Determination of Nine Trace Elements in Plant Samples by Inductively Coupled Plasma Mass Spectrometry in Mixed Mode

A method of inductive coupled plasma mass spectrometry(ICP-MS) in mixed mode was established to determine the trace elements in plant samples,such as vegetables,fruit and rice.After digested by HNO3+H2O2,nine trace elements of As,Hg,Pb,Cd,Cr,Se,Cu,Ni and Zn in the samples were analyzed by using the technology of the collision/reaction cell with kinetic energy discrimination(KED) to eliminate the interference of mass spectrometry.74Ge,115In and 209Bi were also used to eliminate the matrix interference.The results indicated that the linear range of the method was beyond two orders of magnitude and the linear correlation coefficient was not less than 0.999 2.The limits of detection(LOD) were in the range of 0.8-40 μg/kg with RSDs of 0.6%-5.8%.The established method was used to determine the three certified reference materials of rice flour(GBW10010),spinach(GBW10015) and apple(GBW10019),and the analysis results were all in material reference range.The method was simple,rapid and accurate,and was suitable for the determination of multi-elements in plant samples simultaneously.