The complementary use of radioanalytical methods and trace analysis methods for the characterisation of environmental IAEA reference materials

The IAEA laboratories have access to both nuclear analytical methods and co nventional instrumental methods for trace analysis for the characterisation of its environmental and biological reference materials. A technical conce pt integrating the homogeneity data, the recommended test portion mass and the uncertainty on the trace element concentrations is explored using a com bination of INAA, XRF, ICP-MS, ICP-AES, and AAS. The above approach is illu strated by selected examples of reference materials currently under evaluat ion for their trace element content. They include some or all of the follow ing elements Al, As, Br, Ca, Cd, Co, Cr, Cs, Cu, Fe, Hg; K, Mg, Mn, Mo, Na, Ni, Pb, Rb, Se, Sr, Th, U, Zn in environmental biomonitor organisms (liche n, algae) and air dust filters.