<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>31072</id>
    <completedYear/>
    <publishedYear>2014</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>08010, 1</pageFirst>
    <pageLast>44</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>51</volume>
    <type>article</type>
    <publisherName>Inst. of Physics Publ.</publisherName>
    <publisherPlace>Bristol</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Final report on key comparison CCQM-K55.c (L-(+)-Valine): Characterization of organic substances for chemical purity</title>
    <abstract language="eng">KEY COMPARISON&#13;
Under the auspices of the Organic Analysis Working Group (OAWG) of the Comité Consultatif pour la Quantité de Matière (CCQM) a key comparison, CCQM K55.c, was coordinated by the Bureau International des Poids et Mesures (BIPM) in 2012. Twenty National Measurement Institutes or Designated Institutes and the BIPM participated. Participants were required to assign the mass fraction of valine present as the main component in the comparison sample for CCQM-K55.c. The comparison samples were prepared from analytical grade L-valine purchased from a commercial supplier and used as provided without further treatment or purification.&#13;
&#13;
Valine was selected to be representative of the performance of a laboratory's measurement capability for the purity assignment of organic compounds of low structural complexity [molecular weight range 100300] and high polarity (pKOW &gt; –2).&#13;
&#13;
The KCRV for the valine content of the material was 992.0 mg/g with a combined standard uncertainty of 0.3 mg/g. The key comparison reference value (KCRV) was assigned by combination of KCRVs assigned from participant results for each orthogonal impurity class. The relative expanded uncertainties reported by laboratories having results consistent with the KCRV ranged from 1 mg/g to 6 mg/g when using mass balance based approaches alone, 2 mg/g to 7 mg/g using quantitative 1H NMR (qNMR) based approaches and from 1 mg/g to 2.5 mg/g when a result obtained by a mass balance method was combined with a separate qNMR result.&#13;
&#13;
The material provided several analytical challenges. In addition to the need to identify and quantify various related amino acid impurities including leucine, isoleucine, alanine and a-amino butyrate, care was required to select appropriate conditions for performing Karl Fischer titration assay for water content to avoid bias due to in situ formation of water by self-condensation under the assay conditions. It also proved to be a challenging compound for purity assignment by qNMR techniques.&#13;
&#13;
There was overall excellent agreement between participants in the identification and the quantification of the total and individual related structure impurities, water content, residual solvent and total non-volatile content of the sample. Appropriate technical justifications were developed to rationalise observed discrepancies in the limited cases where methodology differences led to inconsistent results.&#13;
&#13;
The comparison demonstrated that to perform a qNMR purity assignment the selection of appropriate parameters and an understanding of their potential influence on the assigned value is critical for reliable implementation of the method, particularly when one or more of the peaks to be quantified consist of complex multiplet signals.</abstract>
    <parentTitle language="eng">Metrologia</parentTitle>
    <identifier type="old">34064</identifier>
    <identifier type="doi">10.1088/0026-1394/51/1A/08010</identifier>
    <identifier type="issn">0026-1394</identifier>
    <identifier type="issn">1681-7575</identifier>
    <enrichment key="date_peer_review">17.07.2014</enrichment>
    <author>S. Westwood</author>
    <author>R. Josephs</author>
    <author>T. Choteau</author>
    <author>A. Daireaux</author>
    <author>R. Wielgosz</author>
    <author>S. Davies</author>
    <author>M. Moad</author>
    <author>B. Chan</author>
    <author>A. Munoz</author>
    <author>P. Conneely</author>
    <author>M. Ricci</author>
    <author>E.C.P. Do Rego</author>
    <author>B.C. Garrido</author>
    <author>F.G.M. Violante</author>
    <author>A. Windust</author>
    <author>X. Dai</author>
    <author>T. Huang</author>
    <author>W. Zhang</author>
    <author>F. Su</author>
    <author>C. Quan</author>
