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In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
Mexico, CENAM (Centro Nacional de Metrologia)
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 9.08 to 9.26 3.0E-3 to 1.0E-2 9.08 to 9.26 3.0E-3 to 1.0E-2
  • Mechanism 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)
  • Approved on 31 March 2012
  • Institute service identifier : 630-Q024-001.p9
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in S/m Absolute expanded uncertainty in S/m Electrolytic conductivity in S/m Absolute expanded uncertainty in S/m
aqueous solution 0.15 to 1.5 1.2E-3 to 1.2E-2 1.25 to 1.29 1.0E-2 to 1.1E-2
  • Mechanism for measurement service delivery : DMR-460
  • Reference value certified at 25 °C
  • Approved on 20 July 2020
  • Institute service identifier : 620-Q022-003.s
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in mS/m Absolute expanded uncertainty in mS/m Electrolytic conductivity in mS/m Absolute expanded uncertainty in mS/m
aqueous solution 15 to 150 4.8E-2 to 0.48 139 to 142.5 0.45 to 2
  • Mechanism for measurement service delivery : DMR-148
  • Reference value certified at 25 °C
  • Approved on 20 July 2020
  • Institute service identifier : 620-Q022-002.s
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 3.99 to 4.03 1.0E-2 to 1.7E-2 3.99 to 4.03 1.0E-2 to 1.7E-2
  • Mechanism for measurement service delivery : CMR 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.
  • Approved on 23 June 2021
  • Institute service identifier : 620-Q024- 001.p4
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 6.8 to 7.5 3.2E-3 to 5.4E-3 6.8 to 7.5 4.0E-3 to 6.0E-3
  • Mechanism for measurement service delivery : CMR 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.
  • Approved on 23 June 2021
  • Institute service identifier : 620-Q024-002.p7
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
Electrolytic conductivity in mS/m Absolute expanded uncertainty in mS/m Electrolytic conductivity in mS/m Absolute expanded uncertainty in mS/m
aqueous solution 1.5 to 15 2.6E-2 to 0.26 4.8 to 15.2 9.0E-2 to 0.4
  • Mechanism for measurement service delivery : DMR-297 and DMR-527
  • Reference value certified at 25 °C
  • Approved on 20 July 2020
  • Institute service identifier : 620-Q022-001.s and 620-Q022-004.s
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 6.8 to 7.5 1.5E-2 6.8 to 7.5 1.5E-2
  • Mechanism 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.
  • Approved on 23 June 2021
  • Institute service identifier : 620-Q024-006.s7
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 3.8 to 4.2 1.5E-2 3.8 to 4.2 1.6E-2
  • Mechanism 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.
  • Approved on 16 July 2021
  • Institute service identifier : 620-Q024- 005.s4
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 9.5 to 10.5 1.1E-2 9.5 to 10.5 1.3E-2
  • Mechanism for measurement service delivery : Primary measurement of carbonate CMR 324
  • Temperature range for service: 25 °C, values given for 25°C. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention.
  • Approved on 16 July 2021
  • Institute service identifier : 620-Q024-004.P10
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in mg/g Relative expanded uncertainty in % Mass fraction in mg/g Relative expanded uncertainty in %
Multi-component ethanol/water solution 1-butanol 1 to 5 3 to 1.3 2 to 2.5 3 to 1.3
  • Mechanism for measurement service delivery : Analytical measurement and MRC DMR 380
  • Reference value assignment of VOC to PT and CRMs
  • Approved on 20 July 2020
  • Institute service identifier : 630-Q021-027
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty in % Mass fraction in % Relative expanded uncertainty in %
1-butanol 1-butanol 98 to 100 0.22 99.74 to 99.84 0.22
  • Mechanism for measurement service delivery : Analytical services, DMR-165 x, DMR-380 x, DMR-480 x, DMR-517 x. Some of these reference materials are used as a primary reference material for preparing internal solutions.
