Moreover, this technique has a relatively high cost for routine analysis. Despite presenting low sensitivity and mono-elementary characteristic, flame atomic absorption spectrometry (F AAS) continues to be an important technique for the determination of metals in lubricating oils. This is due to its low cost and robustness in relation to the tolerance of flames for most organic solvents. With regard to graphite furnace atomic absorption spectrometry (GF AAS), the number of applications is smaller probably due to the mono-elementary characteristics and the low sample consumption—that could lead to problems of non-representativeness.