Accurate and precise trace element determination in biomonitors using ICP-OES

Methods are described for the multielement determination in three algae (bi omonitors) samples by inductively coupled plasma optical emission spectrome try (ICP-OES). A certified lichen material from the International Atomic En ergy agency (IAEA) was used to verify the accuracy of the methods. A marked depression in all signal measurements was observed due to acid interferenc e of the digested samples. The matrix-matched acid procedure or internal me thod of standard additions was applied to overcome the interferences. Best results were obtained by applying the matrix-matched acid procedure.