Determination of 12 heavy metals in hennas by microwave induced plasma optical emission spectrometry

Abstract

In this study, Al, B ,Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb and Sn concentrations in henna samples sold in Turkey were determined by Microwave Induced Plasma Optical Emission Spectrometry. It is a relatively new technique, which uses a 2.45 GHz microwave magnetic field and nitrogen gas to sustain the plasma. With this technique, there is no requirement for flammable and toxic gases and their gas-cylinders. For the determination, each henna sample weighed approximately 0.1 g and underwent microwave-assisted digestion using 10 mL of HNO3+H2O2 (3:1) mixture. In order to test the method’s accuracy, analytes were determined in bush branches and the leaves CRM. Finally, the elemental concentrations were determined in 18 different henna samples sold in Turkey by using optimized parameters.