Amount of substance

News and Updates

After 90 Years, a Better Way to Measure the Composition of Paper

February 14, 2019

Researchers at the National Institute of Standards and Technology (NIST), in collaboration with the U.S. Government

Better Flowmeters with the Big Blue Ball

February 24, 2017

Last year, upwards of 25 trillion cubic feet of natural gas were delivered to customers in the United States, and when

How Sweet It Is: NIST Metrology and the Maple Syrup Industry

January 4, 2017

NIST is frequently asked to provide unusual, sometimes downright exotic, measurements and calibrations in support of U.S

Redefining the SI Base Units

November 2, 2011

Note: Much more recent information is available about redefinition of the SI units. For a comprehensive general

Projects and Programs

NIST PS1 Primary Standard for quantitative NMR (Benzoic Acid)

The "first-of-its-kind" in an entirely new class of reference material, NIST PS1 Primary Standard for quantitative NMR (Benzoic Acid) is now available! The PS

International Comparisons for Chemical Measurements

Because of NIST's role as the National Metrology Institute (NMI) in the U.S., the Chemical Sciences Division's measurement capabilities must be benchmarked

Advanced Ambient Mass Spectrometry, Secondary Ion Mass Spectrometry and Ion Mobility Spectrometry

The Surface and Trace Chemical Analysis Group (STCAG) conducts both applied and fundamental research into the development, characterization, and analysis of

Publications

Stability of gaseous volatile organic compounds contained in gas cylinders with different internal wall treatments

July 29, 2019

Author(s)

George C. Rhoderick, Christina E. Cecelski, Walter R. Miller Jr., David Worton, Sergi Moreno, Paul Brewer, Joele Viallon, Faraz Idrees, Philippe Moussay, Yong D. Kim, Dal H. Kim, Sangil Lee, Annarita Baldan, Jianrong Li

Volatile organic compounds (VOCs) are a group of gas-phase compounds present in the atmosphere that affect air quality and Earths climate. Halocarbons, a

Certification of Standard Reference Material® 2193b Calcium Carbonate [used as saturated Ca(OH)2 solution]

May 16, 2019

Author(s)

Regina A. Easley, Jason F. Waters, William F. Guthrie

Report of the Pilot study CCQM-P188 (in parallel with CCQM-K120.a and b)

January 31, 2019

Author(s)

Christopher W. Meyer, Flores Edgar, Viallon Joele, Tiphaine Choteau, Philippe Moussay, Faraz Idrees, Robert Wielgosz, Daniel Rzesanke

The Pilot Study CCQM-P188 was conducted in parallel of the Key Comparisons CCQM-K120.a and CCQM-K120.b, which were designed to evaluate the level of

CCQM-K131 Low-Polarity Analytes in a Multicomponent Organic Solution: Polycyclic Aromatic Hydrocarbons (PAHs) in Acetonitrile

November 30, 2018

Author(s)

David L. Duewer, Lane C. Sander, Stephen A. Wise

Solutions of organic analytes of known mass fraction are typically used to calibrate the measurement processes used to determine these compounds in matrix

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,