Abstract
The Japan Society for Analytical Chemistry has developed plastic certified reference materials (CRMs) for the X-ray fluorescent analysis of four hazardous elements: Pb, Cd Cr and Hg in plastics. Disk samples were prepared by filling Al-cylindrical molds with the raw material liquid of polyester resin mixed with hardener and organometallic compounds. Thus 360 candidate reference materials of JSAC 0631 and 0632 were obtained. Both surfaces on prepared disks obtained after 12 h of hardening at room temperature were ground and polished by a milling machine at 4.00±0.05 mm thick. The homogeneity of the prepared disks was shown excellently. An interlaboratory comparison study was performed by 24 laboratory's participants. In a statistical evaluation for the interlaboratory study, z-scores in the "robust method" were applied in order to reject outlier. The certified uncertainties for prepared CRMs were determined at in the confidence levels of 95%.
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