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Metrology

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US TAG for ISO/TC 334: Reference Materials

Ongoing

Get involved: Interested US Stakeholders may participate in the US TAG at no cost. Membership provides access to all ISO/TC 334 and US TAG documents, including standards under development. Please click here to join or renew your membership. Contribute to standards development : Please click here to

Thermal Desorption Ambient Mass Spectrometry

Ongoing

The Surface and Trace Chemical Analysis Group is involved in a number of research avenues for the rapid screening of wipe-collected samples for the security and forensic chemistry fields. Similar to the widely-deploy ion mobility spectrometry (IMS) systems for screening, this is accomplished through

Time-of-Flight Secondary Ion Mass Spectrometry

Ongoing

ToF-SIMS is an imaging mass spectrometry (MS) technique that allows us to obtain isotopic, elemental, and molecular information from the surface of solid samples. A pulsed, energetic “primary” ion beam bombards the surface and induces a collision cascade, liberating “secondary” ions that are then

Vitamin D Metabolites Quality Assurance Program (VitDQAP)

Completed

Interlaboratory comparison studies of the VitDQAP supported the reliability of vitamin D measurements, including determination of 25-hydroxyvitamin D2, 25-hydroxyvitamin D3, and 3- epi-25-hydroxyvitamin D3 in human serum and plasma. Results from the comparison studies helped participants to make

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NIST Headquarters
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