Soil‐5, A New IAEA CErtifiEd Reference Material for Trace Element Determinations*

Abstract

60 geochemical laboratories from the world over, contributing in all 3687 bits of chemical data on 60 elements, haue willingly participated in the study of SOIL‐5 as a reference material. The preparation of SOIL‐5 in 45 kg and homogeneity teats are described; in addition, all the data compiled are presented. In evaluating the compiled data, the use of four concurrent tests for outlier‐rejection at the same level of significance, has been applied. After proper statistical treatment, “recommended values” could be established for 31 elements, most of them trace elements and “information values” for 29 elements. 23 of the recommended values could be given with a “relatively high” degree confidence whereas the other 18 recommended Values with a “reasonable” degree of confidence. An attempt is made to compare the analytical methods employed; the existence of possible sy3tematic differences is pointed ont.

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