    <author>H. Wang</author>
    <author>M. Lo</author>
    <author>W. Wong</author>
    <author>F. Gantois</author>
    <author>B. Lalerle</author>
    <author>Ute Dorgerloh</author>
    <author>Matthias Koch</author>
    <author>Urszula-Anna Klyk-Seitz</author>
    <author>Dietmar Pfeifer</author>
    <author>Rosemarie Philipp</author>
    <author>Christian Piechotta</author>
    <author>Sebastian Recknagel</author>
    <author>Robert Rothe</author>
    <author>T. Yamazaki</author>
    <author>O. B. Zakaria</author>
    <author>E. Castro</author>
    <author>M. Balderas</author>
    <author>N. González</author>
    <author>C. Salazar</author>
    <author>L. Regalado</author>
    <author>E. Valle</author>
    <author>L. Rodríguez</author>
    <author>L.Á.. Laguna</author>
    <author>P. Ramírez</author>
    <author>M. Avila</author>
    <author>J. Ibarra</author>
    <author>L. Valle</author>
    <author>M. Arce</author>
    <author>Y. Mitani</author>
    <author>L. Konopelko</author>
    <author>A. Krylov</author>
    <author>E. Lopushanskaya</author>
    <author>T.T. Lin</author>
    <author>Q. Liu</author>
    <author>L.T. Kooi</author>
    <author>M. Fernandes-Whaley</author>
    <author>D. Prevoo-Franzsen</author>
    <author>N. Nhlapo</author>
    <author>R. Visser</author>
    <author>B. Kim</author>
    <author>H. Lee</author>
    <author>P. Kankaew</author>
    <author>P. Pookrod</author>
    <author>N. Sudsiri</author>
    <author>K. Shearman</author>
    <author>A.C. Gören</author>
    <author>G. Bilsel</author>
    <author>H. Yilmaz</author>
    <author>M. Bilsel</author>
    <author>M. Cergel</author>
    <author>F.G. Coskun</author>
    <author>E. Uysal</author>
    <author>S. Gündüz</author>
    <author>I. Ün</author>
    <author>J. Warren</author>
    <author>D.W. Bearden</author>
    <author>M. Bedner</author>
    <author>D.L. Duewer</author>
    <author>B.E. Lang</author>
    <author>K.A. Lippa</author>
    <author>M.M. Schantz</author>
    <author>J.R. Sieber</author>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>64691</id>
    <completedYear/>
    <publishedYear>2025</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>37</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1A</issue>
    <volume>62</volume>
    <type>article</type>
    <publisherName>IOP Publishing</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Key comparison CCQM-K78.b - non-polar analytes in organic solvent: methoxychlor and trifluralin in acetonitrile</title>
    <abstract language="eng">The CCQM-K78.b key comparison was coordinated by the Bureau International des Poids et Mesures (BIPM) on behalf of the CCQM Organic Analysis Working Group (OAWG) of the 'Comité Consultatif pour la Quantité de Matière' (CCQM), for National Measurement Institutes (NMIs) and Designated Institutes (DIs) providing measurement services in organic analysis under the 'Comité International des Poids et Mesures' (CIPM) Mutual Recognition Arrangement (MRA).&#13;
 This key comparison was conducted as a 'Track A' comparison within the OAWG's 10-year strategic plan. The goal of CCQM-K78.b was to underpin capabilities for the value assignment of calibration solutions containing low polarity/non-polar organic analytes in organic solvents. The selected model system consisted of a two-component pesticide solution in acetonitrile, comprising methoxychlor and trifluralin.&#13;
 Participants were tasked with assigning the mass fractions, in units of μg/g, of methoxychlor and trifluralin in acetonitrile solution. The mass fraction levels and analytical challenges of the selected analytes were representative of those encountered for calibration solutions of non-polar organic analytes. Participation in CCQM-K78.b allowed for the benchmarking of capabilities for assigning the mass fraction of non-polar organic compounds (pKow &amp;lt; -2) in solution, at mass fractions above 5 μg/g, in an organic solvent. Additionally, the comparison assessed the capabilities for the quantitative assignment of thermally labile compounds.&#13;
Participants were provided by the BIPM with ampoules containing methoxychlor and trifluralin in acetonitrile. Each participant reported the mass fraction content of each analyte in μg/g. All participants ensured the metrological traceability of their results through the use of a Primary Reference Material (PRM), which was used to prepare a primary calibrator solution for each analyte using a gravimetric procedure. The twenty participating institutes primarily used analysis procedures based on GC-MS, -IDMS, -MS/MS, -ECD, and -FID, with some participants also using LC-UV for the value assignment.&#13;
