Metrological traceability of measurement results in chemistry: Concepts and implementation (IUPAC Technical Report)

Bièvre, Paul De; Dybkær, René; Fajgelj, A.; Hibbert, David Brynn

doi:10.1351/pac-rep-07-09-39

Cited by 140 publications

(98 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Metrological traceability scheme for qNMR According to De Bièvre et al [16], a metrological traceability scheme as shown in Fig. 1 can be drawn.…”

Section: Resultsmentioning

confidence: 99%

Using high-performance quantitative NMR (HP-qNMR®) for certifying traceable and highly accurate purity values of organic reference materials with uncertainties <0.1 %

Weber¹,

Hellriegel²,

Rück³

et al. 2013

Accred Qual Assur

View full text Add to dashboard Cite

Quantitative nuclear magnetic resonance (qNMR) in combination with metrological weighing is optimised to demonstrate the power of the qNMR measurement method. It is shown that with 1 H-qNMR it is possible to certify the purity of organic reference materials (expressed as mass fraction) with relative expanded uncertainties of \0.1 % for a 95 % confidence interval (k = 2). Following well-defined selection criteria, a set of twelve different chemical compounds is evaluated and certified to serve as internal references for 1 H-qNMR measurements. A series of comparison measurements is made amongst a subset of the selected compounds. The purity of maleic acid is determined by six different 1 H-qNMR measurement series, and all results show full consistency. All the six mean values are covered within the range of ±0.05 %. In two more measurement series, four different nuclei are analysed within the same sample against one calibrator. Even with non-optimised signal intensity ratios and varying signal pattern, a high consistency was obtained. Therefore, the validity and robustness of 1 H-qNMR measurement results are demonstrated. 1 H-qNMR measurement results are directly traceable to a variety of internationally accepted primary reference materials, and therefore, traceability to SI units is obtained. All experiments are performed under ISO/IEC 17025 and ISO Guide 34 accreditation.

show abstract

“…Metrological traceability scheme for qNMR According to De Bièvre et al [16], a metrological traceability scheme as shown in Fig. 1 can be drawn.…”

Section: Resultsmentioning

confidence: 99%

Using high-performance quantitative NMR (HP-qNMR®) for certifying traceable and highly accurate purity values of organic reference materials with uncertainties <0.1 %

Weber¹,

Hellriegel²,

Rück³

et al. 2013

Accred Qual Assur

View full text Add to dashboard Cite

show abstract

“…Since the value of this term is invariant among the participants of each KC, all measurement-specific factors that affect the pa 0 affect the corresponding pH values (as well as any KCRV calculated from them) to the same extent. The uncertainty [15] Note that primary pH is a procedurally defined kind-ofquantity [19]. Since primary pH cannot be determined except through the measurement process itself, the KCRV for a primary pH KC must be estimated from the measurement results even though the study materials are prepared quantitatively from materials of established composition.…”

Section: Primary Methods Ph Measurementsmentioning

confidence: 99%

“Degrees of equivalence” for chemical measurement capabilities: primary pH

Duewer

Pratt

Cherdchu³

et al. 2014

Accred Qual Assur

View full text Add to dashboard Cite

The key comparison (KC) studies of the Consultative Committee for Amount of Substance-Metrology in Chemistry help ensure the reliability of chemical and biochemical measurements relevant to international trade and environmental-, health-, and safety-related decision making. The traditional final evaluation of each measurement result reported by a KC participant is a ''degree of equivalence'' (DEq) that quantitatively specifies how consistent each individual result is relative to a reference value. Recognizing the impossibility of conducting separate KCs for all important analytes in all important sample matrices at all important analyte levels, emphasis is now shifting to documenting broadly applicable critical or ''core'' measurement competencies elicited through a series of studies. To better accomplish the necessary synthesis of results, data analysis and display tools must be developed for objectively and quantitatively combining individual DEqs. The information detailed in the 11 KCs of primary method pH measurements publically available as of 2013 provides an excellent ''best case'' prototype for such analysis. We here propose tools that enable documenting the expected primary pH measurement performance of individual participants between pH 1 and pH 11 and from 15°C to 37°C. These tools may prove useful for other areas where the uncertainty of measurement is a predictable function of the measured quantity, such as the stable gases. That results for relatively simple measurement processes can be combined using relatively simple analysis and display methods does not ensure that similarly meaningful summaries can be devised for less well understood and controlled systems, but it provides the incentive to attempt to do so.

show abstract

“…The metrological chain of measurement starts with a preparation of a primary calibrator (standard) with an assigned property value [8]. This is then used to calibrate the measuring system.…”

Section: Calibrationmentioning

confidence: 99%

Calibration of isotope amount ratios by analysis of isotope mixtures

Meija

2012

Anal Bioanal Chem

View full text Add to dashboard Cite

Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=5b75dff8-00e4-4f2b-bacf-77fa70767efd http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=5b75dff8-00e4-4f2b-bacf-77fa70767efdCalibration of isotope amount ratios by analysis of isotope mixtures Juris MeijaMeasurement Science and Standards, National Research Council Canada, 1200 Montreal Road, Ottawa ON K1A 0R6, Canada E-mail: juris.meija@nrc-cnrc.gc.caAbstract. The question as to what constitutes a fully calibrated isotope amount ratio measurement still remains a topic of active research. For years, the definitive calibration approach has been by means of synthetic mixtures of highly enriched isotopes with known chemical purity to give gravimetrically defined ratios. This article outlines the core concepts and assumptions of this method and illustrates the recent developments in the practical metrology of isotope amount ratio measurements.

show abstract

Metrological traceability of measurement results in chemistry: Concepts and implementation (IUPAC Technical Report)

Cited by 140 publications

References 21 publications

Using high-performance quantitative NMR (HP-qNMR®) for certifying traceable and highly accurate purity values of organic reference materials with uncertainties <0.1 %

Using high-performance quantitative NMR (HP-qNMR®) for certifying traceable and highly accurate purity values of organic reference materials with uncertainties <0.1 %

“Degrees of equivalence” for chemical measurement capabilities: primary pH

Calibration of isotope amount ratios by analysis of isotope mixtures

Contact Info

Product

Resources

About