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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 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 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 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 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 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 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 nmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in %
nitrogen 1,1,1-trichloroethane 0.01 to 5.00E5 1 to 5 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1804
  • Approved on 12 June 2007
  • Institute service identifier : 8393056
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 1,1,2,2-tetrachloroethane 0.1 to 5.00E5 1 to 5 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1804
  • Approved on 12 June 2007
  • Institute service identifier : 8393063
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 1,1,2-trichloroethane 0.1 to 5.00E5 1 to 5 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1804
  • Approved on 12 June 2007
  • Institute service identifier : 8393060
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 nmol/mol Relative expanded uncertainty in % Amount-of-substance fraction in nmol/mol Relative expanded uncertainty in %
nitrogen 1,1-dichloroethane 1 to 5000 1 to 5 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1804
  • Approved on 12 June 2007
  • Institute service identifier : 8393053R
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 1,1-dichloroethene 1 to 5000 1 to 5 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1804
  • Approved on 12 June 2007
  • Institute service identifier : 8393051R
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 1,2,3-trimethylbenzene 1 to 1.00E5 1 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California
  • Approved on 12 June 2007
  • Institute service identifier : 8393103
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 1,2,4-trichlorobenzene 1 to 1.00E5 1 to 5 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1804
  • Approved on 12 June 2007
  • Institute service identifier : 8393068
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 1,2,4-trimethylbenzene 0.5 to 1.00E5 1 to 5 5 2 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California, SRM 1804
  • Approved on 12 June 2007
  • Institute service identifier : 8393065R
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 1,2-dibromoethane 0.5 to 2.00E5 1 to 5
  • Mechanism for measurement service delivery : NIST RM for State of California
  • Approved on 12 June 2007
  • Institute service identifier : 8393073

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