Banca de DEFESA: RAFAEL FRANCO DE JESUS
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.DISCENTE : RAFAEL FRANCO DE JESUS
DATA : 16/11/2020
HORA: 09:00
LOCAL: Instituto de Química
TÍTULO:
USE OF POLYMERS WITH PRINTED IONS FOR PRE-CONCENTRATION AND DETERMINATION OF CADMIO AND LEAD IN ALCOHOLIC BEVERAGES
PALAVRAS-CHAVES:
CADMIUM, LEAD, POLYMERS WITH PRINTED IONS, ALCOHOLIC BEVERAGES, FAAS.
PÁGINAS: 70
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Análise de Traços e Química Ambiental
RESUMO:
Wine and beer are alcoholic beverages widely consumed in Brazil and worldwide. Due to their popularity it is important to know their composition, especially the determination of potentially toxic metals. In this perspective, analytical strategies aimed at determining contaminants in these matrices are opportune. In this work, two polymers with printed ions (IIP) were synthesized and used in a pre-concentration system to determine cadmium and lead in samples of alcoholic beverages. The synthesized IIPs contained the impression of Cd (II) and Pb (II) ions, where the "bulk" polymerization process was employed. These sorbents were used in a pre-concentration column and the metals were detected by flame atomic absorption spectrometry (FAAS). The optimal conditions of use of the column were obtained through multivariate techniques of experimental designs. The system allows the determination with detection and quantification limits of 1.0 and 3.5 µg L-1 for cadmium and 23.5 and 80.0 µg L-1 for lead, respectively. The linearity observed for cadmium was 3.5 to 500 µg L-1 and for lead 5.4 to 2000 µg L-1, with correlation coefficients (R²) of 0.9980 and 0.99991 for cadmium and lead, respectively. The proposed procedure was applied to determine cadmium and lead in samples of wines and beers.
MEMBROS DA BANCA:
Presidente - 268481 - SERGIO LUIS COSTA FERREIRA
Interno - 286034 - ANA MARIA PINTO DOS SANTOS
Interno - 318.201.155-34 - WALTER NEI LOPES DOS SANTOS - UFBA
Externo ao Programa - 1553300 - ANDERSON SANTOS SOUZA
Externo à Instituição - KARINA SANTOS GARCIA - UFBA