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Methylmercury in tuna: demonstrating measurement capabilities and evaluating comparability of results worldwide from the CCQM P-39 comparison
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Six metrology institutes (NMIs) representing at the Comite 'International des Poids et Mesures (CIPM) 4 Member States of the Metre Convention and 2 international organisations, and 8 "expert'' laboratories selected outside CIPM have compared their capabilities to quantitatively measure methylmercury (MeHg) in a prepared tuna material containing approximately 4.3 mg kg(-1) Hg. This comparison was the object of the CIPM - Comite Consultatif pour la Quantite de Matiere (CCQM) Pilot Study 39, organised by the Institute for Reference Materials and Measurements (IRMM), from the European Commission - Joint Research Centre. Beside the test material itself, a bottle of the BCR-464 tuna Certified Reference Material (CRM) and an ampoule of IRMM-670, a 202 Hg isotope enriched MeHg candidate isotopic CRM, were distributed to all participants, who were free to apply the measurement strategy of their choice. Four, including 1 NMI, relied on external calibration or the method of standard additions, whereas the other 10 implemented an isotope dilution mass spectrometry (IDMS) approach and chose to use the IRMM-670 for their measurements. Alkaline digestion at room temperature ( with manual shaking) or high temperature ( under sonication, oven or hot plate conditions) was employed by most participants, with hydrochloric acid leaching the second most popular choice. Alkylation ( 4 phenylations, 4 ethylations and 3 propylations) in the aqueous phase was preferred by a large majority over butylation by the Grignard reaction. All participants were requested to estimate the uncertainty associated with their results and 9 out of 14 stated relative combined uncertainties below 6% (k = 2). Despite this apparent consensus, the perception of which factor caused the largest contribution to this estimation differed among participants because of the differences in the analytical methodologies deployed but also because of wide differences of the concepts of uncertainty estimation. The mixture mode' (MM) median, calculated also from the measurement uncertainties stated by the participants, was 1.967 +/- 0.204 x 10(-5) mol kg(-1) (95% confidence). Twelve of the results were re-grouped within a range of less than 0.3 x 10(-5) mol kg(-1) (MM median = 1.967 +/- 0.162 x 10(-5) mol kg(-1), 95% confidence): they nearly all (1 exception) overlapped with each other within k = 2 stated uncertainties. For the other 2 results the uncertainty seemed to have been particularly underestimated as they lay, respectively, at more than 20% above and less than - 40% below the overall average. The relative standard deviation of the results of 9 laboratories out of the 10 that applied IDMS was about 2.6%. It can be assumed from the degree of equivalence shown by 12 out of 14 study participants that, at present, laboratories worldwide are potentially able to supply accurate results for MeHg in fish-type matrices ( containing about 2 x 10(-5) mol kg(-1)) within +/- 10% uncertainty. This encouraging outcome permitted scheduling of a follow-up CCQM-K43 key comparison for a lower MeHg content level in salmon tissues.
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<div class="JournalArticle Publication short-list"> <div class="authors"> <span class="author-name" > Quetel, CR </span> <span class="author-type"> </span> ; <span class="author-name" > Snell, JP </span> <span class="author-type"> </span> ; <span class="author-name" > Aregbe, Y </span> <span class="author-type"> </span> ; <span class="author-name" mtid="10015451"> <a href="/gui2/?type=authors&mode=browse&sel=10015451" target="_blank">Abranko, L</a> </span> <span class="author-type"> </span> ; <span class="author-name" mtid="10033599"> <a href="/gui2/?type=authors&mode=browse&sel=10033599" target="_blank">Jokai, Z</a> </span> <span class="author-type"> </span> ; <span class="author-name" > Brunori, C </span> <span class="author-type"> </span> ; <span class="author-name" > Morabito, R </span> <span class="author-type"> </span> ; <span class="author-name" > Hagan, W </span> <span class="author-type"> </span> ; <span class="author-name" > Azemard, S </span> <span class="author-type"> </span> ; <span class="author-name" > Wyse, E </span> <span class="author-type"> </span> et al. </div ><div class="title"><a href="/gui2/?mode=browse¶ms=publication;1390069" mtid="1390069" target="_blank">Methylmercury in tuna: demonstrating measurement capabilities and evaluating comparability of results worldwide from the CCQM P-39 comparison</a></div> <div class="pub-info"> <span class="journal-title">JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY</span> <span class="journal-volume">20</span> : <span class="journal-issue">10</span> <span class="page"> pp. 1058-1066. , 9 p. </span> <span class="year">(2005)</span> </div> <div class="pub-end"><div class="identifier-list"> <span class="identifiers"> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="10.1039/b505368d" target="_blank" href="https://doi.org/10.1039/b505368d"> DOI </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="000232103300008" target="_blank" href="https://www.webofscience.com/wos/woscc/full-record/000232103300008"> WoS </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:black" title="27144446714" target="_blank" href="http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-27144446714"> Scopus </a> </span> </span> </div> <div class="short-pub-prop-list"> <span class="short-pub-mtid"> Közlemény:1390069 </span> <span class="status-holder"><span class="status-data status-ADMIN_APPROVED"> Admin láttamozott </span></span> <span class="pub-core">Forrás Idéző </span> <span class="pub-type">Folyóiratcikk (Szakcikk ) </span> <!