Banca de DEFESA: AMANDA SANTOS SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : AMANDA SANTOS SILVA
DATA : 28/09/2017
HORA: 09:00
LOCAL: Instituto de Geociências (IGEO) da Universidade Federal da Bahia (UFBA)
TÍTULO:

EVALUATION OF TIME DISTRIBUTION BY INORGANIC CONTAMINANTS IN NORTHERN AND NORTHEAST OF TODOS OS SANTOS BAY (BAHIA - BRAZIL)

PALAVRAS-CHAVES:

Todos os Santos Bay; trace-metals; core

PÁGINAS: 61
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
SUBÁREA: Geologia
ESPECIALIDADE: Geologia Ambiental
RESUMO:

The high rate of urbanization around the Todos os Santos Bay (BTS), the industrial development and the absence and / or inadequate treatment system of domestic effluents has caused the degradation of the ecosystems of the region. This work aimed to evaluate the temporal variation of the concentration of metals and arsenic in the northeast region of the Todos os Santos Bay (Brazil). Four sediment cores were collected at the study site. The analyzed elements were arsenic (As), cobalt (Co), chromium (Cr), copper (Cu), manganese (Mn), nickel (Ni), lead (Pb), vânadio (V) and zinc (Zn). These analyzes were done through an inductively coupled plasma mass spectrometer. The granulometry, total organic carbon (TOC), δ 13C (‰) and δ15N (‰) of the samples were also evaluated. The date of the sediment cores was made through the analysis of Pb210. Sedimentation rates ranged from 0.60 to 0.96 cm year-1 . The four cores analyzed presented predominance of lamoso sediment. It was possible to observe an increase in TOC over the years, with T2 and T3 being significant since 1990. The organic matter in BTS is predominantly marine. However, there were quantitative and qualitative changes of the organic matter deposited in the Northeast region of the BTS, mainly caused by the anthropic activities developed in the region. The average values of the concentration of most of the metals analyzed were close to previous studies performed in the region. It was possible to observe a tendency for the increase in the content of metals over the years, with the highest concentrations occurring from 1963. This period coincides with the growth of industrial activities and disordered urban. There is no temporal and spatial pattern in the distribution of metals. A higher temporal variation of the elements was observed for T4, mainly for the metals Cr and Cu. The strong correlation (p<0,5) between metals indicates that these elements have common origin.

MEMBROS DA BANCA:
Presidente - 2322888 - OLIVIA MARIA CORDEIRO DE OLIVEIRA
Interno - 2564483 - JOSE ANGELO SEBASTIAO ARAUJO DOS ANJOS
Externo ao Programa - 6285989 - ANTONIO FERNANDO DE SOUZA QUEIROZ
Externa à Instituição - ILENE MATANÓ ABREU - UFBA
Externa à Instituição - RITA MARIA WESTE NANO CARVALHO - IFBA