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Metrology

# Amount of substance

## News and Updates

### Sounding Out a New Way to Measure Gas Flow

March 31, 2023

### 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

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

December 20, 2021

View All News and Updates

## Projects and Programs

### NIST Tools for Cannabis Laboratory Quality Assurance

### Micronutrients Measurement Quality Assurance Program (MMQAP)

### International Comparisons for Chemical Measurements

### Fatty Acids in Human Serum and Plasma Quality Assurance Program (FAQAP)

View All Projects/Programs

## Publications

### CCQM_Retrospectoscope Quick Start: A beginner's guide to a data analysis system for visualizing results from CCQM studies

September 12, 2023

David L.  DuewerMichael  NelsonChristina  Cecelski

### CCQM_Retrospectoscope Reference Manual: A detailed reference to the CCQM_Retrospectoscope, a suite of graphical tools for the meta-analysis of measurement results from CCQM studies

September 12, 2023

David L.  DuewerMichael  NelsonChristina  Cecelski

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

January 18, 2023

David L.  DuewerKatrice  LippaBrian  LangBlaza  TomanMichael  NelsonKenneth W. Pratt

### Isotope Dilution Mass Spectrometry as an Independent Assessment for Mass Measurements of Milligram Quantities of Aqueous Solution

January 1, 2023

Richard  EssexJacqueline L.  MannDenis E.  BergeronRyan P.  FitzgeraldSvetlana  NourGordon A.  ShawR. Michael  Verkouteren

## Tools and Instruments

### Local Electrode Atom Probe Tomography (LEAP)

### Material Analysis Using Neutron Depth Profiling

View All Tools & Instruments

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