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Secondary reference standards: Reference standards calibrated against and traceable to primary WHO materials and intended for use in routine tests; Reference reagent: a WHO reference standard, the activity of which is defined by WHO in terms of a unit; For chemical substances some pharmacopoeias [10] use the WHO terms [11]
The Journal of Research of the National Institute of Standards and Technology was the flagship scientific journal at NIST. It was published from 1904 to 2022. First published in 1972, the Journal of Physical and Chemical Reference Data, is a joint venture of the American Institute of Physics and the National Institute of Standards and Technology.
NIST SRM 1898 is a reference material consisting of a dry powder of TiO 2 nanocrystals. It is intended as a benchmark in environmental or toxicological studies, and for calibrating instruments that measure specific surface area of nanomaterials by the Brunauer–Emmet–Teller method. [23] [26] [27] [28]
The δ values and absolute isotope ratios of common reference materials are summarized in Table 1 and described in more detail below. Alternative values for the absolute isotopic ratios of reference materials, differing only modestly from those in Table 1, are presented in Table 2.5 of Sharp (2007) [1] (a text freely available online), as well as Table 1 of the 1993 IAEA report on isotopic ...
Transmission electron micrograph of titanium dioxide nanoparticles from NIST Standard Reference Material 1898. Reference materials are materials that are established or produced to be homogeneous and stable in at least one measurable physical property to provide a control measurement.
1 Material Safety Data Sheet. ... (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, ...
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