Notice of Retraction Evaluation of Trace Element Levels of Some Medicinal Herbs in China

Notice of Retraction After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles. We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper. The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org. The concentrations of eight trace elements (Mg, Fe, Mn, Cu, Zn, Cr, Cd and Pb) in twelve kinds of medicinal herbs collected from China were determined by inductively coupled plasma atomic emission spectrometry after microwave digestion. Among all determined elements, magnesium was found to be the domination elemental ion as compared with other trace elements in the investigated herbs. The concentration of these trace elements were observed in the range of 525-5585, 70.5-375, 3.37-277, 0.44-14.8, 15.3-113, 0.68-8.06, 0.11-1.04, 0.25-6.48 μg·g-1 for magnesium, iron, manganese, copper, zinc, chromium, cadmium and lead. The levels of Cd in P. communic, B. chinense and C. deltoidea were found to be higher than legal limits. The accuracy and precision were verified by certified reference material, and the relative standard deviations were found below 10 %.