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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)
Thailand, NIMT (National Institute of Metrology (Thailand))
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 6.85 to 6.9 6.0E-3 to 9.0E-3 6.85 to 6.9 6.0E-3 to 9.0E-3
  • Mechanism for measurement service delivery : TRM-S-2021
  • Harned cell was used as a measurment method
  • Approved on 23 October 2019
  • Institute service identifier : 12031-20110
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 4.02 5.0E-3 to 8.0E-3 3.99 to 4.02 5.3E-3 to 8.0E-3
  • Mechanism for measurement service delivery : TRM-S-2020
  • Harned cell system was used as a measurment method
  • Approved on 23 October 2019
  • Institute service identifier : 12031-10104
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 buffer solution 9.95 to 10.04 6.0E-3 9.95 to 10.04 7.3E-3
  • Mechanism for measurement service delivery : TRM-S-2030
  • Harned cell was used as a measurment method
  • Approved on 23 October 2019
  • Institute service identifier : 12031-20120
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 Absolute expanded uncertainty in
drinking water, fresh water arsenic 5.00E-3 to 10 3.5 to 4
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples
  • Approved on 30 August 2017
  • Institute service identifier : 12022-60104
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 Absolute expanded uncertainty in
polypropylene, polyethylene and polyvinyl chloride arsenic 10 to 100 5 to 6
  • Mechanism for measurement service delivery : Provision of reference values for PT/RM samples
  • Approved on 19 June 2014
  • Institute service identifier : 12021-60102
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 % Absolute expanded uncertainty in %
Biological Tissues arsenic 0.01 to 100 4.5 to 1.8E1
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples.
  • Approved on 30 June 2022
  • Institute service identifier : 12023-60102
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 Absolute expanded uncertainty in
cosmetic cream arsenic 1 to 10 4.5 to 5
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples
  • Approved on 20 January 2016
  • Institute service identifier : 12021-60101
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 % Absolute expanded uncertainty in %
leather arsenic 30 to 100 4.4 to 6
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples.
  • Approved on 30 June 2022
  • Institute service identifier : 12023-60102
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 Absolute expanded uncertainty in
cereal and cereal products arsenic 0.05 to 1 7 to 7.5
  • Mechanism for measurement service delivery : Provision of reference values for both in-house and external PT/RM samples
  • Approved on 30 August 2017
  • Institute service identifier : 12021-60105
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 % Absolute expanded uncertainty in %
Meat products arsenic 0.01 to 100 4.5 to 1.8E1
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples.
  • Approved on 30 June 2022
  • Institute service identifier : 12023-60102
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 Absolute expanded uncertainty in
botanical materials arsenic (total) 0.5 to 100 7 to 7.5
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples
  • Approved on 19 June 2014
  • Institute service identifier : 12021-60101
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 Absolute expanded uncertainty in
seafood arsenic (total) 10 to 100 4.5 to 5.5
  • Mechanism for measurement service delivery : Provision of reference values for both in- house and external PT/RM samples
  • Approved on 13 June 2013
  • Institute service identifier : 12021-60104
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
high Purity Avermectin avermectin B1a 900 to 1000 1 to 2
  • Mechanism for measurement service delivery : Reference value for primary calibrants and reference materials
  • Approved on 23 October 2019
  • Institute service identifier : 12011-60103
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 Absolute expanded uncertainty in
cereal and cereal products cadmium 0.1 to 0.5 4.6 to 5
  • Mechanism for measurement service delivery : Provision of reference values for both in-house and external PT/RM samples
  • Approved on 20 January 2016
  • Institute service identifier : 12021-60211
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 Absolute expanded uncertainty in
soybean and soybean powder cadmium 0.1 to 1 3.5 to 4
  • Mechanism for measurement service delivery : Provision of reference values for PT schemes and reference material producer
  • Approved on 06 September 2012
  • Institute service identifier : 12020-60206
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 Absolute expanded uncertainty in
poly(acrylonitrile butadiene styrene) and polystyrene cadmium 1 to 100 1.5 to 2
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples
  • Approved on 19 June 2014
  • Institute service identifier : 12021-60210
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 Absolute expanded uncertainty in
drinking water, fresh water cadmium 1.00E-3 to 1 4.5 to 5
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples
  • Approved on 30 August 2017
  • Institute service identifier : 12022-60304
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 Absolute expanded uncertainty in
rice and rice flour cadmium 0.1 to 1 3.5 to 4
  • Mechanism for measurement service delivery : Provision of reference values for PT schemes and reference material producer
  • Approved on 06 September 2012
  • Institute service identifier : 12020-60205
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 % Absolute expanded uncertainty in %
leather cadmium 30 to 100 2.2 to 8
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples.
  • Approved on 30 June 2022
  • Institute service identifier : 12023-60101
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 Absolute expanded uncertainty in
polypropylene, polyethylene and polyvinyl chloride cadmium 1 to 100 1.5 to 2
  • Mechanism for measurement service delivery : Provision of reference values for both PT and RM samples
  • Approved on 19 June 2014
  • Institute service identifier : 12020-60210

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