Abstract
The Japan Society for Analytical Chemistry has developed plastic certified reference materials (CRMs) for the X-ray fluorescent analysis of bromine in plastics. Disk samples were prepared by filling Al-cylindrical molds with raw material liquid of polyester resin mixed with a hardener and bromine compounds. Thus, 300 candidate reference materials of JSAC 0651-0655 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 prepared disks was shown to be excellent. The certified values were evaluated by a statistical analysis of the results of an interlaboratory comparison study. An interlaboratory comparison study was performed by participants from 19 laboratories. The medians of the results were applied for the certified values in stead of the averages as before, because there was some lower bias in reports from some laboratories.
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