Determination of the total iron content of used lubricating oils by atomic-absorption with use of emulsions.
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.
Salvador
A
A
Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, Valencia, Spain.
de la Guardia
M
M
Berenguer
V
V