Abbreviations and acronyms

BIPM: Bureau International des Poids et Mesures

COMAR: international data bank on reference materials

EPTIS: proficiency testing information system on internet

EURACHEM: european focus for analytical chemistry ,

IUPAC: international union of pure and applied chemistry

JRC-IRMM: joint research center – institute for reference materials and measurements

LNE-INM: laboratoire national de métrologie et d'essais – national metrology institute (France)

MR: reference material

MRC: certified reference material

ERM: external reference material

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