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Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Sediments, soils, ores, and particulates for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in µg/g Absolute expanded uncertainty
(k = 2, 95%) in µg/g
Mass fraction in µg/g Absolute expanded uncertainty
(k = 2, 95%) in µg/g
silica sand total iron as iron (III) oxide 120 to 1800 10 to 40 200 to 940 10 to 40
Mechanism(s) for measurement service delivery: DMR 22a, DMR 22b, DMR 22c, DMR 22d, DMR 73a
Uncertainty convention 1.
Internal NMI service identifier: CENAM/610-001

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Organic solutions for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in ng/g Relative expanded uncertainty
(k = 2, 95%) in %
solvent solution 2,4'-DDE 10 to 600 2 to 10
Mechanism(s) for measurement service delivery: Analytical services, PT 630-IL-1203
Uncertainty convention 1. Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-Q021-004

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Gases for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Amount-of-substance fraction in µmol/mol Relative expanded uncertainty
(k = 2, 95%) in %
nitrogen nitrogen monoxide 100 to 10000 0.6 to 1
Mechanism(s) for measurement service delivery: Program for value-assignment to gas mixture from producers (MRTC), calibration services and analytical services
Uncertainty convention 1.
Approved on 27 March 2013.
Internal NMI service identifier: CENAM/630-QS01.G002

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for pH for Mexico (.PDF file)
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH Absolute expanded uncertainty
(k = 2, 95%)
pH Absolute expanded uncertainty
(k = 2, 95%)
aqueous pH buffer solution 9.080 to 9.260 0.003 to 0.010 9.080 to 9.260 0.003 to 0.010
Mechanism(s) for measurement service delivery: DMR 358
Temperature range for service: 15 °C to 37 °C, values given for 25°C.
Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention (~0.010, k=2).
Uncertainty convention 1.
Approved on 31 March 2012.
Internal NMI service identifier: CENAM/630-Q024-001.p9

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Biological fluids and materials for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in mg/kg Relative expanded uncertainty
(k = 2, 95%) in %
Mass fraction in mmol/l Absolute expanded uncertainty
(k = 2, 95%) in mmol/l
human serum creatinine 4 to 7 3.7 0.0664 0.0032
Mechanism(s) for measurement service delivery: DMR 263a
Approved on 12 June 2007.
Internal NMI service identifier: CENAM/630-C014-001b

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Metals and metal alloys for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in mg/g Relative expanded uncertainty
(k = 2, 95%) in %
iron molybdenum 2 to 11 2.8
Mechanism(s) for measurement service delivery: Analytical service, reference materials: DES-025, DES-026, DES-027, DES-028
Approved on 31 March 2012.
Internal NMI service identifier: CENAM/610-024

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Food for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in µg/kg Absolute expanded uncertainty
(k = 2, 95%) in µg/kg
Mass fraction in µg/kg Absolute expanded uncertainty
(k = 2, 95%) in µg/kg
milk powder cadmium 2 to 3 1.0 2.95 0.91
Mechanism(s) for measurement service delivery: DMR-65a
Approved on 01 March 2005.
Internal NMI service identifier: CENAM/620-Q008-014

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Advanced materials for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in mg/kg Relative expanded uncertainty
(k = 2, 95%) in %
polyethylene mercury 300 to 600 3 to 5
Mechanism(s) for measurement service delivery: Value-assignment through MRTC program
MRTC program: certification of a batch produced and later distributed by an external manufacturer.
Uncertainty convention 1.
Approved on 31 March 2012.
Internal NMI service identifier: CENAM/620-Q004-1

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for High purity chemicals for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in % Absolute expanded uncertainty
(k = 2, 95%) in %
p-xylene p-xylene 98.0 to 100 0.1 to 0.6
Mechanism(s) for measurement service delivery: DMR-232
Uncertainty range convention 1.
Approved on 29 April 2005.
Internal NMI service identifier: CENAM/630-C014-003

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Organic solutions for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in ng/g Relative expanded uncertainty
(k = 2, 95%) in %
solvent solution cis-chlordane 10 to 600 2 to 10
Mechanism(s) for measurement service delivery: Analytical services, PT 630-IL-1203
Uncertainty convention 1. Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-Q021-005