 The analysis of methoxychlor and trifluralin in acetonitrile solution presented several challenges, including the thermal stability of the analytes under selected analytical techniques, control of solvent volatility, and considerable variation in some results using MS-based quantification methods. The mass fraction assignments for methoxychlor and trifluralin, consistent with the key comparison reference values (KCRVs), were achieved with associated relative standard uncertainties of (0.38 - 2.9) % for methoxychlor and (0.35 - 2.5) % for trifluralin.&#13;
 To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.&#13;
 The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</abstract>
    <parentTitle language="eng">Metrologia</parentTitle>
    <identifier type="issn">0026-1394</identifier>
    <identifier type="doi">10.1088/0026-1394/62/1A/08010</identifier>
    <enrichment key="opus_doi_flag">true</enrichment>
    <enrichment key="local_crossrefDocumentType">journal-article</enrichment>
    <enrichment key="local_crossrefLicence">https://iopscience.iop.org/page/copyright</enrichment>
    <enrichment key="local_import_origin">crossref</enrichment>
    <enrichment key="local_doiImportPopulated">PersonAuthorFirstName_1,PersonAuthorLastName_1,PersonAuthorIdentifierOrcid_1,PersonAuthorFirstName_2,PersonAuthorLastName_2,PersonAuthorIdentifierOrcid_2,PersonAuthorFirstName_3,PersonAuthorLastName_3,PersonAuthorFirstName_4,PersonAuthorLastName_4,PersonAuthorIdentifierOrcid_4,PersonAuthorFirstName_5,PersonAuthorLastName_5,PersonAuthorFirstName_6,PersonAuthorLastName_6,PersonAuthorFirstName_7,PersonAuthorLastName_7,PersonAuthorFirstName_8,PersonAuthorLastName_8,PersonAuthorIdentifierOrcid_8,PersonAuthorFirstName_9,PersonAuthorLastName_9,PersonAuthorFirstName_10,PersonAuthorLastName_10,PersonAuthorFirstName_11,PersonAuthorLastName_11,PersonAuthorFirstName_12,PersonAuthorLastName_12,PersonAuthorFirstName_13,PersonAuthorLastName_13,PersonAuthorFirstName_14,PersonAuthorLastName_14,PersonAuthorIdentifierOrcid_14,PersonAuthorFirstName_15,PersonAuthorLastName_15,PersonAuthorIdentifierOrcid_15,PersonAuthorFirstName_16,PersonAuthorLastName_16,PersonAuthorFirstName_17,PersonAuthorLastName_17,PersonAuthorFirstName_18,PersonAuthorLastName_18,PersonAuthorFirstName_19,PersonAuthorLastName_19,PersonAuthorFirstName_20,PersonAuthorLastName_20,PersonAuthorFirstName_21,PersonAuthorLastName_21,PersonAuthorFirstName_22,PersonAuthorLastName_22,PersonAuthorFirstName_23,PersonAuthorLastName_23,PersonAuthorFirstName_24,PersonAuthorLastName_24,PersonAuthorFirstName_25,PersonAuthorLastName_25,PersonAuthorFirstName_26,PersonAuthorLastName_26,PersonAuthorFirstName_27,PersonAuthorLastName_27,PersonAuthorFirstName_28,PersonAuthorLastName_28,PersonAuthorFirstName_29,PersonAuthorLastName_29,PersonAuthorFirstName_30,PersonAuthorLastName_30,PersonAuthorFirstName_31,PersonAuthorLastName_31,PersonAuthorFirstName_32,PersonAuthorLastName_32,PersonAuthorFirstName_33,PersonAuthorLastName_33,PersonAuthorFirstName_34,PersonAuthorLastName_34,PersonAuthorFirstName_35,PersonAuthorLastName_35,PersonAuthorFirstName_36,PersonAuthorLastName_36,PersonAuthorFirstName_37,PersonAuthorLastName_37,PersonAuthorFirstName_38,PersonAuthorLastName_38,PersonAuthorFirstName_39,PersonAuthorLastName_39,PersonAuthorFirstName_40,PersonAuthorLastName_40,PersonAuthorFirstName_41,PersonAuthorLastName_41,PersonAuthorFirstName_42,PersonAuthorLastName_42,PersonAuthorFirstName_43,PersonAuthorLastName_43,PersonAuthorFirstName_44,PersonAuthorLastName_44,PersonAuthorFirstName_45,PersonAuthorLastName_45,PersonAuthorFirstName_46,PersonAuthorLastName_46,PersonAuthorFirstName_47,PersonAuthorLastName_47,PersonAuthorFirstName_48,PersonAuthorLastName_48,PersonAuthorFirstName_49,PersonAuthorLastName_49,PersonAuthorFirstName_50,PersonAuthorLastName_50,PublisherName,TitleMain_1,TitleAbstract_1,TitleParent_1,ArticleNumber,Issue,Volume,PublishedYear,IdentifierIssn,Enrichmentlocal_crossrefLicence</enrichment>
    <enrichment key="opus.source">doi-import</enrichment>
    <author>S. Westwood</author>
    <author>R. D. Josephs</author>
    <author>T. Choteau</author>
