1. Audibert, F., "Waste engine oils: Rerefining and energy
recovery, Elsevier, (2011).
2. Cutler, E., "Conserve lube oil: Re-refine.[propane-vacuumhydrogen
process]", Hydrocarbon Process.;(United States),
Vol. 55, No. 5, (1976).
3. Cerny, J., Strnad, Z. and Sebor, G., "Composition and
oxidation stability of sae 15w-40 engine oils", Tribology
International, Vol. 34, No. 2, (2001), 127-134.
4. Ofodu, J. and Anosike, C., "Variation in rheological properties
of engine oil with usage", Global Journal of Engineering
Research, Vol. 2, No. 1, (2003), 95-100.
5. Osman, D.I., Attia, S.K. and Taman, A.R., "Recycling of used
engine oil by different solvent", Egyptian Journal of
Petroleum, Vol. 27, No. 2, (2018), 221-225.
6. Oladimeji, T.E., Sonibare, J.A., Omoleye, J.A., Adegbola, A.A.
and Okagbue, H.I., "Data on the treatment of used lubricating
oil from two different sources using solvent extraction and
adsorption", Data in Brief, Vol. 19, (2018), 2240-2252.
7. Elbashir, N., Al-Zahrani, S., Mutalib, M.A. and Abasaeed, A.,
"A method of predicting effective solvent extraction parameters
for recycling of used lubricating oils", Chemical Engineering
and Processing: Process Intensification, Vol. 41, No. 9,
(2002), 765-769.
8. Abu-Elella, R., Ossman, M., Farouq, R. and Abd-Elfatah, M.,
"Used motor oil treatment: Turning waste oil into valuable
products", International Journal of Chemical and
Biochemical Sciences, Vol. 7, No. 2015, (2015), 57-67.
9. Shakir, A.O. and Ali, H.A.A.-R., "The effect of lining material
on the permeability of clayey soil", Civil Engineering Journal,
Vol. 5, No. 3, (2019), 662-678.
10. Taha, K.K., Suleiman, T.M. and Musa, M.A., "Performance of
sudanese activated bentonite in bleaching cotton seed oil",
Bangladesh Chemistry Society, Vol. 24, No. 2, (2011), 191201.
11. Khan, M., Almesfer, M., Danish, M., Ali, I., Shoukry, H.,
Patel, R., Gardy, J., Nizami, A. and Rehan, M., "Potential of
saudi natural clay as an effective adsorbent in heavy metals
removal from wastewater", Desalination and Water
Treatment, Vol., No., (2019), 140-151.
12. Isah, A., Abdulkadir, M., Onifade, K., Musa, U., Garba, M.,
Bawa, A. and Sani, Y., "Regeneration of used engine oil", in
Proceedings of the World Congress on Engineering. Vol. 1,
(2013), 54-76.
13. Sabour, M.R. and Shahi, M., "Spent bleaching earth recovery
of used motor-oil refinery", Civil Engineering Journal, Vol.
4, No. 3, (2018), 572-584.
14. Mohammed, R.R., Ibrahim, I.A., Taha, A.H. and McKay, G.,
"Waste lubricating oil treatment by extraction and adsorption",
Chemical Engineering Journal, Vol. 220, (2013), 343-351.
15. Udonne, J.D., "A comparative study of recycling of used
lubrication oils using distillation, acid and activated charcoal
with clay methods", Journal of Petroleum and Gas
Engineering, Vol. 2, No. 2, (2011), 12-19.
16. Rahman, M., Siddiquee, T., Samdani, S. and Kabir, K., "Effect
of operating variables on regeneration of base-oil from waste
oil by conventional acid-clay method", Chemical Engineering
Research Bulletin, Vol. 12, No. 1, (2008), 24-27.
17. Hamad, A., Al-Zubaidy, E. and Fayed, M.E., "Used lubricating
oil recycling using hydrocarbon solvents", Journal of
Environmental Management, Vol. 74, No. 2, (2005), 153159.
18. Assunção Filho, J., Moura, L. and Ramos, A., "Liquid-liquid
extraction and adsorption on solid surfaces applied to used
lubricant oils recovery", Brazilian Journal of Chemical
Engineering, Vol. 27, No. 4, (2010), 687-697.
19. Aziz, B.K., Abdullah, M.A. and Jubrael, K.J., "Acid activation
and bleaching capacity of some clays for decolourizing used
oils", Asian Journal of Chemistry, Vol. 23, No. 6, (2011),
2449.
20. D, A., "Standard test method for astm color of petroleum
products (astm color scale)", Annual Book of Standards,
(2007).
21. Owen, A., "Fundamentals of uv-visible spectroscopy", (1996).
22. Kostin, A., Mostalygina, L. and Bukhtoyarov, O., "The
mechanism of adsorption of zinc and cadmium ions onto
bentonite clay", Protection of Metals and Physical Chemistry
of Surfaces, Vol. 51, No. 5, (2015), 773-778.
23. Attia, K.A.M., Elabasawy, N.M. and Abolmagd, E.,
"Simultaneous equation and area under the curve
spectrophotometric methods for estimation of cefaclor in
presence of its acid induced degradation product; a
comparative study", Future Journal of Pharmaceutical
Sciences, Vol. 3, No. 2, (2017), 163-167.
24. Rele, R.V. and Tiwatane, P.P., "Uv spectrophotometric
estimation of carvedilol hydrochloride by second order
derivative methods in bulk and pharmaceutical dosage form",
Research Journal of Pharmacy and Technology, Vol. 7, No.
12, (2014), 9.