Abstract
By the combined use of the decomposition of different sample sizes (1-300mg) in a sealed PTFE vessel and the atomic spectrometric measurement of elements with discrete nebulization technique, the homogeneity of NBS-SRM 1566 Oyster Tissue and 1577 Bovine Liver and NIES-CRM No. 1 Pepperbush, No. 5 Hair, No. 6 Mussel, and No. 7 Tea leaves was assessed from the relative standard deviations of the analytical results for elements. Irrespective of the sample sizes used, the small relative standard deviations of the analytical results could show the good homogeneity of the elements in the samples. But calcium in Oyster Tissue was undoubtedly inhomogeneous and iron in Oyster Tissue, Mussel, and Tea leaves showed somewhat poor homogeneity, i.e., the comparatively large relative standard deviation.
