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ACID DECOMPOSITION ASSISTED BY ULTRASOUND FOR DETERMINATION OF Cu, Fe, Mg AND Zn BY F AAS IN DOMESTIC CERAMICS. This paper describes a sample preparation method for domestic ceramics, based on the acid decomposition assisted by ultrasound for further determination of Cu, Fe, Mg and Zn by Flame Atomic Absorption Spectrometry technique. The main optimized conditions were: particle size (25 µm); sample mass (25 mg) and the acid volume (0.5 mL of HNO 3 and 0.5 mL of HF). The samples were placed indoi:10.21577/0100-4042.20170013 fatcat:b5y4o74njbd3jp3amdoqnxjt6m