    <author>G. Martos</author>
    <author>R. Wielgosz</author>
    <author>Y. A. Sarzuri</author>
    <author>E. Mendoza</author>
    <author>E. C. P. do Rego</author>
    <author>F. G. M. Violante</author>
    <author>W. da Silva Souza</author>
    <author>L. J. de Carvalho</author>
    <author>J. L. N. Fernandes</author>
    <author>J. Bates</author>
    <author>I. Rajotte</author>
    <author>J. E. Melanson</author>
    <author>H. Li</author>
    <author>Z. Guo</author>
    <author>F. Su</author>
    <author>S. Wang</author>
    <author>T. Huang</author>
    <author>B. Lalerle</author>
    <author>F. Gantois</author>
    <author>Christian Piechotta</author>
    <author>Rosemarie Philipp</author>
    <author>Katja Kaminski</author>
    <author>Urzsula-Anna Klyk-Seitz</author>
    <author>P. Giannikopoulou</author>
    <author>E. Skotidaki</author>
    <author>E. Kakoulides</author>
    <author>C. Pui-Kwan</author>
    <author>M. Kuroe</author>
    <author>N. Itoh</author>
    <author>M. A. A. Calderón</author>
    <author>L. R. Contreras</author>
    <author>M. A. Osuna</author>
    <author>M. Alrashed</author>
    <author>L. Ting</author>
    <author>G. E. Mei</author>
    <author>W. Juan</author>
    <author>C. P. Sze</author>
    <author>T. T. Lin</author>
    <author>L. Quinn</author>
    <author>C. Swiegelaar</author>
    <author>M. Fernandes-Whaley</author>
    <author>S. Ahn</author>
    <author>T. Chaiphet</author>
    <author>N. Sudsiri</author>
    <author>W. Bellazreg</author>
    <author>M. Bilsel</author>
    <author>G. Colombo</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Methoxychlor</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Trifluralin</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>CCQM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Key comparison</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="institutes" number="">1 Analytische Chemie; Referenzmaterialien</collection>
    <collection role="institutes" number="">1.8 Umweltanalytik</collection>
    <collection role="themenfelder" number="">Chemie und Prozesstechnik</collection>
    <collection role="themenfelder" number="">Chemische Charakterisierung und Spurenanalytik</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>54188</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>08015</pageFirst>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>1A</issue>
    <volume>58</volume>
    <type>article</type>
    <publisherName>IOP Publishing</publisherName>
    <publisherPlace/>
    <creatingCorporation>Bureau International des Poids et Mesures (BIPM)</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Mass fraction assignment of Bisphenol-A high purity material</title>
    <abstract language="eng">The CCQM-K148.a comparison was coordinated by the BIPM on behalf of the CCQM Organic Analysis Working Group for NMIs and DIs which provide measurement services in organic analysis under the CIPM MRA. It was undertaken as a "Track A" comparison within the OAWG strategic plan. CCQM-K148.a demonstrates capabilities for assigning the mass fraction content of a solid organic compound having moderate molecular complexity, where the compound has a molar mass in the range (75 - 500) g/mol and is non-polar (pKow &lt; −2), when present as the primary organic component in a neat organic solid and where the mass fraction content of the primary component in the material is in excess of 950 mg/g.&#13;
&#13;
Participants were required to report the mass fraction of Bisphenol A present in one supplied unit of the comparison material. Participants using a mass balance method for the assignment were also required to report their assignments of the impurity components present in the material. Methods used by the seventeen participating NMIs or DIs were predominantly based on either stand-alone mass balance (summation of impurities) or qNMR approaches, or the combination of data obtained using both methods. The results obtained using thermal methods based on freezing-point depression methods were also reported by a limited number of participants. There was excellent agreement between assignments obtained using all three approaches to assign the BPA content.&#13;
&#13;
The assignment of the values for the mass fraction content of BPA consistent with the KCRV was achieved by most of the comparison participants with an associated relative standard uncertainty in the assigned value in the range (0.1 - 0.5)%.</abstract>
