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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)
Bulgaria, BIM (Bulgarian Institute of Metrology)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in mg/kg Relative expanded uncertainty in % Mass fraction in
blood serum copper 1 to 50 4.2 to 5
  • Mechanism for measurement service delivery : Reference measurement service and reference value assignment for PT
  • Approved on 15 October 2019
  • Institute service identifier : CHM 10
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 3.6 to 4.2 5.0E-3 3.6 to 4.2 5.0E-3
  • Mechanism for measurement service delivery : Calibration services, value assignment of CRMs - CRM NCM 5.302 (pH 3.556) and CRM NCM 5.304 (pH 4.008); value assignment for proficiency testing scheme samples
  • Temperature range for calibration service: 20 °C to 40 °C, values given for 25 ºC. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention (~ 0.010, k = 2)
  • Approved on 06 December 2011
  • Institute service identifier : 1.6.a-2
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 9.8 to 10.2 8.0E-3 9.8 to 10.02 1.0E-2
  • Mechanism for measurement service delivery : Calibration services, value assignment of CRMs - CRM NCM 5.308 (pH 10.012); value assignment for proficiency testing scheme samples
  • Temperature range for calibration service: 20 °C to 40 °C, values given for 25 ºC. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention (~ 0.010, k = 2)
  • Approved on 06 December 2011
  • Institute service identifier : 1.6.c-2
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 1.5 to 1.9 1.0E-2 1.5 to 1.9 1.0E-2
  • Mechanism for measurement service delivery : Calibration services, value assignment of CRMs - CRM NCM 5.301 (pH 1.679); value assignment for proficiency testing scheme samples
  • Temperature range for calibration service: 20 °C to 40 °C, values given for 25 ºC. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention (~ 0.010, k = 2)
  • Approved on 06 December 2011
  • Institute service identifier : 1.6.a-1
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 6.7 to 7.6 4.0E-3 6.7 to 7.6 4.0E-3
  • Mechanism for measurement service delivery : Calibration services, value assignment of CRMs - CRM NCM 5.305 (pH 6.865) and CRM NCM 5.306 (pH 7.413); value assignment for proficiency testing scheme samples
  • Temperature range for calibration service: 20 °C to 40 °C, values given for 25 ºC. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention (~ 0.010, k = 2)
  • Approved on 06 December 2011
  • Institute service identifier : 1.6.b-1
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 9.4 4.0E-3 9 to 9.4 5.0E-3
  • Mechanism for measurement service delivery : Calibration services, value assignment of CRMs - CRM NCM 5.307 (pH 9.180); value assignment for proficiency testing scheme samples
  • Temperature range for calibration service: 20 °C to 40 °C, values given for 25 ºC. Declared uncertainties do not include the uncertainty contribution due to the Bates-Guggenheim convention (~ 0.010, k = 2)
  • Approved on 06 December 2011
  • Institute service identifier : 1.6.c-1

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