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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)
United States, NIST (National Institute of Standards and Technology)
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 1.6E-3 9.93 to 10.18 1.0E-2
  • Mechanism for measurement service delivery : SRM 191d
  • Carbonate buffer. Temperature range for certification, 10 °C to 35 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention. Uncertainties of reference values in CRM certificates do not include uncertainty of Bates-Guggenheim Convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393605
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 6.4 to 7.4 1.5E-2 6.52 to 7.27 1.5E-2
  • Mechanism for measurement service delivery : SRM 2183
  • MOPSO zwitterionic buffer. Temperature range for certification, 5 °C to 50 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393607
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 6.4 to 7.6 1.0E-3 to 4.2E-3 6.84 to 6.98 1.0E-2
  • Mechanism for measurement service delivery : SRM 186f
  • Phosphate buffer. Temperature range for certification, 5 °C to 50 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention. Uncertainties of reference values in CRM certificates do not include uncertainty of Bates-Guggenheim Convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393602
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 11.9 to 12.9 5.0E-3 to 1.5E-2 11.71 to 13.42 2.0E-2
  • Mechanism for measurement service delivery : SRM 2193a
  • Calcium hydroxide buffer. Temperature range for certification, 5 °C to 50 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention. Uncertainties of reference values in CRM certificates do not include uncertainty of Bates-Guggenheim Convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393606
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 1.2 to 2.2 1.0E-3 1.67 to 1.71 1.0E-2
  • Mechanism for measurement service delivery : SRM 189c
  • Tetroxalate buffer. Temperature range for certification, 5 °C to 50 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention. Uncertainties of reference values in CRM certificates do not include uncertainty of Bates-Guggenheim Convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393600
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 to 9.5 3.1E-3 to 1.1E-2 9.01 to 9.39 1.0E-2
  • Mechanism for measurement service delivery : SRM 187e
  • Borate buffer. Temperature range for certification, 5 °C to 50 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention. Uncertainties of reference values in CRM certificates do not include uncertainty of Bates-Guggenheim Convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393604
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 7 to 8 1.0E-2 to 1.5E-2 7.22 to 7.85 1.0E-2 to 1.5E-2
  • Mechanism for measurement service delivery : SRM 2181
  • HEPES zwitterionic buffer. Temperature range for certification, 5 °C to 50 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393608
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 1.6 to 12.9 2.0E-3 to 5.0E-2
  • Mechanism for measurement service delivery : Analytical service
  • Two- or multi-point calibration. Calibrants: Buffers from CMCs 8393600 through 8393606. Minimum uncertainty value in stated uncertainty range applies to samples with nominal composition identical to one calibrant SRM
  • Approved on 31 March 2012
  • Institute service identifier : 8393609
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 3.5 to 4.5 1.4E-3 4 to 4.06 1.0E-2
  • Mechanism for measurement service delivery : SRM 185h
  • Phthalate buffer. Temperature range for certification, 5 °C to 50 °C. Uncertainties of certified values in CRM certificates include uncertainty of Bates-Guggenheim convention. Uncertainties of reference values in CRM certificates do not include uncertainty of Bates-Guggenheim Convention
  • Approved on 31 March 2012
  • Institute service identifier : 8393601
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in %
air 1,1,1,2-tetrafluoroethane (HFC-134a) 0.05 to 1.00E4 3.5 to 2 0.06 to 1.00E4 3.5 to 2
  • Mechanism for measurement service delivery : SRM 1722
  • Approved on 21 October 2015
  • Institute service identifier : 8394005
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in pmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in pmol/mol Relative expanded uncertainty in %
nitrogen or air 1,1,2-trichlorotrifluoroethane (CFC-113) 50 to 1.00E7 0.5 50 to 1.00E4 2 to 1
  • Mechanism for measurement service delivery : SRM 1722
  • Approved on 21 October 2015
  • Institute service identifier : 8393076
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in pmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in %
nitrogen or air 1,2-dichlorotetrafluoroethane (CFC-114) 20 to 1.00E7 2.5 to 0.5 5 to 1000 5 to 2
  • Mechanism for measurement service delivery : SRM 1804
  • Approved on 21 October 2015
  • Institute service identifier : 8393047R
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in %
air 1-chloro-1,1-difluoroethane (HCFC-142b) 0.015 to 1.00E4 3.5 to 2 0.02 to 1.00E4 3.5 to 2
  • Mechanism for measurement service delivery : SRM 1722
  • Approved on 21 October 2015
  • Institute service identifier : 8394004
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in %
nitrogen 1-pentene 0.1 to 2000 1 to 1.0E1 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1800
  • Approved on 12 June 2007
  • Institute service identifier : 8393041
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 ng/g Absolute expanded uncertainty in ng/g
single component organic solution 24,25-hydroxyvitmain D3 100 to 2000 1.3 to 5 1054.4 1.9E1
  • Mechanism for measurement service delivery : SRM 2972a
  • Approved on 20 July 2020
  • Institute service identifier : Org3_3
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 ng/g Absolute expanded uncertainty in ng/g
single component organic solution 25-hydroxyvitamin D2 100 to 2000 1.3 to 5 293.6 9.1
  • Mechanism for measurement service delivery : SRM 2972a
  • Approved on 20 July 2020
  • Institute service identifier : Org3_3
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 ng/g Absolute expanded uncertainty in ng/g
single component organic solution 25-hydroxyvitamin D3 100 to 2000 1.3 to 5 410 to 812 1.5E1 to 2.9E1
  • Mechanism for measurement service delivery : SRM 2972a
  • Approved on 20 July 2020
  • Institute service identifier : Org3_3
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 ng/g Absolute expanded uncertainty in ng/g
single component organic solution 3-epi-25-hydroxyvitmain D3 200 to 2000 1.3 to 5 293.4 1.4E1
  • Mechanism for measurement service delivery : SRM 2972a
  • Approved on 20 July 2020
  • Institute service identifier : Org3_3
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in nmol/mol Absolute expanded uncertainty in % Amount-of-substance fraction in Absolute expanded uncertainty in
nitrogen alpha-pinene 1 to 2000 1 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California
  • Approved on 12 June 2007
  • Institute service identifier : 8393106
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 in % Mass fraction in mg/kg Absolute expanded uncertainty in mg/kg
coke aluminum 10 to 100 2 to 1.2E1 16.5 to 58.9 1.8 to 5.7
  • Mechanism for measurement service delivery : SRM 2718, SRM 2719
  • Approved on 27 March 2013
  • Institute service identifier : 8391400

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