Abstract
The National Institute of Standards and Technology (NIST) (formerly the National Bureau of Standards (NBS)) issued the first botanical reference material certified for elemental content in January 1971, as Standard Reference Material (SRM) 1571, Orchard Leaves. In the following years a total of nine additional botanical certified reference materials have been issued by NIST. Each of these materials was certified for major, minor and trace elements except for SRM 2695, certified for fluorine only. Botanical SRMs issued since 1991 are significantly improved over previous materials in a number of ways. Probably the most significant change is the use of a jet-milling process to grind them to extremely fine particles. This has resulted in botanical SRMs with significantly improved homogeneity. These NIST reference materials are described with information on homogeneity, drying techniques and grit content.
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References
Certificate of Analysis (1982) SRM 1572, Citrus Leaves, NIST, Gaithersburg, MD, USA (revision dated December 20, 1982)
Certificate of Analysis (1993) SRM 1515, Apple Leaves, NIST, Gaithersburg, MD USA (revision dated January 22, 1993)
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Becker, D.A., Gills, T.E. Recent developments in NIST botanical SRMs. Fresenius J Anal Chem 352, 163–165 (1995). https://doi.org/10.1007/BF00322318
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DOI: https://doi.org/10.1007/BF00322318