Title: IMEP-42: Determination of PFASs in fish
Publisher: Publications Office of the European Union
Publication Year: 2015
JRC N°: JRC98549
ISBN: 978-92-79-53884-1
ISSN: 1831-9424
Other Identifiers: EUR 27579
OP LA-NA-27579-EN-N
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC98549
DOI: 10.2787/063168
Type: EUR - Scientific and Technical Research Reports
Abstract: The Institute for Reference Materials and Measurements of the Joint Research Centre, a Directorate General of the European Commission (EC-JRC-IRMM) operates the International Measurement Evaluation Programme (IMEP). It organises interlaboratory comparisons (ILC's) in support to European Union (EU) policies. This report presents the results of a proficiency test (PT), IMEP-42, on the determination of perfluoroalkyl substances (PFASs) in fish tissue. The exercise was organised in support to the Commission Recommendation 2010/161/EU on the monitoring of perfluoroalkylated substances in food and the Water Framework Directive 2000/60/EC. Seventeen participants from thirteen countries registered to the exercise and all of them reported results. The test item was fish tissue (pike-perch) containing perfluoroalkyl carboxylates as perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnDA), perfluorododecanoic acid (PFDoDA), perfluorotridecanoic acid (PFTrDA) or perfluorotetradecanoic acid (PFTeDA); perfluoroalkyl sulfonates as perfluorohexanesulfonate (PFHxS), linear perfluorooctane sulfonate (L-PFOS) or branched perfluorooctane sulfonate (br-PFOS); and, perfluoroalkyl sulphonamides as perfluorooctane sulphonamide (FOSA). The test item was a candidate certified reference material (CRM) produced by IRMM under ISO Guide 34 accreditation and in line with ISO Guide 35. Laboratories with demonstrated experience in the field provided results to establish the assigned values (Xref). The standard uncertainties associated to the assigned values (uref) were calculated according to the ISO Guide 35 by combining the uncertainty of the characterisation (uchar) with a contribution for homogeneity (ubb) and for stability (ust). Laboratory results were rated with z- and zeta (ζ-) scores in accordance with ISO 13528. The standard deviation for the proficiency assessment, σ ̂, for all elements was set at 25 % of the respective assigned value. The overall performance in this PT was good even though analyte dependent. High rates (78% - 100%) of satisfactory performances expressed as z-scores ≤ 2 were obtained for L-PFOS, PFDA, PFUnDA, PFDoDA, tot-PFOS and FOSA while the lowest rates of satisfactory performances (50%) were obtained for br-PFOS and PFTrDA. Many "less than X" values were reported for the three PFASs that could not be scored due to the high uncertainty on the assigned value (PFNA, PFTeDA and PFHxS). The results in this PT showed that the sensitivities of the methods used by the participants were fit for the purpose of measuring the legal limits set in legislation.
JRC Directorate:Health, Consumers and Reference Materials

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