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Materiales de referencia

	NIST Standard Reference Materials
	The IAEA Database of Natural Matrix Reference Materials

EURACHEM

EURACHEM Home page (HTML)

	EURACHEM Guide - The Fitness for Purpose of Analytical Methods: A Laboratory Guide to Method Validation and Related Topics (First Internet Version, December 1998) (PDF)
	EURACHEM/CITAC Guide CG 4 - Quantifying Uncertainty in Analytical Measurement (Second Edition, 2000) (PDF)
	CITAC/EURACHEM Guide - Guide to Quality in Analytical Chemistry: An Aid to Accreditation (Edition 2002) (PDF)
	EURACHEM/EA Guide 04/10 - Accreditation for Microbiological Laboratories (July 2002) (PDF)
	EURACHEM/CITAC Guide - Traceability in Chemical Measurement - A Guide to Achieving Comparable Results in Chemical Measurement (2003) (PDF)

NIST (U.S. Department of Commerce - National Institute of Standards and Technolology)

NIST Home page (HTML)

NIST Technical Note 1297 (September 1994 Edition) - Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results (PDF)

The International Laboratory Acreditation Cooperation (ILAC)

ILAC Home page (HTML)

ILAC G2:1994 - Traceability of Measurements (PDF)

Nordic Council of Ministers

NORDTEST Home page (HTML)

Nordtest Report TR 537 - Handbook for Calculation of Measurement Uncertainty in Environmental Laboratories (June 2003) (PDF)

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