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Chemical Analyte
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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)
Costa Rica, LACOMET (Laboratorio Costarricense de Metrologia)
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 mg/kg Mass fraction in
natural water, synthetic water, acid solution (up 10 %) potassium 0.14 to 1.00E4 1.1E-2 to 1.5E2
  • Mechanism for measurement service delivery : Assigning values to PT scheme samples, internal calibration
  • Approved on 23 October 2019
  • Institute service identifier : 13.1.0.1.3, 32.1.0.0.1 and 34.1.0.0.1
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 mg/kg Mass fraction in
natural water, synthetic water, acid solution (up 10 %) sodium 0.15 to 1000 1.5E-2 to 3.0E1
  • Mechanism for measurement service delivery : Assigning values to PT scheme samples, internal calibration
  • Approved on 23 October 2019
  • Institute service identifier : 13.1.0.1.3, 32.1.0.0.1 and 34.1.0.0.1
Mass , Conventional mass : 20 g
Mass standard
Absolute expanded uncertainty : 2.7E-2 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 5 mg
Mass standard
Absolute expanded uncertainty : 2.0E-3 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 10 g
Mass standard
Absolute expanded uncertainty : 2.0E-2 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Fluid flow , Volume of liquid : 5 L to 19 L
Volumetric test measure (graduated neck type)
Relative expanded uncertainty : 4.0E-2 % to 2.0E-2 %
Gravimetric determination
Air temperature : 18 °C to 24 °C
Liquid : water
Water temperature : 18 °C to 24 °C
Density formula according to Metrologia, 38, 2001, 301-309 The density formula is used with corrections for air-saturated water and compressibility
Approved on 18 October 2019
Institute service identifier : 4.9.9.5.1
Fluid flow , Volume of liquid : 1 mL to 100 mL
Volumetric test measure (one mark pipette)
Absolute expanded uncertainty : 3.2E-3 mL to 2.4E-2 mL
0.00021V + 0.003 V in mL
Gravimetric determination
Air temperature : 18 °C to 24 °C
Liquid : water
Water temperature : 18 °C to 24 °C
Density formula according to Metrologia, 38, 2001, 301-309 The density formula is used with corrections for air-saturated water and compressibility
Approved on 18 October 2019
Institute service identifier : 4.3.9.5.1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -20 °C to 50 °C
Thermistors
Absolute expanded uncertainty : 8 mK
Comparison stirred alcohol and water baths
Temperature : 20 °C ± 2 °C
Relative humidity : 55 % ± 10 %/rh
Approved on 17 January 2013
Institute service identifier : LACOMET-02-2.2.3
Mass , Conventional mass : 50 kg
Mass standard
Absolute expanded uncertainty : 5.0E1 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 1 g
Mass standard
Absolute expanded uncertainty : 1.0E-2 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 100 mg
Mass standard
Absolute expanded uncertainty : 5.0E-3 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 500 mg
Mass standard
Absolute expanded uncertainty : 8.0E-3 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 100 g
Mass standard
Absolute expanded uncertainty : 5.3E-2 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 2 g
Mass standard
Absolute expanded uncertainty : 1.3E-2 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 500 g
Mass standard
Absolute expanded uncertainty : 0.27 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 20 kg
Mass standard
Absolute expanded uncertainty : 2.0E1 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 50 mg
Mass standard
Absolute expanded uncertainty : 4.0E-3 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Mass , Conventional mass : 1 mg
Mass standard
Absolute expanded uncertainty : 2.0E-3 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01
Hygrometers , Humidity : -30 °C to 20 °C
Dew-point hygrometer
Absolute expanded uncertainty : 9.0E-2 °C
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Direct measurement
Temperature : 21 °C ± 2 °C
Relative humidity : 55 % ± 5 %
Approved on 25 February 2022
Institute service identifier : LACOMET 10.1.3.1.1
Mass , Conventional mass : 200 mg
Mass standard
Absolute expanded uncertainty : 7.0E-3 mg
Direct comparison
Temperature : 19 ºC to 21 ºC
Relative humidity : 45 % to 60 %
Approved on 26 November 2008
Institute service identifier : LACOMET/MF-MA-PR-01

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