-- && !record.category.scientific --> <span class="pub-category">Tudományos</span> <div class="publication-citation" style="margin-left: 0.5cm;"> <span title="Nyilvános idézőközlemények összesen, említések nélkül" class="citingPub-count">Nyilvános idéző összesen: 15</span> | Független: 8 | Függő: 7 | Nem jelölt: 0 | WoS jelölt: 13 | Scopus jelölt: 11 | WoS/Scopus jelölt: 15 | DOI jelölt: 13 </div> </div> </div> </div><div class="JournalArticle Publication long-list"> <div class="authors"> <img title="Forrásközlemény" style="float: left" src="/frontend/resources/grid/publication-core-icon.png"> <img title="Idézőközlemény" style="float: left" src="/frontend/resources/grid/publication-citation-icon.png"> <div class="autype autype0"> <span class="author-name" >Quetel CR </span> ; <span class="author-name" >Snell JP </span> ; <span class="author-name" >Aregbe Y </span> ; <span class="author-name" mtid="10015451"><a href="/gui2/?type=authors&mode=browse&sel=10015451" target="_blank">Abranko L (<span class="authorship-author-name">Abrankó László</span> <span class="authorAux-mtmt"> Élelmiszertudomány</span>) </a> </span> <span class="author-affil"><span title="Budapesti Corvinus Egyetem">BCE</span>/<span title="Élelmiszertudományi Kar">ÉTK</span>/Alkalmazott Kémia Tanszék</span> ; <span class="author-name" mtid="10033599"><a href="/gui2/?type=authors&mode=browse&sel=10033599" target="_blank">Jokai Z (<span class="authorship-author-name">Jókainé Szatura Zsuzsa</span> <span class="authorAux-mtmt"> Higanyspeciáció, molekulaspektroszkópia</span>) </a> </span> <span class="author-affil"><span title="Budapesti Corvinus Egyetem">BCE</span>/<span title="Élelmiszertudományi Kar">ÉTK</span>/Alkalmazott Kémia Tanszék</span> ; <span class="author-name" >Brunori C </span> ; <span class="author-name" >Morabito R </span> ; <span class="author-name" >Hagan W </span> ; <span class="author-name" >Azemard S </span> ; <span class="author-name" >Wyse E </span> ; <span class="author-name" >Fajon V </span> ; <span class="author-name" >Horvat M </span> ; <span class="author-name" >Logar M </span> ; <span class="author-name" >Donard OFX </span> ; <span class="author-name" >Krupp E </span> ; <span class="author-name" >Entwisle J </span> ; <span class="author-name" >Hearn R </span> ; <span class="author-name" >Schantz M </span> ; <span class="author-name" >Inagaki K </span> ; <span class="author-name" >Takatsu A </span> ; <span class="author-name" >Grinberg P </span> ; <span class="author-name" >Willlie S </span> ; <span class="author-name" >Dimock B </span> ; <span class="author-name" >Hintelmann H </span> ; <span class="author-name" >Zhu J </span> ; <span class="author-name" >Gonzalez EB </span> ; <span class="author-name" >Centineo G </span> ; <span class="author-name" >Alonso JEG </span> ; <span class="author-name" >Sanz-Medel A </span> ; <span class="author-name" >Bjorn E </span> </div> </div> <div class="title"><a href="/gui2/?mode=browse¶ms=publication;1390069" target="_blank">Methylmercury in tuna: demonstrating measurement capabilities and evaluating comparability of results worldwide from the CCQM P-39 comparison</a></div> <div> <span class="journal-title">JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY</span> <span class="journal-issn">(<a target="_blank" href="https://portal.issn.org/resource/ISSN/0267-9477">0267-9477</a> <a target="_blank" href="https://portal.issn.org/resource/ISSN/1364-5544">1364-5544</a>)</span>: <span class="journal-volume">20</span> <span class="journal-issue">10</span> <span class="page"> pp 1058-1066 </span> <span class="year">(2005)</span> </div> <div class="pub-footer"> <span class="language" xmlns="http://www.w3.org/1999/html">Nyelv: Angol | </span> <span class="identifiers"> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="10.1039/b505368d" target="_blank" href="https://doi.org/10.1039/b505368d"> DOI </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="000232103300008" target="_blank" href="https://www.webofscience.com/wos/woscc/full-record/000232103300008"> WoS </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:black" title="27144446714" target="_blank" href="http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-27144446714"> Scopus </a> </span> </span> <div class="publication-citation" style="margin-left: 0.5cm;"> <span title="Nyilvános idézőközlemények összesen, említések nélkül" class="citingPub-count">Nyilvános idéző összesen: 15</span> | Független: 8 | Függő: 7 | Nem jelölt: 0 | WoS jelölt: 13 | Scopus jelölt: 11 | WoS/Scopus jelölt: 15 | DOI jelölt: 13 </div> <div class="publication-citation"> <a target="_blank" href="/api/publication?cond=citations.related;eq;1390069&sort=publishedYear,desc&sort=title"> Idézett közlemények száma: 2 </a> </div> <div class="mtid"><span class="long-pub-mtid">Közlemény: 1390069</span> | <span class="status-data status-ADMIN_APPROVED"> Admin láttamozott </span> <span class="oldId">Régi azonosító: 1390069</span> | Forrás Idéző | <span class="type-subtype">Folyóiratcikk ( Szakcikk ) </span> | <span class="pub-category">Tudományos</span> | <span class="publication-sourceOfData">WOS</span> </div> <div class="lastModified">Utolsó módosítás: 2023.09.19. 09:33 MTMT API (MTMT API user, admin) </div> </div></div>