Amount of substance

News and Updates

Research on the Rocks: Combining Neutrons and X-Ray Imaging, NIST Scientists Study Meteorites to Explore the Mystery of How Earth Acquired Its Water

November 3, 2022

Each year, hundreds of meteorites — rocky bodies left over from the formation of the solar system — bombard Earth, delivering minerals, metals and water to our

Sneezes, Rain Clouds and Ink Jets: NIST Improves the Ability of Optical Microscopes to Measure the Volume of Microdroplets

December 20, 2021

Sneezes, rain clouds, and ink jet printers: They all produce or contain liquid droplets so tiny it would take several billion of them to fill a liter bottle

Identifying Individual Molecules: NIST Study Suggests How to Build a Better ‘Nanopore’ Biosensor

April 27, 2021

Researchers have spent more than three decades developing and studying miniature biosensors that can identify single molecules. In five to 10 years, when such

Projects and Programs

NIST Tools for Cannabis Laboratory Quality Assurance

Ongoing

NIST has developed an integrated measurement services program for forensic and cannabis testing laboratories to help ensure the quality of routine analysis

CCQM Activities in the Gas Analysis Working Group

Ongoing

NIST's Chemical Sciences Division Gas Sensing Metrology Group has participated in over 40 Consultative Committee for Amount of Substance-Metrology in Chemistry

Dietary Supplements Laboratory Quality Assurance Program (DSQAP)

Ongoing

The National Institute of Standards and Technology (NIST), in collaboration with the National Institutes of Health (NIH) Office of Dietary Supplements (ODS)

Health Assessment Measurements Quality Assurance Program (HAMQAP)

Completed

The National Institute of Standards and Technology (NIST) established a Health Assessment Measurements Quality Assurance Program (HAMQAP), in part as a

Publications

Methods for the SI Value Assignment of the Purity of Organic Compounds (IUPAC Technical Report)

January 18, 2023

Author(s)

David L. Duewer, Katrice Lippa, Brian Lang, Blaza Toman, Michael Nelson, Kenneth W. Pratt, Steven Westwood, Yoshitaka Yoshitaka Shimuzu, Takeshi Saito, Beatrice Lalerle, Xinhua Dai, Stephen Davies, Marina Ricci, Annarita Baldan, Stefan Sarge, Haifeng Wang, Ralf D. Josephs, Michal Mariassy, Dietmar Pfieffer, John Warren, Wolfram Bremser, Stephen L.R. Ellison, Ting Huang, Ales Fajgelj, Lindsey Mackay, Robert Wielgosz

Metrological traceability to the SI of the result of an analysis for an organic compound is achieved through a calibration hierarchy anchored in a primary

Cannabis Quality Assurance Program: Exercise 2 Toxic Elements Final Report

December 15, 2022

Author(s)

Chuck Barber, Colleen E. Bryan Sallee, Carolyn Burdette, Shaun Kotoski, Melissa M. Phillips, Walter Brent Wilson, Laura Wood

In 2020, NIST launched CannaQAP to improve the comparability of the analytical measurements of cannabis and cannabis-derived products in forensic and cannabis

Major to Trace Element Imaging and Analysis of Iron Age Glasses Using Stage Scanning in The Analytical Dual Beam Microscope (Tandem)

June 16, 2022

Author(s)

Edward P. Vicenzi, Thomas Lam, Jamie Weaver, Andrew Herzing, John McCloy, Rolf Sjöblom, Carolyn Pearce

Dark and clear silicate glasses formed during an iron age vitrification event ≈ 1500 years ago at the Broborg hillfort near Uppsala, Sweden have been analyzed

Common Single-use Consumer Plastic Products Release Trillions of Nanoparticles per Liter into Water During Normal Use

April 20, 2022

Author(s)

Christopher D. Zangmeister, James Radney, Kurt D. Benkstein, Berc Kalanyan

This study demonstrates that commonly used consumer products such as single use food grade nylon bags and hot beverage cups lined with low-density polyethylene

Tools and Instruments

Local Electrode Atom Probe Tomography (LEAP)

Field evaporates (with a voltage and laser pulse) a sharp tip-shaped specimen. Collects the ionization products in a position-sensitive, time-of-flight mass

Material Analysis Using Neutron Depth Profiling

Light elements such as helium, lithium, boron, and nitrogen are essential constituents in materials that enable energy technologies; lithium ion batteries