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In order to determine the state of the art of dioxin analyses in cow's milk, the BCR organised an intercomparison in native and fortified milk powders. The preparation of the milk powder batches is described. Laboratories used their own in-house methods and standards. An outline is given of how the results obtained were interpreted in discussions with the participants. A major problem in the quantification is the lack of certified standard solutions of all seventeen 2, 3, 7, 8 congeners, which was shown during the analysis of the BCR standard solution. Recovery of the fortified dioxins from the milk powders was in general 80 - 90 % of the added values. A further problem was the analysis of hepta and octa chlorinated congeners; for the calculation of international toxicological equivalent quantities (I-TEQ), larger variations in these did not significantly affect the total I-TEQ in milk powder. Most of the participants were able to deliver satisfactory results for judging the acceptability of the milk for human consumption.

Additional information

Authors: SCHIMMEL H, European Commission, Bruxelles (BE);GRIEPINK B, European Commission, Bruxelles (BE);MAIER E A, European Commission, Bruxelles (BE);KRAMER G N, JRC Geel (BE);ROOS A H, State Institute for Quality Control of Agricultural Products (RIKILT-DLO), Wageningen (NL);TUINSTRA L G M T, State Institute for Quality Control of Agricultural Products (RIKILT-DLO), Wageningen (NL)
Bibliographic Reference: Article: Fresenius' Journal of Analytical Chemistry, Vol. 348 (1994) pp. 37-46
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