Banca de DEFESA: ELLEN DOS SANTOS SILVA BARROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELLEN DOS SANTOS SILVA BARROS
DATE: 04/08/2023
TIME: 09:00
LOCAL: Google Meet
TITLE:

Evaluation of the influence of environmental contamination at Laguna Mundaú (Maceió, AL): determination of mercury in environmental and biological samples

KEY WORDS:

Contamination; Sample preparation; Mercury; Environmental monitoring

PAGES: 55
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

Laguna Mundaú (Maceió - AL) is part of the Mundaú-Manguaba lagoon estuarine complex (CELMM) and is
considered an environment of socioeconomic relevance due to the fishing of the local bivalve, the sururu (Mytella charruana). In this social context, the inappropriate disposal of domestic and industrial waste increases the rate of environmental degradation in this ecosystem, including possible contamination by potentially toxic species, such as mercury. Thus, the present work aimed to determine Hg in environmental matrices (water and sururu from this Lagoon) and biological matrices (blood and urine of local fishermen). To determine Hg concentrations in the different types of samples, cold vapor atomic fluorescence spectrometry (CV AFS) was used. It is noteworthy that in the water samples the concentrations of total, dissolved and inorganic mercury were determined, while in the other samples only the concentrations of total mercury were determined. Preliminary data show that the average concentration of HgDISOLVED and HgINO , respectively, were: sampling 1 (1.97 g L-1 and 0.37 g L-1 ), sampling 2 (2.31 g L-1 and 0.42 g L-1 ) and sampling 3 (0.63 g L-1 and 0.07 g L-1 ), sampling 4 (concentrations below the limit of quantification), sampling 5 (0, 03 g L-1 and 0.01 g L-1) and sampling 6 (0.24 g L-1and <LOQ). According to CONAMA 430/2005, the average concentrations of Hg are above the permitted, except in sample 4 which was preceded by heavy rains in
the city of Maceió - AL. In addition, the quantification of these elements in sururu was carried out, for Hg the average concentration for samples 1 and 2 was 0.29 and 0.22 mg kg-1 . The initial results related to blood Hg levels were 4.68 g L-1 for CELMM fishermen (n= 20) and 2.06 g L-1 for the control group (n=20). With this, the monitoring of Hg and Sb in different samples helps to understand the dynamics of the studied ecosystem and compare it with the concentration levels established by legislation.

BANKING MEMBERS:
Externo(a) à Instituição - FRANCISCO ANTÔNIO DA SILVA CUNHA
Interno(a) - 1613338 - JOSUE CARINHANHA CALDAS SANTOS
Externo(a) à Instituição - LETÍCIA MALTA COSTA
Interno(a) - 1697766 - WANDER GUSTAVO BOTERO