title: Determination of the total iron content of used lubricating oils by atomic-absorption with use of emulsions.
abstract: A new method is proposed for the determination of the total iron content of used lubricating oils. It is based on treatment of the samples with a mixture of hydrofluoric and nitric acids (without destruction of the organic matter) and emulsification, followed by atomic-absorption measurement. This allows the use of aqueous standards and provides a simple, rapid, inexpensive and accurate method, that is not affected by the particle size of the solids in the oil.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, Valencia, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Salvador
authors.forename: M
authors.initials: M
authors.lastname: de la Guardia
authors.forename: V
authors.initials: V
authors.lastname: Berenguer