Round-Robin Interlaboratory Study on Rare-Earth Elements in U.S.-Based Geologic Materials by Bruce Folkedahl, Carolyn Nyberg, Saptashati Biswas, Xuefei Zhang

“…Five of the seven labs reporting data for Procedure A and three of the five labs reporting for Procedure B showed excellent performance in terms of repeatability, reproducibility, agreement with NAA, and SRM recoveries based on AOAC International guidelines on method performance. This indicates that when strictly followed these methods are suitable for REE determination in most materials, although are subject to the overall capabilities and experience of individual laboratories.…”
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