Proposed standard ASTM WK44003, Test Method for Identification and Quantification of Rare Earth Elements (REEs) in Rare Earth Materials (REMs) by X-Ray Fluorescence Spectrometry, is under development by Subcommittee F40.04 on REMs. According to F40 chairman Taco van der Maten, testing to this proposed standard will allow for quality statement for REEs and REMs so users know what they are buying. Standard will also provide for sustainable long-term supply of stable quality REEs.
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