Banca de DEFESA: RONEPABLO DA SILVA ALVES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RONEPABLO DA SILVA ALVES
DATE: 26/03/2025
TIME: 14:30
LOCAL: Sala da Pós-Graduação
TITLE:

Dynamics of Mercury, Lead, Cadmium, and Arsenic in Amazonian Waters: Environmental Impact and One Health Risk

KEY WORDS:

Contamination, heavy metals, water quality, land use and occupation, fish farm, agriculture

PAGES: 55
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Economic growth in the Amazon has exposed water bodies to various contaminants, such as pesticides and heavy metals. Agriculture and livestock farming are significant to the economy and culture of the state of Rondônia, including cattle raising and fish farming, making it a region where aquatic contaminants can have a substantial sanitary and economic impact. Mercury, lead, cadmium, and arsenic have no biological function. They can cause various health hazards, becoming even more concerning due to increasing environmental levels from human activities. Given the lack of similar studies in the region, the intensive agricultural and livestock exploitation, the presence of Indigenous lands, and environmental conservation units downstream of the sub-basin, mercury, lead, cadmium, and arsenic levels were investigated in the Rio Branco sub-basin, also aiming to assess possible correlations with environmental and human factors. Samples were collected during dry and rainy seasons, upstream and downstream of fish farms. Mercury was analyzed using Cold Vapor Atomic Fluorescence Spectroscopy (CV-AFS), while the other elements were analyzed using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The physicochemical parameters of the water were measured using a multiparameter meter, and land use and occupation data were obtained for the surroundings of the fish farms. It was observed that 84.72% of land use was for pasture, 11.02% for forest formation, and 4.26% for other uses. The average concentrations were 13.77 ng/L for mercury, 14.27 μg/L for lead, 5.48 μg/L for cadmium, and 1.93 μg/L for arsenic. Mercury concentrations were higher than expected for a region without mining activity, with elevated values also for lead and cadmium. Arsenic levels were within the considered safe limits. No influence of fish farming activity on the levels of these elements was detected. Land use showed a moderate correlation with the measured concentrations.

COMMITTEE MEMBERS:
Presidente - 1658780 - EMANUEL FERNANDO MAIA DE SOUZA
Interno - 2248433 - IZAIAS MEDICE FERNANDES
Interno - 1123716 - ADRIANO REIS PRAZERES MASCARENHAS
Externo ao Programa - 359961 - WANDERLEY RODRIGUES BASTOS - UNIRExterno ao Programa - 1361358 - JHONY VENDRUSCOLO - UNIRExterno ao Programa - 1905088 - RONALDO DE ALMEIDA - UNIRExterna à Instituição - DANIELE KASPER - UFMG