Abstract
The Japan Society for Analytical Chemistry has developed two new certified reference materials (CRMs) for dioxins and coplanar PCBs. A project team was organized to prepare 2 kinds of forest soil and to certify the concentration of dioxins. An interlaboratory comparison test was performed with the participation of 15 laboratories. In a statistical, analysis, z-scores in the "robust method" were applied to estimate the degree of bias of reported data from the mean value in order to reject any data with a big bias, and was followed by the usual statistical procedure. The presented CRMs are expected to be useful for the quality assurance and quality control of dioxins analysis.
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