Determination of the Distribution Patterns and Abundances of Trace Elements in Nigerian Crude Oil Using the AAS Technique

Abstract:

Crude oil samples from four oil wells in Nigeria were analyzed for the following seven trace elements: V, Cr, Mn, Fe, Co, Ni and Pb using Atomic Absorption Spectrometric (AAS) analytical technique. The mean concentrations of these elements on a weight to weight basis were found to range from 0.017 ± 0.005 to 1.977 ± 0.397ppm. The results also show that V was the most abundant metal with Ovia 1 Long String (OLS) Oil well containing the highest concentration of V. The V/Ni ratio from the method used shows that Ovia 1 Long String (OLS) and Ovia 1 Short String (OSS) were the most and the least matured oil wells respectively. All the samples had comparably the same V/Ni ratio (1.16—1.77) implying identical source for all the oils. Furthermore, the calculated values of American Petroleum Institute (°API) gravity determined using the measurement of specific gravity (S.G.) of the crude oil samples range from 47.80 to 55.50. This suggests that the samples fall into one category of crude oil classification which in this case is light crude.

• Periodical: International Journal of Engineering Research in Africa (Volume 5)
• Pages: 64-73
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.5.64
• Online since: July 2011
• Authors: O.D. Nworgu, O.D. Osahon
• Keywords: Atomic Absorption Spectrometry, Concentration, Crude Oil, Petroleum, Trace Elements

References

[1] R. A. Nadkarni, A review of modern instrumental methods of elemental analysis of petroleum related material, ASTM STP, 1109 (1991) 19P.

[2] J. F. Davies, Crude oil in modern petroleum technology Volume 2 Downstream, 6th ed., John Wiley and Sons Ltd, New York (2000).

[3] A. D. Richard, Fundamentals of exploration and production, modern petroleum technology Volume 1 Upstream, 6th ed, John Wiley and Sons Ltd, New York (2000).

[4] A. Treibs, Chlorophyll und Haminderivate in Organischen Mineralstoffen, Angew. Chem. 49, (1936) 682-686.

DOI: 10.1002/ange.19360493803

[5] J. M. Hunt, Petroleum Geochemistry and Geology, 2nd ed. Pub, by W.H. Freeman and Company' USA (1996).

[6] B. Wely and M. Sperling, Atomic Absorption Spectrometry, 3rd ed, Wiley VCH Weinheim Germany (1999).

[7] F. E. Asuquo, F. N. Morah, A. E. Nya and M. E. Ehrhardt, Trace elements in crude oils and beach tars from Nigerian coastline, Indian Journal of Marine Sciences, 24: (1995) 16 – 18.

[8] M. M. Musa, W. W. Markus, A. A. Elghondi, R. H. Etwir, A. H. Hannan and E. A. Arafa, Neutron activation analysis of major and trace elements in crude petroleum. Journal of Radioanalytical and Nuclear Chemistry, 198 (1) (1995) 17-22.

DOI: 10.1007/bf02038241

[9] I. O. Akpan, E. J. Uwah and F. A. N. Osadebe , Application of Total Reflection X-ray Fluorescence (TXRF) technique for elemental analysis of Nigerian crude oils, Nigerian Journal of Physics Vol. 17; (2005) 103-107.

DOI: 10.4314/njphy.v17i1.38000

[10] D. J. Adeyemo, I. M. Umar, S. A. Jonah, S. A. Thomas, F. B. Agbaji and E. H. K. Akaho, Trace elemental analysis of Nigerian crude oils by Instrumental Neutron Activation Analysis (INAA) using miniature neutron source reactor, Journal of Radioanalytical and Nuclear Chemistry, Vol. 261, No. 1, (2004).

DOI: 10.1023/b:jrnc.0000030963.08444.fd

[11] C. Duyck, N. Miekeley, C. L. Porto da Silveira, R. Q. Aucélio, R. C. Campos, P. Grinberg and G. P. Brandäo, The determination of trace elements in crude oil and its heavy fractions by atomic spectrometry, Spectrochimica Acta Part B: Atomic Spectroscopy Vol. 62 (9) (2007).

DOI: 10.1016/j.sab.2007.04.013

[12] J. S. Becker, Trace and ultra trace analysis in liquids by Atomic Spectrometry, TrAC Trends in Analytical Chemistry Vol. 24 (3) (2005) 243 – 254.

DOI: 10.1016/j.trac.2004.12.003

[13] F. A. C. Amorim, B. Welz, A. C. S. Costa, F. G. Lepri, M. G. R. Vale and S. L. C. Ferreira, Determination of vanadium in petroleum and petroleum products using atomic spectrometric techniques, Talanta Vol. 72 (2) (2007) 349 359.

DOI: 10.1016/j.talanta.2006.12.015

[14] R. M. de Souza, A. L. S. Meliande, C. L. P. da Silverira and R. Q. Aucéllo, Determination of Mo, Zn, Cd, Ti, Ni, V, Fe, Mn, Cr and Co in crude oil using Inductively Coupled Plasma Optical Emission Spectrometry (ICP – OES) and sample introduction as detergentless microemulsion, Microchemical Journal Vol. 82 (2) (2006).

DOI: 10.1016/j.microc.2006.01.005

[15] F. R. S. Bertin, D. Pozebon, P. A. Mello and E. M. M. Flores, Determination of trace elements in paints by direct sampling graphite furnace atomic absorption spectrometry, Analytica Chimica Acta Vol. 602 (1) (2007) 23 – 31.

DOI: 10.1016/j.aca.2007.09.003

[16] J. S. F. Pereira, D. P. Moraes, F. G. Antes, L. O. Diehi, M. F. P. Santos, R. C. L. Guimaräes, T. C. O. Fonseca, V. L. Dressler and E. M. M. Flores, Determination of metals and metalloids in light and heavy crude oil by Inductively Coupled Plasma Mass Spectrometry (ICP – MS) after digestion by microwave induced combustion, Microchemical Journal 96 (1) (2010).

DOI: 10.1016/j.microc.2009.12.016

[17] S. C. Malcolm, Flame spectrometry in environmental chemical analysis: A practical guide, The Royal Society of Chemistry U.K. (1994).

[18] M. Trevor, Atomic Absorption Spectrophotometry for the analysis of wear metals in oil samples, Varian instruments at work. Varian techtron Pty, Ltd, Muigrave, Victoria, Australia (1981).

[19] A. Cecarini, I. Ceccini and R. Fuoco, Determination of trace elements in sea water samples by on – line column extraction / graphite furnace atomic absorption spectrometry, In Microchemical Journal 79 (1 – 2): (2005) 21 – 24.

DOI: 10.1016/j.microc.2004.10.020

[20] C.M. A. Ademoroti, Environmental Chemistry and Toxicology. Foludex Press Ltd Ibadan, Nigeria (1996).

[21] G. W. Hodgson, Vanadium, Nickel and iron trace metals in crude oils of Western Canada, American Association of Petroleum Geologists Bulletin Vol. 38: (1954) 2537 – 2554.

DOI: 10.1306/5ceae0c4-16bb-11d7-8645000102c1865d

[22] O. T. Udo, S. Ekwere and S. Abrakasa, Some trace metals in selected Niger Delta crude oil: Application in oil – oil correlation studies, J. Min. Geol. 28 (2) (1992) 289 – 291.