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Water for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in µg/kg Relative expanded uncertainty
(k = 2, 95%) in %
fresh water cadmium 4 to 160 1.4 to 3
Mechanism(s) for measurement service delivery: Value-assignment through MRTC program
Approved on 27 March 2013.
Uncertainty convention 1.
Internal NMI service identifier: CENAM/620-Q008-003

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Metals and metal alloys for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in mg/g Relative expanded uncertainty
(k = 2, 95%) in %
aluminum zinc 0.4 to 1.7 1.4
Mechanism(s) for measurement service delivery: Analytical service, reference materials: DES-036, DES-037, DES-038, DES-039, DES-040, DES-052, DES-053, DES-054, DES-055, DES-056, DES-057, DES-058, DES-059, DES-060, DES-061, DES-062, DES-063, DES-064, DES-065, DES-066
Approved on 12 June 2007.
Internal NMI service identifier: CENAM/610-025

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for pH for Mexico (.PDF file)
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH Absolute expanded uncertainty
(k = 2, 95%)
pH Absolute expanded uncertainty
(k = 2, 95%)
aqueous pH buffer solution 10.000 to 10.040 0.007 10.000 to 10.040 0.007 to 0.010
Mechanism(s) for measurement service delivery: DMR-324 I / II
Temperature range for service: 15 °C to 37 °C, values given for 25°C.
Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention (~0.010, k=2).
Uncertainty convention 1.
Approved on 31 March 2012.
Internal NMI service identifier: CENAM/630-Q024-001.P10

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Inorganic solutions for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass concentration in mg/L Relative expanded uncertainty
(k = 2, 95%) in %
Mass concentration in mg/L Absolute expanded uncertainty
(k = 2, 95%) in %
HNO3 in aqueous solution aluminum 7.0 to 20.0 0.4 to 3.5 8.0 to 16.0 3.3
Mechanism(s) for measurement service delivery: DMR-8: annual PT
Uncertainty convention 1.
Approved on 27 March 2013.
Internal NMI service identifier: CENAM/620-C002-008

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for High purity chemicals for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in % Absolute expanded uncertainty
(k = 2, 95%) in %
benzene benzene 98.0 to 100 0.1 to 0.6
Mechanism(s) for measurement service delivery: DMR-284a
Uncertainty range convention 1.
Approved on 29 April 2005.
Internal NMI service identifier: CENAM/630-C014-004

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Advanced materials for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in mg/kg Relative expanded uncertainty
(k = 2, 95%) in %
ceramics aluminum 700 to 1000 4 to 5
Mechanism(s) for measurement service delivery: Value-assignment through MRTC program
MRTC program: certification of a batch produced and later distributed by an external manufacturer.
Uncertainty convention 1.
Approved on 31 March 2012.
Internal NMI service identifier: CENAM/610-038

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Gases for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Amount of sustance fraction in µmol/mol Relative expanded uncertainty
(k = 2, 95%) in %
nitrogen propane 50 to 50000 2
Mechanism(s) for measurement service delivery: Program for value-assignment to gas mixture from producers (MRTC), calibration services and analytical services
Approved on 27 March 2013.
Internal NMI service identifier: CENAM/630-QS01.G003

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Biological fluids and materials for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in mg/kg Relative expanded uncertainty
(k = 2, 95%) in %
human serum creatinine 20 to 40 2.7
Mechanism(s) for measurement service delivery: Proficiency test and analytical service
Approved on 12 June 2007.
Internal NMI service identifier: CENAM/630-C014-002b

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Food for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in µg/g Relative expanded uncertainty
(k = 2, 95%) in %
Mass fraction in µg/g Absolute expanded uncertainty
(k = 2, 95%) in %
milk powder vitamin E (a-tocopherol) 11 to 400 11 to 17 34 to 80 11 to 17
Mechanism(s) for measurement service delivery: DMR-273a, DMR-274a, Proficiency test 630-Q016-005-PA
Uncertainty range convention 1.
Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-Q016-001

Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Organic solutions for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability
Mass fraction in ng/g Relative expanded uncertainty
(k = 2, 95%) in %
solvent solution trans-nonachlor 10 to 600 1 to 10
Mechanism(s) for measurement service delivery: Analytical services, PT 630-IL-1203
Uncertainty convention 1. Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-Q021-006