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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 %
toluene toluene 98.0 to 100 0.1 to 0.6
Mechanism(s) for measurement service delivery: DMR-285a
Uncertainty range convention 1.
Approved on 29 April 2005.
Internal NMI service identifier: CENAM/630-C014-005
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 iron 0.7 to 3.7 3
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/610-027
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 6.840 to 6.900 0.010 6.840 to 6.900 0.011 to 0.012
Mechanism(s) for measurement service delivery: MRTC program (certification of a batch produced and latter distributed by an external manufacturer)
Temperature range for service and given values: 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.s7
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 Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty
(k = 2, 95%) in % 		Mass fraction in % Absolute expanded uncertainty
(k = 2, 95%) in %
ethanol ethanol 98 to 100 0.3 to 1 99.74 0.1
Mechanism(s) for measurement service delivery: Analytical service, DMR-95, DMR-165 x
Uncertainty range convention 1.
Approved on 03 November 2006.
Internal NMI service identifier: CENAM/630-C014-006
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 copper 10 to 30 2 to 4
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-Q008-005
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 %
organic solution PCB 28 20 to 1000 6 to 10
Mechanism(s) for measurement service delivery: Analytical service
Uncertainty convention 1. Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-QS03.001
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
Amount-of-substance content in nmol/g Relative expanded uncertainty
(k = 2, 95%) in %
rice zinc 300 to 400 3.0 to 4.0
Mechanism(s) for measurement service delivery: Value-assignment through CENAM Traceable Reference Materials (MRTC)
Approved on 19 July 2010.
Uncertainty convention 1.
Internal NMI service identifier: CENAM/620-Q008-017R
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 manganese 0.3 to 3.8 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 31 March 2012.
Internal NMI service identifier: CENAM/610-028
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 methane 10 to 50000 1
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.G010
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 Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty
(k = 2, 95%) in % 		Mass fraction in % Absolute expanded uncertainty
(k = 2, 95%) in %
isobutanol isobutanol 98 to 100 0.3 to 1 99.28 0.1
Mechanism(s) for measurement service delivery: Analytical service, DMR-165 x, DMR 96b
Uncertainty range convention 1.
Approved on 03 November 2006.
Internal NMI service identifier: CENAM/630-C014-007
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 nickel 40 to 80 1.6 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-Q008-006
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 in µmol/mol Relative expanded uncertainty
(k = 2, 95%) in %
nitrogen carbon dioxide 300 to 450 1.5
Mechanism(s) for measurement service delivery: Program for value-assignment to gas mixture from producers (MRTC)
Approved on 19 July 2010.
Internal NMI service identifier: CENAM/630-QS01.G-006
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 %
organic solution PCB 101 20 to 1000 1 to 3
Mechanism(s) for measurement service delivery: Analytical service
Uncertainty convention 1. Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-QS03.002
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
Amount-of-substance content in nmol/g Relative expanded uncertainty
(k = 2, 95%) in %
rice cadmium 2 to 14 1.7 to 3.0
Mechanism(s) for measurement service delivery: Value-assignment through CENAM Traceable Reference Materials (MRTC)
Approved on 19 July 2010.
Uncertainty convention 1.
Internal NMI service identifier: CENAM/620-Q008-016R
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 mg/g Absolute expanded uncertainty
(k = 2, 95%) in mg/g 		Mass fraction in mg/g Absolute expanded uncertainty
(k = 2, 95%) in mg/g
silica sand total aluminum as aluminum oxide 1.1 to 2 0.2 1.85 0.18
Mechanism(s) for measurement service delivery: DMR 73a
Internal NMI service identifier: CENAM/610-003
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 Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty
(k = 2, 95%) in % 		Mass fraction in % Absolute expanded uncertainty
(k = 2, 95%) in %
acetaldehyde acetaldehyde 95.7 to 100 0.3 to 1 95.7 0.5
Mechanism(s) for measurement service delivery: Analytical service
Uncertainty range convention 1.
Approved on 03 November 2006.
Internal NMI service identifier: CENAM/630-C014-008
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 %
organic solution 4,4'-DDE 8 to 600 3 to 10
Mechanism(s) for measurement service delivery: Analytical services
Uncertainty convention 1. Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-Q021-010
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 mg/g Absolute expanded uncertainty
(k = 2, 95%) in mg/g 		Mass fraction in mg/g Absolute expanded uncertainty
(k = 2, 95%) in mg/g
silica sand total titanium as titanium (IV) oxide 0.2 to 0.4 0.1 0.31 0.06
Mechanism(s) for measurement service delivery: DMR 73a
Internal NMI service identifier: CENAM/610-04
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 nmol/mol Relative expanded uncertainty
(k = 2, 95%) in %
nitrogen nitrogen monoxide 600 to 850 1.4 to 2.0
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.G011
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 mg/g Absolute expanded uncertainty
(k = 2, 95%) in mg/g 		Mass fraction in mg/g Absolute expanded uncertainty
(k = 2, 95%) in mg/g
calcium carbonate total calcium as calcium oxide 464 to 539 2 to 4 481 to 528 2 to 3.7
Mechanism(s) for measurement service delivery: DMR 59a, DMR 64a
Uncertainty convention 1.
Internal NMI service identifier: CENAM/610-005