A proficiency test was conducted with 31 European National Reference Laboratories (NRLs) for mycotoxins and one Laboratory from a candidate country. Test materials were a mixed aflatoxin (Af) solution in acetonitrile and two candidate Certified Reference Materials (CRM) - one "aflatoxin positive" and one "blank" material - that have not yet been released. Laboratories determined the aflatoxin content by reverse-phase high-performance liquid-chromatography (RP-HPLC) with either fluorescence or mass-selective detection against their own standard solutions as reference.
Applying the modified Horwitz equation according to Thompson as a basis for the target standard deviation (22% in the case of this proficiency test), 26 out of 32 laboratories achieved z scores of less than 2 and 17 laboratories reported values within the uncertainty range for both aflatoxin B1 and total aflatoxins in the candidate CRM after correction for recovery in both cases.
STROKA Joerg;
BREIDBACH Andreas;
DONCHEVA TSANEVA Ivanka;
AMBROSIO Massimo;
2008-03-03
OPOCE
JRC43543
978-92-79-08394-5,
1018-5593,
EUR 23261 EN,
OP LA-NA-23261-EN-C,
https://publications.jrc.ec.europa.eu/repository/handle/JRC43543,
10.2787/28654,
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