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This method is for the determination of trace amounts (µg/kg) of copper, iron, and nickel. The method requires the vaporization of the oil or fat in a suitable graphite furnace connected to an atomic absorption spectrometer (previously calibrated using standard solutions of organocompounds of copper, iron, and nickel), followed by the measurement of the metal content from the observed absorptions at selected wavelengths. The elements are analyzed sequentially (see References, 1 and 2). Applicable to the determination of copper, iron, and nickel in all types of crude or refined oils and fats, including contaminants from bleaching earth and/or catalysts. This method is equivalent to International Union of Pure and Applied Chemistry standard method 2.631 (References,1 and 2).