Banca de DEFESA: CASSIO COSTA LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CASSIO COSTA LIMA
DATE: 02/04/2024
TIME: 08:15
LOCAL: Defesa digital
TITLE:

Human health risk assessment in surface soils in the city of Santo Amaro da Purificação, Bahia, Brazil

KEY WORDS:

Santo Amaro da Purificação, Lead smelting plant, Principal Component Analysis (PCA), Contamination Factor (CF), Ecological risk;

PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Analítica
SPECIALTY: Análise de Traços e Química Ambiental
SUMMARY:

Santo Amaro da Purificação is a city in Bahia, approximately 80 kilometers from Salvador. Over the last few decades, it has faced problems of contamination by toxic metals from the waste (scoria) generated by mining activities, which has generated significant environmental liabilities and negatively affected the population. The smelting plant, which operated in this town from 1960 to 1993, was shut down after causing deaths and irreversible adverse effects on the population's health due to contamination by lead and other elements. Twenty-eight surface soil samples were collected in the urban domain of Santo Amaro, Brazil, to assess the risks associated with metal contamination in soil. In this context, lead, cadmium, arsenic, chromium, copper, and zinc, six of the seven elements recommended by Hakanson in 1980 for ecological risk assessment, were determined using inductively coupled plasma-optical emission spectrometry (ICP OES). The following concentration ranges in µg g-1 was found for the analytes As (1,10 to 75,80), Cr (8,48 to 247,00), Cu (8,44 to 245,85), Cd (1,07 to 90,57), Pb (4,65 to 12415,72) and Zn (17,07 to 3511,16). The contamination factor (CF), ecological risk index (Er), pollutant load index (PLI), degree of contamination (mCdeg), and potential ecological risk index (PERI) were used to investigate the level of contamination and ecological risk of the samples. The CF index showed that the samples collected inside the foundry had high contamination by lead, cadmium, and zinc, low contamination by chromium, and low to moderate contamination by arsenic and copper. In addition, the integrated PLI index showed that all the samples collected inside the foundry had high pollution; however, of the other twenty-two samples investigated, only two showed pollution. The ecological risk index showed that soil samples collected from homes near the smelter posed an ecological risk due to cadmium contamination. The PERI showed that samples collected on the city's access road and those collected on streets close to the foundry showed low ecological risk. The results obtained by applying principal component analysis (PCA) and hierarchical cluster analysis (HCA) to the data relating to the levels of chemical elements in the soil samples fully corroborate the results found using the toxicological assessment indices

COMMITTEE MEMBERS:
Interno - 268481 - SERGIO LUIS COSTA FERREIRA
Interno - 1068075 - JORGE MAURICIO DAVID
Interna - 2721446 - DANIELE CRISTINA MUNIZ BATISTA DOS SANTOS
Externo ao Programa - 2564483 - JOSE ANGELO SEBASTIAO ARAUJO DOS ANJOS - UFBAExterno à Instituição - ERIK GALVÃO PARANHOS DA SILVA - UESC-BA