Links Organizações:
American Chemical Society
American National Standards Institute (ANSI)
American Society for Testing and Materials (ASTM)
American Society of Quality Control (ASQC)
Bureau International des Poids et Mesures
Chemical Abstracts Service (CAS)
COMAR - The Database for Certified Reference Materials
Comitê Consultivo para Quantidade de Matéria Substance - CCQM
Co-Operation on International Traceability in Analytical Chemistry - CITAC
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