Report of the third interlaboratory comparison, Total Cd, Pb and Hg and extractable Cd and Pb in feed
The Institute for Reference Materials and Measurements (IRMM) of the Joint Research Centre, a Directorate-General of the European Commission, operates the Community Reference Laboratory for Heavy Metals in Feed and Food (CRL-HM). One of its core tasks is to organise interlaboratory comparisons (ILCs) among appointed National Reference Laboratories (NRLs). This report presents the results of the third ILC of the CRL-HM which focused on the determination of total Cd, Pb and Hg and extractable Cd and Pb in feed according to Directive 2002/32/EC of the European Parliament and of the Council on undesirable substances in animal feed. The test material used in this exercise was a commercial compound feed for fish provided by the Centro di Referenza Nazionale per la Sorveglianza e il Controllo degli Alimenti per Animali, Istituto Zooprofilattico del Piemonte. The material, naturally contaminated, was processed, bottled, labelled and dispatched by the Reference Materials Unit of the IRMM. The samples were dispatched on the second half of October 2007. Each participant received one bottle containing approximately 20 g of test material. Thirty-one participants from 25 countries registered to the exercise of which 31 submitted results for total Cd and total Pb, 28 for total Hg, 26 for extractable Cd and 24 for extractable Pb. The assigned values (Xref) were provided by IRMM using isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS). The analytical uncertainty of Xrcf, uchar, was calculated according to the ISO Guide to the Expression of Uncertainty in Measurement (GUM). Homogeneity and stability studies were subcontracted to Bundesanstalt für Materialforschung und -Prüfung (BAM). The uncertainties of the respective assigned values, uref, were calculated combining the analytical uncertainty, uChar, with a contribution for the between-bottle homogeneity, Ubb, and for the short term stability of the test material, usts.
Bibliographic Reference: EUR 23236 EN (2007), 45 pp. Free of charge
Availability: Katalogue Number: LA-NA-23236-EN-C The paper version can be ordered online and the PDF version downloaded at: http://bookshop.europa.eu
ISBN: ISBN 978-92-79-08275-7
Record Number: 200819725 / Last updated on: 2008-05-05
Original language: en
Available languages: en