jrc79301_report%20eu-rl%20pahs%20pt%20on%20chocolate%202012_ver11

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Results reported by OCLs for the fat content and the sum of the four marker PAHs (SUM4PAH) in the chocolate test material. A) Results are expressed on product basis (µg/kg chocolate): Assigned value is: 5.64 µg/kg. B) Results are expressed on fat basis (µg/kg fat): Assigned value is: 9.57 µg/kg. A) B) n.r.: not reported k.: coverage factor n.r: not reported k.: coverage factor 98
European Commission EUR 25806 – Joint Research Centre – Institute for Reference Materials and Measurements Title: Report on the 10th inter-laboratory comparison organised by the European Union Reference Laboratory for Polycyclic Aromatic Hydrocarbons - Four marker PAHs in chocolate and cocoa butter Author(s): Radoslav Lizak, Zuzana Zelinkova, Philippe Verlinde and Thomas Wenzl Luxembourg: Publications Office of the European Union 2013 – 98 pp. – 21.0 x 29.7 cm EUR – Scientific and Technical Research series – ISSN 1831-9424 (online) ISBN 978-92-79-28532-5 doi: 10.2787/74998 Abstract This report presents the results of the tenth inter-laboratory comparison (ILC) organised by the European Union Reference Laboratory for Polycyclic Aromatic Hydrocarbons (EU-RL PAHs) on the determination of the four EU marker PAHs, benz[a]anthracene (BAA), benzo[a]pyrene (BAP), benzo[b]fluoranthene (BBF) and chrysene (CHR), in cocoa products, particularly in plain chocolate and cocoa butter. It was conducted under ISO Standard 17043 accreditation. In agreement with National Reference Laboratories, the test material used in this exercise were commercial products. Participants also received a solution of PAHs in solvent of their choice (either toluene or acetonitrile) with disclosed content for the verification of their instrument calibration. Consensus values were used to benchmark the results reported by participants, as the experience of the analytical community with this analysis scope was considered not sufficient to provide reference values. Both officially nominated National Reference Laboratories (NRLs) and official food control laboratories (OCLs) of the EU Member States were admitted as participants. The participants were free to choose the method of analysis. The performance of the participating laboratories in the determination of the target PAHs in cocoa butter and plain chocolate was expressed by z-scores. Satisfactory performance with regard to z-scores was assigned to about 81 % of the reported results.
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Report on the 10 th inter-laborator
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Report on the 10 th inter-laborator
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1 Summary This report presents the
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3 Scope As specified in Regulation
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Table 3: List of participating Offi
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The stability of the test material
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8 Design of the proficiency test Th
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Figure 1 and Figure 2 provide overv
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Table 8: Compilation of z-scores ca
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Table 9: Compilation of z-scores ca
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Table 10: Compilation of z-scores c
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9.4 6Evaluation of compliance with
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13 References 1 EU, COMMISSION REGU
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ANNEX 1: Announcement of the PT on
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Confirmation of participation 36
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ANNEX 4: Documents sent to particip
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GUIDANCE FOR REPORTING 43
Page 48 and 49: ANNEX 5: Technical specifications o
Page 50: ANNEX 6: Homogeneity of the test ma
Page 54: ANNEX 7: Questionnaire and method p
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Page 68 and 69: Method performance data reported by
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Page 72 and 73: Results reported by NRLs for the co
Page 74 and 75: µg/kg Distribution of individual r
Page 76 and 77: Results reported by OCLs for the co
Page 84 and 85: Results reported by OCLs for the su
Page 100: As the Commission’s in-house scie
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jrc79301_report%20eu-rl%20pahs%20pt%20on%20chocolate%202012_ver11

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