Banca de DEFESA: LUANNA MAIA CARNEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUANNA MAIA CARNEIRO
DATA : 17/04/2020
HORA: 14:00
LOCAL: Defesa remota (devido à pandemia de COVID-19)
TÍTULO:

CHEMICAL ELEMENTS IN SEDIMENTS OF THE SERINHAEM ESTUARY, ENVIRONMENTAL PROTECTION AREA OF PRATIGI, BAHIA

PALAVRAS-CHAVES:

chemical elements, core, sediment, Serinhaem River Estuary, Pratigi-Bahia Environmental Protection Area, origin of organic matter

PÁGINAS: 61
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

The present study characterized the elemental and isotopic ratios of COT, N, δ¹³C, δ¹⁵N and C / N and the concentrations of the chemical elements Al, As, Ba, Co, Cr, Cu, Fe, Mn, Ni, Pb, V and Zn in five sediment cores collected along the Serinhaem River estuary, Bahia, Pratigi-Bahia Environmental Protection Area, with the objective of investigating the origin of organic matter and verifying the influence of depth and location on the distribution of geochemical variables along the estuary. The δ¹³C values found in the mangrove are characteristic of terrestrial sources, as well as the δ¹⁵N values, thus remaining throughout the Serinhaem River estuary. The C/N ratio also confirmed the data found by δ¹³C and δ¹⁵N, indicating that the origin of organic matter is of terrestrial origin, precisely from plants with a C3 type photosynthetic pattern. In T1 and T2, the highest C/N values were found, which can be justified by high concentrations of TOC or decrease in N. Allied to this, these testimonies were collected near the city of Ituberá, and there may have been some punctual event. Fe, Al and Mn were found in large quantities due to the composition of the basin to which the study area belongs and most elements had a significant correlation with Fe, Al and Mn, which may have the same origin or be associated Fe and Mn oxy-hydroxides, as well as aluminosilicates. Although Cr, As and V are correlated with Fe, Mn and Al, their concentrations are above those established by NOAA, suggesting adverse effects on biota. The concentrations of Bário grew towards the mouth, where it meets the Camamu Bay, which is naturally enriched with this element. Allied to this, it was possible to observe that along the vertical profile, the variations in the concentrations of the elements and variables were not high, while along the estuary, it was possible to verify that the cores differ from each other. When comparing the results found with values established by CONAMA and with areas little altered by anthropogenic activities, the Serinhaem River estuary can be considered relatively little influenced by human activities. The results obtained will serve as a base line for future environmental studies in the Serinhaem River estuary and for monitoring it, since no study has been carried out so far to investigate the origin of organic matter and the behavior of chemical elements in cores.

MEMBROS DA BANCA:
Externo à Instituição - CARLOS EDUARDO VEIGA DE CARVALHO - UENF
Presidente - 1522392 - GISELE MARA HADLICH
Interno - 2349838 - MARIA DO ROSARIO ZUCCHI
Externo à Instituição - TAISE BOMFIM DE JESUS - UEFS