Determination of wear metals in lubricating oils by flame atomic absorption spectrophotometry |
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Authors: | W Yawar |
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Institution: | (1) Alliance for Research on North Africa (ARENA), Graduate School of Life and Environmental Sciences, University of Tsukuba, Japan;(2) Centre of Biotechnology, Ministry of Scientific Research Technology and Competency Development, Tunisia; |
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Abstract: | A simple, rapid and reliable method was developed for the determination of copper, nickel, iron and lead in fresh and used
lubricating oil samples by flame atomic absorption spectrophotometry (FAAS). In the present study, a mixture of organic solvents containing propionic acid and iso-butylmethyl ketone (1: 1) was used to extract the metals from lubricating oil samples followed by FAAS analysis. Aqueous
standard solutions can be easily employed with the proposed mixed solvent system instead of organometallic standards. The
analytical results obtained by employing the proposed solvent extraction system were found to be in good agreement with the
results for aqueous media obtained after the destruction of oil samples matrix. Percentage recovery studies showed 88–98%
for Cu, 92–95% for Fe, 96–106% for Ni and 84–100% for Pb with relative standard deviation of 2–6%. The developed method was
effectively applied to routine determination of Cu, Ni, Fe, and Pb in lubricating oil samples. |
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