Key comparison demonstrates accuracy of N₂O in Air Greenhouse Gas Standards

The comparison of nitrous oxide in air standards from ten laboratories has demonstrated reference value uncertainties of 0.1 nmol/mol to 0.3 nmol/mol, for the third most important greenhouse gas in the atmosphere. Globally averaged atmospheric amount fractions have surpassed 334.5 nmol/mol and annual growth rates exceed 1 nmol/mol.

Octad of standards for qNMR purity measurements

Publication of the benzoic acid reference document, together with seven others, provides guidance for the use of a universal suite of eight higher order SI-traceable primary standards, the Octad, for the purity assignment of organic compounds using qNMR in any solvent.

Rapport BIPM-2023/02: qNMR ISRD - Benzoic Acid [ISRD-08]

New international guidelines on organic pure material standards

The International Union of Pure and Applied Chemistry’s (IUPAC) guidelines for purity assignment of organic compounds have been updated with a newly published Technical Report on best practice.