  • Approved on 17 May 2020
  • Institute service identifier : 630-C014-014
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in mg/g Relative expanded uncertainty in % Mass fraction in mg/g Relative expanded uncertainty in %
Multi-component ethanol/water solution 1-pentanol 1 to 8 3 to 2 6 to 6.5 3 to 2
  • Mechanism for measurement service delivery : Analytical measurement and MRC DMR 380
  • Reference value assignment of VOC to PT and CRMs
  • Approved on 20 July 2020
  • Institute service identifier : 630-Q021-026
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty in % Mass fraction in % Relative expanded uncertainty in %
1-pentanol 1-pentanol 98 to 100 0.22 99.74 to 99.84 0.22
  • Mechanism for measurement service delivery : Analytical services, DMR-165 x, DMR-380 x, DMR-480 x, DMR-517 x. Some of these reference materials are used as a primary reference material for preparing internal solutions.
  • Approved on 17 May 2020
  • Institute service identifier : 630-C014-013
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty in % Mass fraction in % Relative expanded uncertainty in %
1-propanol 1-propanol 98 to 100 0.22 99.74 to 99.84 0.22
  • Mechanism for measurement service delivery : Analytical services,DMR-418 x, DMR-165 x, DMR-380 x, DMR-480 x, DMR-517 x. Some of these reference materials are used as a primary reference material for preparing internal solutions.
  • Approved on 17 May 2020
  • Institute service identifier : 630-C014-011
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in mg/g Relative expanded uncertainty in % Mass fraction in mg/g Relative expanded uncertainty in %
Multi-component ethanol/water solution 1-propanol 1 to 8 3 to 2 6 to 6.5 3 to 2
  • Mechanism for measurement service delivery : Analytical measurement and MRC DMR 380
  • Reference value assignment of VOC to PT and CRMs
  • Approved on 20 July 2020
  • Institute service identifier : 630-Q021-024
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in ng/g Relative expanded uncertainty in % Mass fraction in µg/g Relative expanded uncertainty in %
organic solution, multi-component 2,4'-DDD 100 to 1.00E5 7 to 1 3.29 3.2
  • Mechanism for measurement service delivery : DMR 277a
  • Reference value assignment of COPs in Calibration, solutions and matrix CRMs, and in PT´s services
  • Approved on 20 July 2020
  • Institute service identifier : 630-Q021.017
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty in % Mass fraction in % Relative expanded uncertainty in %
2,4'-DDD 2,4'-DDD 98 to 100 5.3 99.33 to 99.34 5.3
  • Mechanism for measurement service delivery : Analytical services, DMR-277. Some of these reference materials are used as a primary reference material for preparing internal solutions.
  • Approved on 17 May 2020
  • Institute service identifier : 630-C014-048
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty in % Mass fraction in % Relative expanded uncertainty in %
2,4'-DDE 2,4'-DDE 98 to 100 5.3 99.78 to 99.79 5.3
  • Mechanism for measurement service delivery : Analytical services, DMR-277. Some of these reference materials are used as a primary reference material for preparing internal solutions.
  • Approved on 17 May 2020
  • Institute service identifier : 630-C014-047
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in ng/g Relative expanded uncertainty in % Mass fraction in
organic solution, multi-component 2,4'-DDE 100 to 1.00E5 2.2 to 1.0E1
  • Mechanism for measurement service delivery : Analytical services, PT 630-IL-1203
  • Reference value assignment of COPs in Calibration, solutions and matrix CRMs, and in PT´s services
  • Approved on 20 July 2020
  • Institute service identifier : 630-Q021-004
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in % Relative expanded uncertainty in % Mass fraction in % Relative expanded uncertainty in %
2,4'-DDT 2,4'-DDT 98 to 100 0.5 99.98 to 99.99 0.5
  • Mechanism for measurement service delivery : Analytical services, DMR-277. Some of these reference materials are used as a primary reference material for preparing internal solutions.
  • Approved on 17 May 2020
  • Institute service identifier : 630-C014-050

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