HOMOGENEITY STUDIES IN A VARIETY OF REFERENCE MATERIALS USING SOLID SAMPLING ZEEMAN GRAPHITE-FURNACE AAS

For evaluation and homogeneity estimation in several plant reference and candidate reference materials from different sources, including two 2nd generation environmental specimen bank (ESB) candidate reference materials, prepared by cryogenic milling of fresh spruce shoots, solid sampling graphite furnace AAS (SSGFAAS) was used. The results obtained for the elements cadmium, copper, lead and nickel demonstrate good homogeneity even at intakes from 0.1 to 2 mg for the ESB materials in comparison to classical NIST and NIES certified reference materials of proven homogeneity and reliability. © 1990 Springer-Verlag.