Colección INTI-SNRD


Título: Key comparison CCQM-K73 amount content of H+ in hydrochloric acid (0.1 mol·kg-1)
Fuente: Metrología, 50
Autor/es: Pratt, Kenneth W.; Ortiz-Aparicio, Jose Luis; Matehuala-Sanchez, Francisco Javier; Pawlina, Monika; Kozłowski, Władysław; Borges, Paulo P.; da Silva Junior, Wiler B.; Borinsky, Mónica B.; Hernandez, Ana; Puelles, Mabel; Hatamleh, Nadia; Acosta, Osvaldo; Nunes, João; Guiomar Lito, M. J.; Camões, M. Filomena; Filipe, Eduarda; Hwang, Euijin; Lim, Youngran; Bing, Wu; Qian, Wang; Chao, Wei; Hioki, Akiharu; Asakai, Toshiaki; Máriássy, Michal; Hanková, Zuzana; Nagibin, Sergey; Manska, Olexandra; Gavrilkin, Vladimir; Kutovoy, Viatcheslav
Materias: Metrología; Ácido clorhídrico; Hidrógeno; Cationes; Determinación (química); Incertidumbre; Dispersión
Editor/Edición: IOP Publishing; 2013
Licencia: https://creativecommons.org/licenses/by/3.0/
Afiliaciones: Pratt, Kenneth W. National Institute of Standards and Technology (NIST); Estados Unidos
Ortiz-Aparicio, Jose Luis. Centro Nacional de Metrología (CENAM); México
Matehuala-Sanchez, Francisco Javier. Centro Nacional de Metrología (CENAM); México
Jakobsen, Pia Tønnes. Dansk Fundamental Metrology (DFM); Dinamarca
Pawlina, Monika. Główny Urząd Miar (GUM); Polonia
Kozłowski, Władysław. Główny Urząd Miar (GUM); Polonia
Borges, Paulo P. Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMetro); Brasil
da Silva Junior, Wiler B. Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMetro); Brasil
Borinsky, Mónica B. Instituto Nacional de Tecnología Industrial (INTI); Argentina
Hernandez, Ana. Instituto Nacional de Tecnología Industrial (INTI); Argentina
Puelles, Mabel. Instituto Nacional de Tecnología Industrial (INTI); Argentina
Hatamleh, Nadia. Instituto Nacional de Tecnología Industrial (INTI); Argentina
Acosta, Osvaldo. Instituto Nacional de Tecnología Industrial (INTI); Argentina
Nunes, João. Instituto Português da Qualidade (IPQ); Portugal
Guiomar Lito, M. J. Instituto Português da Qualidade (IPQ); Portugal
Camões, M. Filomena. Instituto Português da Qualidade (IPQ); Portugal
Filipe, Eduarda. Instituto Português da Qualidade (IPQ); Portugal
Hwang, Euijin. Korea Research Institute of Standards and Science (KRISS); Corea del Sur
Lim, Youngran. Korea Research Institute of Standards and Science (KRISS); Corea del Sur
Bing, Wu. National Institute of Metrology (NIM); China
Qian, Wang. National Institute of Metrology (NIM); China
Chao, Wei. National Institute of Metrology (NIM); China
Hioki, Akiharu. National Metrology Institute of Japan (NMIJ); Japón
Asakai, Toshiaki. National Metrology Institute of Japan (NMIJ); Japón
Máriássy, Michal. Slovenský Metrologický Ústav (SMU); Eslovaquia
Hanková, Zuzana. Slovenský Metrologický Ústav (SMU); Eslovaquia
Nagibin, Sergey. Ukrainian State Research and Production Center of Standardization Metrology, Certification, and Consumers’ Rights Protection (UMTS); Ucrania
Manska, Olexandra. Ukrainian State Research and Production Center of Standardization Metrology, Certification, and Consumers’ Rights Protection (UMTS); Ucrania
Gavrilkin, Vladimir. Ukrainian State Research and Production Center of Standardization Metrology, Certification, and Consumers’ Rights Protection (UMTS); Ucrania
Kutovoy, Viatcheslav. All-Russian Scientific Institute for Physical-Technical and Radiological Measurements (VNIIFTRI); Rusia

Resumen: This key comparison (KC), CCQM-K73, was performed to demonstrate the capability of the participating National Metrology Institutes (NMIs) to measure the amount content of H+ , νH + , in an HCl solution with a nominal νH + of 0.1 mol·kg-1 . A parallel Pilot Study, CCQM-P19.2, was performed for NMIs that did not desire to participate in the KC. The comparison was a joint activity of the Electrochemical Working Group (EAWG) and Inorganic Analysis Working Group (IAWG) of the CCQM and was coordinated by NIST (USA) and CENAM (México). The method of determination of νH + was left to the individual participant. All participants used either coulometry or titrimetry with potentiometric determination of the endpoint. The agreement of the results was not commensurate with the claimed uncertainties of the subset of participants that claimed small uncertainties for this determination. A workshop on technical issues relating to the CCQM-K73 measurements was conducted at the joint IAWGEAWG meeting at the Bureau International des Poids et Mesures (BIPM), Paris (Sèvres) in April 2010. Several possible sources of bias were investigated, but none could explain the observed dispersion among the participants’ results. In the absence of a specific cause for the dispersion, the IAWG and EAWG decided to assign a Key Comparison Reference Value, KCRV, and standard uncertainty of the KCRV, uKCRV, based on the DerSimonian-Laird statistical estimator. The uKCRV is dominated by the between-laboratory scatter of results in CCQM-K73. The uncertainty estimates from the participants with the lowest reported uncertainties remain unsupported by this KC.
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