    <parentTitle language="eng">Metrologia</parentTitle>
    <identifier type="doi">10.1088/0026-1394/58/1A/08015</identifier>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">05.01.2022</enrichment>
    <author>S. Westwood</author>
    <author>G. Martos</author>
    <author>R. Josephs</author>
    <author>T. Choteau</author>
    <author>R. Wielgosz</author>
    <author>S. Davies</author>
    <author>M. Moawad</author>
    <author>G. Tarrant</author>
    <author>B. Chan</author>
    <author>M. Alamgir</author>
    <author>E. de Rego</author>
    <author>W. Wollinger</author>
    <author>B. Garrido</author>
    <author>J. Fernandes</author>
    <author>R. de Sena</author>
    <author>R. Oliveira</author>
    <author>J. Melanson</author>
    <author>J. Bates</author>
    <author>P. Mai Le</author>
    <author>J. Meija</author>
    <author>C. Quan</author>
    <author>T. Huang</author>
    <author>W. Zhang</author>
    <author>R. Ma</author>
    <author>S. Zhang</author>
    <author>Y. Hao</author>
    <author>Y. He</author>
    <author>S. Song</author>
    <author>H. Wang</author>
    <author>F. Su</author>
    <author>T. Zhang</author>
    <author>H. Li</author>
    <author>W. Lam</author>
    <author>W. Wong</author>
    <author>W. Fung</author>
    <author>Rosemarie Philipp</author>
    <author>Ute Dorgerloh</author>
    <author>Klas Meyer</author>
    <author>Christian Piechotta</author>
    <author>Juliane Riedel</author>
    <author>Tanja Westphalen</author>
    <author>P. Giannikopoulou</author>
    <author>Ch. Alexopoulos</author>
    <author>E. Kakoulides</author>
    <author>Y. Kitamaki</author>
    <author>T. Yamazaki</author>
    <author>Y. Shimizu</author>
    <author>M. Kuroe</author>
    <author>M. Numata</author>
    <author>A. Pérez-Castorena</author>
    <author>M. Balderas-Escamilla</author>
    <author>J. Garcia-Escalante</author>
    <author>A. Krylov</author>
    <author>A. Mikheeva</author>
    <author>M. Beliakov</author>
    <author>M. Palagina</author>
    <author>I. Tkachenko</author>
    <author>S. Spirin</author>
    <author>V. Smirnov</author>
    <author>T. Tang Lin</author>
    <author>C. Pui Sze</author>
    <author>W. Juan</author>
    <author>W. Lingkai</author>
    <author>L. Ting</author>
    <author>L. Quinde</author>
    <author>C. Yizhao</author>
    <author>S. Lay Peng</author>
    <author>M. Fernandes-Whaley</author>
    <author>D. Prevoo-Franzsen</author>
    <author>L. Quinn</author>
    <author>N. Nhlapo</author>
    <author>D. Mkhize</author>
    <author>D. Marajh</author>
    <author>S. Chamane</author>
    <author>S. Ahn</author>
    <author>K. Choi</author>
    <author>S. Lee</author>
    <author>J. Han</author>
    <author>S. Baek</author>
    <author>B. Kim</author>
    <author>S. Marbumrung</author>
    <author>P. Jongmesuk</author>
    <author>K. Shearman</author>
    <author>C. Boonyakong</author>
    <author>M. Bilsel</author>
    <author>S. Gündüz</author>
    <author>I. Ün</author>
    <author>H. Yilmaz</author>
    <author>G. Bilsel</author>
    <author>T. Gökçen</author>
    <author>C. Clarkson</author>
    <author>J. Warren</author>
    <author>E. Achtar</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Bisphenol-A</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Purity assessment</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Interlaboratory key comparison</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Metrology</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="institutes" number="">1 Analytische Chemie; Referenzmaterialien</collection>
    <collection role="institutes" number="">1.4 Non-Target-Analytik</collection>
    <collection role="institutes" number="">1.7 Organische Spuren- und Lebensmittelanalytik</collection>
    <collection role="institutes" number="">1.8 Umweltanalytik</collection>
    <collection role="themenfelder" number="">Chemie und Prozesstechnik</collection>
    <collection role="themenfelder" number="">Chemische Charakterisierung und Spurenanalytik</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>44999</id>
    <completedYear/>
    <publishedYear>2018</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>08013, 1</pageFirst>
    <pageLast>38</pageLast>
    <pageNumber/>
    <edition/>
