaçal, Sepotuba and Paraguai rivers, whose waters form upstream of the edges of the Pantanal. Forty-eight points were considered, and samples of leaves, soil, sediment, zooplankton and particulate matter in water were collected. To determine the THg, a direct analyzer (DMA 80) was used, followed by statistical analyses. There were significant relationships of the four rivers and areas studied for soil (p<0.05). And between the spring, course and mouth areas, there were significant relationships for sediments (p<0.05). Among the studied rivers, the Cabaçal river presented the highest concentration of THg for zooplankton, (11.01 ± 5.34 ug/kg), soil (15.58 ± 16.77 ug/kg) and leaves (21.81 ± 10.18 ug/kg), while the Jauru River presented for sediments (3.67 ± 21.47 ug/kg). The Cabaçal River was associated with intense sedimentation of the basin lithology and the occurrence of Latosols, associated with land use, in addition to the fluvial dynamics itself. The Jauru River associated with PCHs established in the region since 1990. The concentrations found even below the limits established by the National Health Surveillance Agency (ANVISA) and the National Council for the Environment (CONAMA) require government actions to prevent environmental contamination, guiding and aware of the risks to which the population may be exposed, as well as the preservation of this fragile ecosystem. Continuous monitoring should occur mainly because the number of fires has increased in the last two years (2020-2021) in the Pantanal Biome.

MEMBROS DA BANCA:
Presidente - 83200001 - AUREA REGINA ALVES IGNACIO
Externo à Instituição - Clístenes Williams Araújo do Nascimento - UFRPE
Interno - 118188001 - ERNANDES SOBREIRA OLIVEIRA JUNIOR
Interno - 110049004 - MARIA APARECIDA PEREIRA PIERANGELI
Interno - 001.165.931-99 - WILKINSON LOPES LAZARO - UFRJ