Development of Plastic Certified Reference Materials for XRF analysis (JSAC 0611-0615) containing Pb, Cd, Cr; Part 1. Sample Preparation and Homogeneity test.

New plastic certified reference materials (CRMs) with Pb, Cd and Cr for XRF analysis have been developed in cooperation with the Japan Society for Analytical Chemistry. These CRMs (named as JSAC 0611 ‐ 0615) were prepared by casting polyester including a toluene solution of organometallic compounds as a standard. The disk was removed from the glass plate after 12 h of hardening at room temperature. Concentrations of the three trace elements ranged from 0 to 200 mg/kg for Pb, 0 to 50 mg/kg for Cd, and 0 to 200 mg/kg for Cr. A homogeneity test by XRF measurement showed that the three metals were uniformly distributed in the disk.