    <issue>Technical Supplement, 2018</issue>
    <volume>55</volume>
    <type>article</type>
    <publisherName>Institute of Physics Publishing (IOP) ; Bureau International des Poids et Mesures</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Mass fraction assignment of folic acid in a high purity material - CCQM-K55.d (Folic acid) Final Report</title>
    <abstract language="eng">The comparison required the assignment of the mass fraction of folic acid present as the main component in the comparison sample. Performance in the comparison is representative of a laboratory's measurement capability for the purity assignment of organic compounds of medium structural complexity [molecular weight range 300–500] and high polarity (pKOW &lt; −2).&#13;
Methods used by the eighteen participating NMIs or DIs were based on a mass balance (summation of impurities) or qNMR approach, or the combination of data obtained using both methods. The qNMR results tended to give slightly lower values for the content of folic acid, albeit with larger associated uncertainties, compared with the results obtained by mass balance procedures. Possible reasons for this divergence are discussed in the report, without reaching a definitive conclusion as to their origin.&#13;
The comparison demonstrates that for a structurally complex polar organic compound containing a high water content and presenting a number of additional analytical challenges, the assignment of the mass fraction content property value of the main component can reasonably be achieved with an associated relative standard uncertainty in the assigned value of 0.5%</abstract>
    <parentTitle language="eng">Metrologia</parentTitle>
    <identifier type="doi">10.1088/0026-1394/55/1A/08013</identifier>
    <identifier type="url">https://www.bipm.org/utils/common/pdf/final_reports/QM/K55/CCQM-K55.d.pdf</identifier>
    <enrichment key="date_peer_review">06.05.2019</enrichment>
    <author>S. Westwood</author>
    <author>R. Josephs</author>
    <author>T. Choteau</author>
    <author>A. Daireaux</author>
    <author>N. Stoppacher</author>
    <author>R. Wielgosz</author>
    <author>S. Davies</author>
    <author>E. do Rego</author>
    <author>W. Wollinger</author>
    <author>B. Garrido</author>
    <author>J. Fernandes</author>
    <author>J. Lima</author>
    <author>R. Oliveira</author>
    <author>R. de Sena</author>
    <author>A. Windust</author>
    <author>T. Huang</author>
    <author>X. Dai</author>
    <author>C. Quan</author>
    <author>H. He</author>
    <author>W. Zhang</author>
    <author>C. Wei</author>
    <author>N. Li</author>
    <author>D. Gao</author>
    <author>Z. Liu</author>
    <author>M. Lo</author>
    <author>W. Wong</author>
    <author>Dietmar Pfeifer</author>
    <author>Matthias Koch</author>
    <author>Ute Dorgerloh</author>
    <author>Robert Rothe</author>
    <author>Rosemarie Philipp</author>
    <author>N. Hanari</author>
    <author>M. Rezali</author>
    <author>C. Arzate</author>
    <author>M. Berenice</author>
    <author>V. Caballero</author>
    <author>M. Osuna</author>
    <author>A. Krylov</author>
    <author>S. Kharitonov</author>
    <author>E. Lopushanskaya</author>
    <author>Q. Liu</author>
    <author>T. Lin</author>
    <author>M. Fernandes-Whaley</author>
    <author>L. Quinn</author>
    <author>N. Nhlapo</author>
    <author>D. Prevoo-Franzsen</author>
    <author>M. Archer</author>
    <author>B. Kim</author>
    <author>S. Baek</author>
    <author>S. Lee</author>
    <author>J. Lee</author>
    <author>S. Marbumrung</author>
    <author>P. Kankaew</author>
    <author>K. Chaorenpornpukdee</author>
    <author>T. Chaipet</author>
    <author>K. Shearman</author>
    <author>A. Gören</author>
    <author>S. Gündüz</author>
    <author>H. Yilmaz</author>
    <author>I. Un</author>
    <author>G. Bilsel</author>
    <author>C. Clarkson</author>
    <author>M. Bedner</author>
    <author>J. Camara</author>
    <author>B. Lang</author>
    <author>K. Lippa</author>
    <author>M. Nelson</author>
    <author>B. Toman</author>
    <author>L. Yu</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>CCQM key comparison</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Purity assessment</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Folic acid</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
</export-example>
