Physico-chemical and Concentration of Heavy Metals Analyses in Virgin and Used Lubricating Oils: A Spectroscopy Study Author/Editor(s): Boadu, Kwasi Opoku Joel, Ogbonna Friday Essumang, David KofiEvbuomwan, Benson OsaDate of publication: 2019Other Papers, Posters and Presentations Read more about Physico-chemical and Concentration of Heavy Metals Analyses in Virgin and Used Lubricating Oils: A Spectroscopy Study