Banca de DEFESA: IZABEL KALINE DA SILVA OLIVEIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : IZABEL KALINE DA SILVA OLIVEIRA
DATA : 28/07/2017
HORA: 09:00
LOCAL: Auditório do NUPPRAR/UFRN
TÍTULO:

Development of a method for the determination of chlorine in oil via MgCl molecule by HR-CS MAS

PALAVRAS-CHAVES:

Chlorine, petroleum, emulsion, molecule MgCl, HR-CS MAS

PÁGINAS: 77
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

A methodology for the determination of chlorine in petroleum samples prepared by emulsions was developed by high resolution molecular absorption spectrometry with continuum source through the diatomic molecule MgCl, in the wavelength 377.01 nm. The preparation of the emulsion was optimized through centroid-simplex design. The conditions of preparation of the emulsions were: 0.5 mL of 5% (v / v) HNO3, 0.5 mL of xylene and 2 mL of a mixture of n-Propanol / Triton X-100 solvents in the ratio 5:1. The crude oil mass used was about 0.20 g. Magnesium was used as the precursor of the molecule, the optimized concentration was 10 g L-1. The proportional studies between Mg and Cl for the formation of molecules show that to ensure the formation of a MgCl molecule is required for a mass ratio of at least 500 Mg: 1 Cl. A mass of 5 μg of Pd was introduced at each cycle that chemical modifier for increase the thermal stability of the molecular species. The optimized pyrolysis and vaporization temperatures were 800 ° C and 2300 ° C, respectively. For chlorine analysis, eight crude oil samples from the Potiguar Basin and two certified reference materials, lubricated oil (NIST 1848) and fuel oil (NIST 1634c) were used, to verify the accuracy of the method. The calibration strategy against aqueous standards was possible, obtaining the LOD of 5 mg kg-1. Addition / recovery tests were performed and the values obtained were between 92 and 117%, values acceptable analytically

MEMBROS DA BANCA:
Presidente - 348475 - DJALMA RIBEIRO DA SILVA
Externo à Instituição - EMILY CINTIA TOSSI DE ARAUJO COSTA - UFRN
Externo ao Programa - 1412709 - NEDJA SUELY FERNANDES
Externo à Instituição - SUELY SOUZA LEAL DE CASTRO - UERN
Externo à Instituição - TATIANE DE ANDRADE MARANHAO - UFSC
Interno - 347057 - TEREZA NEUMA DE CASTRO DANTAS