2.3. Procedure
The influence of xylene, toluene, MIBK, hexane and petroleum ether, as well as the sample mass of vegetable oils and fats (from 5.0 to 25 g/50 mL) were studied on background (that was registered by using deuterium background corrector) and absorbance signals of Mn, As, Pb, Cu, Cd and Zn.