NIST's Chemical Sciences Division has participated in over 50 Consultative Committee for Amount of Substance - Metrology in Chemistry (CCQM) Organic Analysis Working Group (OAWG) studies since 1997 and coordinated numerous studies over this long history. The CCQM conducts international comparisons to establish equivalence among measurements made by national metrology institutes (NMIs). Recent OAWG studies included a direct comparison of CRMs for vitamin B3 (niacin) in milk powders and infant/adult nutritional formulas, polycyclic aromatic hydrocarbons (PAHs) in olive oil, purity assessments of folic acid and bisphenol A.
The results from these studies will be used to demonstrate the capabilities of participating NMIs for their similar measurement services, and eventually benchmark the appropriate Calibration and Measurement Capabilities (CMCs) that summarizes this capability. NIST CMCs that directly support SI traceability (e.g., pure chemical standards, calibration solutions) are also benchmarked by this process.
Duewer, D. L., Gasca-Aragon, H., Lippa, K. A., and Toman, B., "Experimental design and data evaluation considerations for comparisons of reference materials," Accreditation and Quality Assurance, 17, 567-588 (2012).