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| Tipo de Docum.: | artículo |
| Título: | Key comparison CCQM-K73 amount content of H+ in hydrochloric acid (0.1 mol·kg-1) |
| Autor: | 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 |
| Título Ser./Col.: | Metrología, 50 |
| Autor Inst. Ser./Col.: | Bureau International des Poids et Mesures. BIPM. Paris. FR |
| Idioma: | eng |
| Datos de Edición: | s.l. IOP Publishing. 2013. |
| Pág./Vol.: | 22p. |
| Descriptores: | Metrología; Ácido clorhídrico; Hidrógeno; Cationes; Determinación (química); Incertidumbre; Dispersión |
| 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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URL: |
https://iopscience.iop.org/article/10.1088/0026-1394/50/1A/08001 |
| Tipo de Docum.: | artículo |
| Título: | Report of the CCQM-K130 : Nitrogen mass fraction measurements in glycine |
| Autor: | Medvedevskikh, Maria; Jury, Bessonov; Krasheninina, Maria; Acco Garcia, Steve Ali; Haraldsson, Conny; Rodriguez, M. Alejandra; Rodriguez, Gabriela; Salvo, Karino; Gavrilkin, Vladimir; Kulik, Sergey; Samuel, Laly; do Rego, Eliane C. P.; Wollinger, Wagner; Monteiro, Tânia M.; de Carvalho, Lucas J. |
| Título Ser./Col.: | Metrología, 54(1A) |
| Autor Inst. Ser./Col.: | Bureau International des Poids et Mesures. BIPM. Paris. FR |
| Idioma: | eng |
| Datos de Edición: | s.l. IOP Publishing. 2017. |
| Pág./Vol.: | 21p. |
| Descriptores: | Mediciones; Metrología; Masa; Nitrógeno; Leche en polvo; Alimentos; Materias primas; Proteínas; Encimas; Aminoácidos |
| Resumen: | Mass fraction of nitrogen is very important pointer because the results of these measurements are often used for determination of protein mass fraction that is an important indicator of the quality of the vast majority of food products and raw materials, in particular dry milk powder. Proteins-enzymes catalyze chemical reactions, protein along with fats and carbohydrates is one of the indicators characterizing the energy value of food, so its definition is mandatory for all food products. The aim of this key comparison CCQM-K130 and pilot study P166 is to support National Measurement Institutes (NMIs) and Designated Institutes (DIs) to demonstrate the validity of the procedures the employed for determination of nitrogen mass fraction in glycine. The study material for this key comparison and pilot study has been selected to be representative as one of the aminoacid – the simplest part of the protein. Glycine is an amino acid, single acid that does not have any isomers (melting point –290 °C; specific heat of evaporation − 528,6 J/kg; specific melting heat − 981,1 J/kg; pKa − 2,34, molar mass - 75,07 g/mol, density - 1,607 g/cm3). Ural Scientific Research Institute for Metrology (UNIIM) acted as the coordinating laboratory of this comparison and pilot study. Eight NMIs participated in this key comparison and two NMIs participated in Pilot study. The results of Pilot study are excluded from the Report B. |
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URL: |
https://ui.adsabs.harvard.edu/abs/2017Metro..54.8004M/abstract |
| Tipo de Docum.: | informe |
| Título: | Key Comparison CCQM-K73 amount content of H+ in hydrochloric acid (0.1 mol·kg-1); Final Report: 26 October 2012 |
| Autor: | Pratt, Kenneth W.. coord.; Ortiz-Aparicio, Jose Luis; Matehuala-Sanchez, Francisco Javier; Pawlina, Monika; Kozłowski, Władysław; Borges, Paulo P.; Silva, Wiler B. da; 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 |
| Autor Instit.: | Centro Nacional de Metrología. CENAM. MX; Dansk Fundamental Metrology. DFM. DK; Główny Urząd Miar. GUM. PL; Instituto Nacional de Metrologia, Normalização e Qualidade Industrial. INMETRO. BR; INTI-Química. Buenos Aires. AR; Instituto Português da Qualidade - Scientific and Applied Metrology Unit. IPQ/UMCA-LCM. PT; Korea Research Institute of Standards and Science. KRISS. KR; National Institute of Metrology of P. R. China. NIM. CN; National Institute of Standards and Technology. NIST. US; National Metrology Institute of Japan. NMIJ. JP; Slovenský Metrologický Ústav. SMU. SK; Ukrainian State Research and Production Center of Standardization Metrology, Certification, and Consumers’ Rights Protection. UMTS. UA; All-Russian Scientific Institute for Physical-Technical and Radiological Measurements. VNIIFTRI. RU |
| Idioma: | eng |
| Datos de Edición: | Gaithersburg. US. NIST. 2012. |
| Pág./Vol.: | 22p. |
| Unidad técnica: | INTI-Quimica. |
| Descriptores: | Metrología química; Acido clorhídrico; Hidrógeno; Soluciones ácidas; Métodos de determinación; Mediciones; Incertidumbre; Análisis volumétrico; Homogeneidad; Estabilidad; Trazabilidad; Técnicas estadísticas; Errores; Impurezas |
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