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Determination of As, Asi, Cd, Pb, Cu and Zn in chocolate (PT-2017-NRL-TE-FASFC). Final report on the 2017 Proficiency Test organised by the National Reference Laboratory for Trace Elements in Food and Feed., Cheyns, Karlien, and Waegeneers Nadia , 09/2017, Brussel, Belgi\'eb, p.NA, (2017)\par \par }