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|Title:||Proficiency Test on the Determination of Mineral Oil in Sunflower Oil|
|Authors:||KARASEK Lubomir; WENZL Thomas; ULBERTH Franz|
|Citation:||EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY vol. 112 no. 3 p. 321-332|
|Publisher:||WILEY-V C H VERLAG GMBH|
|Type:||Articles in periodicals and books|
|Abstract:||Following the discovery of mineral oil contamination of Ukrainian sunflower oil in April 2008, the Institute for Reference Materials and Measurements (IRMM) of the European Commission¿s Joint Research Centre (JRC) was requested by the Directorate General Health and Consumers (DG SANCO) to organise a proficiency test on the determination of mineral oil in sunflower oil. The aim of this test was to evaluate the comparability of analysis results gained by laboratories in EU and in Ukraine. The organisation of the study as well as the evaluation of the results was done in accordance with 'The International Harmonised Protocol for the Proficiency Testing of Analytical Chemistry Laboratories' and ISO Guide 43. Altogether 62 laboratories from 19 EU Member States, Switzerland and Ukraine subscribed for participation in the study. Four test samples at concentration levels between about 100 mg/kg and 350 mg/kg, comprising contaminated crude sunflower oil, contaminated refined sunflower oil, and spiked sunflower oil, and a solution of mineral oil in n-heptane were dispatched to the participants. The participants were asked to determine the mineral oil content of the test samples by application of their in-house analysis methods. In total, 55 sets of results were reported to the organisers of the study. The performance of laboratories was expressed by z-scores for the oil samples and by relative bias for the mineral oil solution in n-heptane. The percentage of successful laboratories in the determination of the mineral oil content of sunflower oil was for all sunflower oil test materials about 80%.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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