DETERMINATION OF 24 ELEMENTS IN TOUR ALGAE REFERENCE MATERIALS BY NEUTRON-ACTIVATION ANALYSIS AND INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY

Four algae reference materials, IAEA-391, 392, 393 and IAEA-140, prepa red by the International Atomic Energy Agency for intercomparison unde r different preparation conditions were analyzed for 24 elements. Conv entional neutron activation analysis (NAA) was used to determine Al: C a, Cl, Co, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Sb, V and Zn and epithermal NAA using BN and Cd as shielding material for I, Br, As, Ni, Mo and Cd . Inductively coupled plasma mass spectrometry (ICP-MS) as a complemen tary and comparative method was applied to determine Pb, Sn, Ni, Sr, R b, As, Co, Cr, Cu, Mn, V, Mo and Zn. Two analytical quality control st andard reference materials IAEA-V-10 (hay powder) and IAEA-331 (spinac h) were analyzed simultaneously with real samples. The results agree q uite well with each other and with the certified values.