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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 4.000 to 4.030 0.011 4.000 to 4.030 0.011
Mechanism(s) for measurement service delivery: DMR 283
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.p4
Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Electrolytic conductivity for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in S/m Absolute expanded uncertainty
(k = 2, 95%) in S/m 		Electrolytic conductivity in S/m Absolute expanded uncertainty
(k = 2, 95%) in S/m
aqueous solution Electrolytic conductivity 0.00499 to 0.04991 0.00010 to 0.00050 0.0149 to 0.0152 0.00014 to 0.00015
Mechanism(s) for measurement service delivery: DMR-297
Reference value certified at 25 °C.
Uncertainty convention 1.
Approved on 31 March 2012.
Internal NMI service identifier: CENAM/630-Q022-001.s
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 arsenic 20 to 60 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-Q008-001
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 µg/L Relative expanded uncertainty
(k = 2, 95%) in % 		Mass concentration in µg/L Absolute expanded uncertainty
(k = 2, 95%) in %
HNO3 in aqueous solution mercury 5.0 to 25.0 3.5 to 4.0 9 to 21 3.8 to 4.6
Mechanism(s) for measurement service delivery: DMR-2: annual PT
Uncertainty convention 1.
Approved on 27 March 2013.
Internal NMI service identifier: CENAM/620-Q008-008
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 Absolute expanded uncertainty
(k = 2, 95%) in mg/kg 		Mass fraction in mmol/l Absolute expanded uncertainty
(k = 2, 95%) in mmol/l
human serum glucose 600 to 900 8 to 15 4.6 0.13
Mechanism(s) for measurement service delivery: DMR 263a
Uncertainty convention 1.
Approved on 12 June 2007.
Internal NMI service identifier: CENAM/630-Q023-001b
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 chromium 0.7 to 7 2.7
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/610-022
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 carbon monoxide 10 to 80000 3 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 2.
Approved on 27 March 2013.
Internal NMI service identifier: CENAM/630-QS01.G001
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 %
o-xylene o-xylene 98.0 to 100 0.1 to 0.6
Mechanism(s) for measurement service delivery: DMR-230
Uncertainty range convention 1.
Approved on 29 April 2005.
Internal NMI service identifier: CENAM/630-C014-001
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 lead 300 to 600 2 to 3
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-Q008-21
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 %
red wine lead 0.1 to 0.2 7.7
Mechanism(s) for measurement service delivery: Analytical service
Internal NMI service identifier: CENAM/620-Q018-001
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
Amount-of-substance content in nmol/g Relative expanded uncertainty
(k = 2, 95%) in %
sediment lead 140 to 180 3.5
Mechanism(s) for measurement service delivery: Analytical service
Internal NMI service identifier: CENAM/620-Q008-011
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 hexachlorobenzene 20 to 4000 2 to 10
Mechanism(s) for measurement service delivery: Analytical services, PT 600-IL-1200
Uncertainty convention 1. Approved on 01 March 2005.
Internal NMI service identifier: CENAM/630-Q021-001
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 0.003 to 0.010 6.840 to 6.900 0.005
Mechanism(s) for measurement service delivery: DMR 206
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.p7
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 %
aqueous solution chromium (VI) 0.10 to 4.00 2.0 to 3.0 1.623 3.5
Mechanism(s) for measurement service delivery: DMR-3: annual PT and value-assignment through MRTC program
Uncertainty convention 1.
Approved on 27 March 2013.
Internal NMI service identifier: CENAM/620-C007-01
Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Chemistry for Electrolytic conductivity for Mexico (.PDF file)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in S/m Absolute expanded uncertainty
(k = 2, 95%) in S/m 		Electrolytic conductivity in S/m Absolute expanded uncertainty
(k = 2, 95%) in S/m
aqueous solution Electrolytic conductivity 0.050000 to 0.15000 0.00014 to 0.00045 0.14020 to 0.14091 0.00045
Mechanism(s) for measurement service delivery: DMR-148
Reference value certified at 25 °C.
Uncertainty convention 1.
Approved on 31 March 2012.
Internal NMI service identifier: CENAM/630-Q024-004R
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 Absolute expanded uncertainty
(k = 2, 95%) in mg/kg
human serum glucose 1100 to 1400 12 to 24
Mechanism(s) for measurement service delivery: Proficiency test and analytical service
Uncertainty convention 1.
Approved on 12 June 2007.
Internal NMI service identifier: CENAM/630-Q023-002b
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 manganese 3 to 10 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/610-023
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 lead 15 to 50 8.48 21.53 8.48
Mechanism(s) for measurement service delivery: DMR-65a
Internal NMI service identifier: CENAM/630-Q022-001
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 barium 400 to 600 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-Q008-002
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 %
m-xylene m-xylene 98.0 to 100.0 0.1 to 0.6
Mechanism(s) for measurement service delivery: DMR-231
Uncertainty range convention 1.
Approved on 29 April 2005.
Internal NMI service identifier: CENAM/630-C014-002