MULTIELEMENT DETERMINATION OF MAJOR-TO-ULTRATRACE ELEMENTS IN CHERRY SAMPLES BY ICP-MS AND ICP-AES AFTER ACID DIGESTION

The acid digestion of Tea Leaves reference materials (CRM, NIES No. 7) with nitric acid or with nitric acid and hydrofluoric acid was prelim inarily examined for a multielement determination of major-to-ultratra ce elements in plant samples by ICP-AES and ICP-MS. It was found that matrix effects due to major elements in plant samples on ICP-MS analys is could be corrected by the internal-standard method. The observed co ncentrations of lanthanoid elements in the samples were corrected by t he spectral interference equivalent concentrations of polyatomic ions. On the basis of these fundamental investigations, 41 elements in cher ry samples (leaves, petals, calyxes) collected at 9 sampling sites in Nagoya City were successfully determined. In addition, the distributio ns of the elements were also considered, especially from the viewpoint of the concentration ratios in petals and leaves.