Potentiometric stripping analysis for simultaneous determination of copper and lead in lubricating oils after total digestion in a focused microwave-assisted oven - Munõz, Rodrigo Alejandro Abarza; Silva, Cíntia S.; Correia, Paulo Rogerio Miranda; Oliveira, Pedro Vitoriano de; Angnes, Lúcio (Microchimica Acta, 2005)