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

Abstract

In this study, a new methodology using microwave-induced plasma atomic emission spectrometry (MP AES) after microwave assisted digestion been developed to determine aluminum, boron, cadmium, cobalt, chromium, copper, iron, lead, manganese, molybdenum, nickel, and tin concentrations in 18 commercial henna samples purchased from markets in Turkey. For the elemental determination, 0.100 g henna sample weighed and digested with 10 mL of HNO3+H2O2 (3:1) mixture in a microwave digestion system. The analytes in certified reference material bush branches and the leaves were determined in the uncertainty limits of the certified values as well as the analytes added to the henna sample prior the digestion were recovered quantitatively (95-105 %). Finally found results in henna samples were compared with several regulations from different countries as well as other published results.