Banca de DEFESA: JOÃO MANOEL DE LIMA JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JOÃO MANOEL DE LIMA JÚNIOR
DATA : 12/02/2020
HORA: 13:00
LOCAL: sala 303, 3º andar, Bloco B, Campus SA da Fundação Universidade Federal do ABC, localizada na Avenida dos Estados, 5001, Santa Terezinha, Santo André, SP
TÍTULO:

Application of graphene oxide in the dispersive solid phase microextraction aiming the preconcentration in liquid samples 

PÁGINAS: 109
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Análise de Traços e Química Ambiental
RESUMO:

Separation and preconcentration procedures are often required for the elimination of interferents, increased sensitivity and improved detection limits. To simplify the extraction process and reduce the consumption of reagents and samples, dispersive solid phase microextraction (D-m-SPE) has been used. This type of microextraction originated from dispersive liquid-liquid microextraction (DLLME) and is based on the efficient introduction of a reduced amount of solid phase into a liquid sample. Graphene oxide, due to its large surface area, among other desirable characteristics, has found application in the extraction of metals. The present work had as main objective the use of D-m-SPE in the development of an analytical method for the simultaneous determination of the metals Ca, Al, Cu, Fe, Mn, Zn, Ti, Cd, Ni and Cr, present in liquid samples. Taking full advantage of Dm-SPE, the specific objectives are: (i) to propose the use of graphene oxide as a solid phase and (ii) to exploit the advantages of Dm-SPE combined with Laser Induced Breakdown Spectroscopy metal detection (LIBS). With the developed methodology, where graphene oxide after metal extraction was immobilized on agarose films and cellulose ester membranes, it was possible to obtain calibration curves with linear ranges between 100 and 700 µg L^-1 using cellulose ester membranes. and between 100 and 500 µg L^-1 using agarose films. Agarose, LOD and LOQ films between 0,3 and 23 µg L^-1 and 1 and 77 µg L^-1, respectively, were calculated. For cellulose ester membranes, LOD and LOQ were calculated between 0,7 and 24 µg L^-1 and 2 and 27 µg L^-1, respectively, however, 100 µg L^-1 experimental LOQs were adopted. The method was applied to samples of reuse water, groundwater and reference materials: Drinking water (EP-H), Ground water (ES-L) and Waste water (EU-L).

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1543683 - IVANISE GAUBEUR
Membro Titular - Examinador(a) Externo à Instituição - FABIO RODRIGO PIOVEZANI ROCHA
Membro Titular - Examinador(a) Externo à Instituição - JULIANA NAOZUKA - UNIFESP
Membro Suplente - Examinador(a) Externo à Instituição - CASSIANA SEIMI NOMURA - USP
Membro Suplente - Examinador(a) Externo à Instituição - FLAVIO DE OLIVEIRA LEME - UFABC