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| NIST SRM | |
|---|---|
| Name | NIST SRM |
| Caption | Standard Reference Material logo |
| Established | 1901 |
| Type | Reference material program |
| Headquarter | Gaithersburg, Maryland |
| Parent | National Institute of Standards and Technology |
NIST SRM
NIST SRM are certified standard reference materials produced by the National Institute of Standards and Technology to provide traceable measurement standards for laboratories, manufacturers, and regulators. They support comparability among instruments such as mass spectrometry, chromatography, spectrophotometry, and X-ray fluorescence systems, enabling interoperability among organizations like the Food and Drug Administration, Environmental Protection Agency, European Medicines Agency, and International Organization for Standardization. SRMs underpin validation activities across industries including pharmaceutical industry, semiconductor industry, petroleum industry, and aerospace industry.
NIST SRM serve as benchmark materials with certified properties and documented uncertainties used by entities such as National Physical Laboratory (United Kingdom), Physikalisch-Technische Bundesanstalt, Bureau International des Poids et Mesures, U.S. Food and Drug Administration, and World Health Organization laboratories. SRMs include matrices and analyte concentrations characterized by NIST laboratories employing techniques like nuclear magnetic resonance, inductively coupled plasma mass spectrometry, thermal analysis, and optical emission spectroscopy, ensuring alignment with International System of Units conventions and supporting compliance with standards from International Electrotechnical Commission and International Organization for Standardization technical committees.
The SRM program evolved from early metrology efforts at the National Bureau of Standards and milestones involving collaborations with institutions such as the National Institutes of Health, U.S. Geological Survey, United States Pharmacopeia, and academic partners like Massachusetts Institute of Technology and University of California, Berkeley. Historical drivers included measurement challenges revealed during projects like the Manhattan Project and industrial needs articulated by firms such as Bell Laboratories and Intel Corporation. Over decades, SRM development incorporated advances from laser spectroscopy, electron microscopy, and standards initiatives like the OIML and harmonization efforts tied to the World Trade Organization.
SRMs span categories including inorganic metals and alloys standards used by Boeing and Rolls-Royce, organic reference materials for pharmaceuticals relied on by Pfizer and GlaxoSmithKline, environmental matrices for monitoring by United States Geological Survey and Environment Agency (England and Wales), and biological materials for clinical diagnostics used by Centers for Disease Control and Prevention and Mayo Clinic. Other categories include calibration artifacts for coordinate measuring machines favored by General Electric, Siemens, and traceable gas mixtures for metering equipment used by Shell and Chevron. Specialized SRMs support semiconductor metrology for firms like TSMC and Samsung Electronics and nanomaterials characterization relevant to National Nanotechnology Initiative participants.
Certification leverages interlaboratory studies including rounds with participants drawn from National Metrology Institutes such as METAS, NMi, and KRISS, and employs statistical treatments aligned with principles from the Guide to the Expression of Uncertainty in Measurement and ISO/IEC 17025 accreditation. Primary measurement methods involve comparisons to primary standards, use of reference measurement procedures from agencies like European Medicines Agency and traceability chains cited by Organisation for Economic Co-operation and Development working groups. Documentation includes certificates, uncertainty budgets, and certificates of analysis used by auditors from American Association for Laboratory Accreditation and regulators enforcing Federal Food, Drug, and Cosmetic Act provisions.
SRMs are used to validate clinical assays at institutions like Cleveland Clinic and Johns Hopkins Hospital, verify environmental monitoring programs by Environmental Protection Agency and United Nations Environment Programme, and support forensic laboratories associated with FBI and INTERPOL. Industrial quality control uses SRMs for process validation at manufacturers such as Toyota, Ford Motor Company, and Procter & Gamble; research laboratories at Lawrence Berkeley National Laboratory and Argonne National Laboratory use SRMs for method development; and regulatory submissions to agencies like European Medicines Agency and Food and Drug Administration rely on SRM-backed data.
SRMs establish traceability chains linking measurements to SI units through calibration hierarchies involving primary standards, certified reference materials from partner institutes, and participation in key comparisons organized by the Bureau International des Poids et Mesures. Quality assurance frameworks reference ISO/IEC 17025, Good Laboratory Practice (GLP), and pharmacopoeial monographs from United States Pharmacopeia and European Pharmacopoeia. Audit trails created by accredited bodies such as ANAB and reporting to consortia like the Interagency Committee on Standards and Technology reinforce confidence in measurement equivalence.
Access to SRMs is managed by NIST distribution channels with procurement used by national laboratories, universities, and corporations including IBM, Dow Chemical Company, and 3M. Maintenance involves stability studies, lot replacement, and shelf-life evaluations informed by archival programs at repositories such as National Archives and Records Administration and collaborative exchanges with National Measurement Institutes worldwide. Updates and discontinuations are coordinated with stakeholders including regulatory agencies, professional societies like the American Chemical Society and Institute of Electrical and Electronics Engineers, and industrial consortia to ensure continuity for long-term monitoring programs.
Category:Standards