REFERENCES
- Adebiyi , F. M. , Oluyemi , E. A. and Peter , S. V. 2011 . The study of the environmental implications of used lubricating oils by a combination of spectrometric analytical techniques . Energy Sources, Part A , 33 : 459 – 466 .
- Davies , I. J. T. 1972 . The clinical significance of the essential biological metals , London , , England : Heinemann Medical Books .
- Hadjiioannou , T. P. , Christain , G. D. , Efstathiou , C. E. and Nikolelis , D. P. 1988 . Problem solving in analytical chemistry (1st ed.) , New York , NY : Pergamon Press .
- Howard , H. A. 2002 . “ Human health and heavy metals exposure ” . In Life Support: The Environment and Human Health , Edited by: McCally , M. Cambridge , MA : MIT Press .
- Hyne , N. J. 2001 . Nontechnical guide to petroleum geology: Exploration, drilling, and production , Fair Lawn , NJ : PennWell .
- Kalnes , T. N. , Youtsey , K. J. , James , R. B. and Hedden , D. R. 1989 . Recycling waste oils for profit (UOP Direct hydrogenation process) . Hazard. Waste Hazard Mater. , 6 : 51 – 66 .
- Klamman , D. 1984 . Lubricants and related products (2nd ed.) , Madison , WI : Verlag Chemie .
- Laxen , D. P. H. and Harrison , R. M. 1981 . Cleaning methods for polythene containers prior to determination of trace metals in fresh water samples . Anal. Chem. , 53 : 345 – 530 .
- Norman , M. T. 1980 . Environmental and health , Ann Arbor , MI : Butterworth .
- Shuman , L. M. 1999 . Organic waste amendments effect on zinc fraction of two soils . J. Environ. Qual. , 28 : 1442 – 1447 .
- Speight , J. G. 1999 . The chemistry and technology of petroleum , New York , NY : Marcel Dekker .
- Stubbs, Overbeck, & Associates . 1980 . Engineering design of a solvent treatment/distillation used lubricating oil re-refinery (4th ed.) , New York , NY : U.S. Department of Energy Publications .
- Trevor , M. 1981 . Atomic absorption spectrophotometry for the analysis of wear metals in oil samples , Palo Alto , CA : Varian Instruments .
- Wikipedia . 2010 . Motor oil Retrieved from http://en.wikipedia.org/wiki/Motor_oil
- Woydt , M. 1999 . Operating fluid for lifetime lubricated internal combustion engines Available at: http://www.uspto.gov
- Yen , T. F. 1975 . The role of trace metals in petroleum , Ann Arbor , MI : Butterworth .
- Zaykina , R. F. and Zaykin , Y. A. 2002 . Radiation technologies for production and regeneration of motor fuel and lubricants . Radiat. Phys. Chem. , 65 : 169 – 172 .