Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy

Graphite Furnace Atomic Absorption Spectroscopy (GF-AAS) technique had been widely used for the determination of trace metals because of its high sensitivity. However, when this technique is applied for metals in organic samples such as crude oil, inconsistent reading were obtained due to smoke prod...

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Main Author:	Kamarudin, Nurul Hanis
Format:	Thesis
Language:	English
Published:	2013
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/32341/5/NurulHanisKamarudiinMFS2013.pdf
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spelling	my-utm-ep.323412017-09-12T06:54:58Z Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy 2013-01 Kamarudin, Nurul Hanis Q Science (General) Graphite Furnace Atomic Absorption Spectroscopy (GF-AAS) technique had been widely used for the determination of trace metals because of its high sensitivity. However, when this technique is applied for metals in organic samples such as crude oil, inconsistent reading were obtained due to smoke produced during the heating program which in turn interfere light absorption by the analyte. As such, organic components of the crude must first be removed to obtain a more accurate analysis of the metal analyte. This study evaluates the use of different acid combinations such as H2SO4/HNO3/H2O2, HCl/HNO3, HNO3/H2O2, H2SO4/HNO3 and H2SO4/HNO3/HCl for the decomposition of crude oil for the determination of nickel, chromium and vanadium. First, the temperature for GF-AAS analysis was optimized. The optimum drying, pyrolysis and atomization temperature for Ni were 110, 1000, and 2600 oC, while for vanadium were 110, 1100 and 2650 oC, and for Cr were 110, 1650 and 2500 oC respectively. The results show that vanadium concentrations in crude oil were 10.60±4.28 µg/g, 32.95±10.00 µg/g and 26.31±10.90 µg/g after being digested using H2SO4/HNO3/H2O2, H2SO4/HNO3/HCl and H2SO4/HNO3 respectively.. The concentration of nickel using the acid combination of H2SO4/HNO3/HCl, H2SO4/HNO3 and HNO3/H2O2 are 35.27±2.40 µg/g, 12.35±7.19 µg/g and 37.61±0.85 µg/g respectively. The chromium concentrations are 47.26±3.38 µg/g, 4.46±4.76 µg/g and 6.04±4.73 µg/g for the acid combination of H2SO4/HNO3/HCl, H2SO4/HNO3 and HNO3/H2O2, Good recovery was obtained only for vanadium digested with H2SO4/HNO3/H2O2 with an average of 94.95±13.73 %. 2013-01 Thesis http://eprints.utm.my/id/eprint/32341/ http://eprints.utm.my/id/eprint/32341/5/NurulHanisKamarudiinMFS2013.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Kamarudin, Nurul Hanis Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy
description	Graphite Furnace Atomic Absorption Spectroscopy (GF-AAS) technique had been widely used for the determination of trace metals because of its high sensitivity. However, when this technique is applied for metals in organic samples such as crude oil, inconsistent reading were obtained due to smoke produced during the heating program which in turn interfere light absorption by the analyte. As such, organic components of the crude must first be removed to obtain a more accurate analysis of the metal analyte. This study evaluates the use of different acid combinations such as H2SO4/HNO3/H2O2, HCl/HNO3, HNO3/H2O2, H2SO4/HNO3 and H2SO4/HNO3/HCl for the decomposition of crude oil for the determination of nickel, chromium and vanadium. First, the temperature for GF-AAS analysis was optimized. The optimum drying, pyrolysis and atomization temperature for Ni were 110, 1000, and 2600 oC, while for vanadium were 110, 1100 and 2650 oC, and for Cr were 110, 1650 and 2500 oC respectively. The results show that vanadium concentrations in crude oil were 10.60±4.28 µg/g, 32.95±10.00 µg/g and 26.31±10.90 µg/g after being digested using H2SO4/HNO3/H2O2, H2SO4/HNO3/HCl and H2SO4/HNO3 respectively.. The concentration of nickel using the acid combination of H2SO4/HNO3/HCl, H2SO4/HNO3 and HNO3/H2O2 are 35.27±2.40 µg/g, 12.35±7.19 µg/g and 37.61±0.85 µg/g respectively. The chromium concentrations are 47.26±3.38 µg/g, 4.46±4.76 µg/g and 6.04±4.73 µg/g for the acid combination of H2SO4/HNO3/HCl, H2SO4/HNO3 and HNO3/H2O2, Good recovery was obtained only for vanadium digested with H2SO4/HNO3/H2O2 with an average of 94.95±13.73 %.
format	Thesis
qualification_level	Master's degree
author	Kamarudin, Nurul Hanis
author_facet	Kamarudin, Nurul Hanis
author_sort	Kamarudin, Nurul Hanis
title	Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy
title_short	Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy
title_full	Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy
title_fullStr	Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy
title_full_unstemmed	Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy
title_sort	optimization of chromium, nickel and vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2013
url	http://eprints.utm.my/id/eprint/32341/5/NurulHanisKamarudiinMFS2013.pdf
_version_	1747815979387191296

Optimization of Chromium, Nickel and Vanadium analysis in crude oil using graphite furnace atomic absorption spectroscopy

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