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FD CEN/TR 16875

Cereal and cereal products - Technical report of the interlaboratory study for the determination of impurities content in maize (Zea mays, L.) and sorghum (Sorghum bicolor, L.)

Edition date: 2015-12-16
In Force
Available languages: English, French
Summary: Le terme impuretés s'applique à tous les composants d'un échantillon de céréale qui diffère de la céréale normale de base. Il inclut les groupes suivants : grains brisés, autres céréales, grains attaqués par les déprédateurs, grains chauffés par séchage, grains germés, graines étrangères, grains avariés, impuretés proprement dites et impuretés d'origine animale.La détermination des impuretés consiste à séparer tous les groupes d'impuretés d'un échantillon de base de céréales de qualité inaltérée, par tamisage puis à trier manuellement un sous-échantillon et à les quantifier. La détermination des impuretés pose divers problèmes :Tout d'abord, l'identification des différents groupes d'impuretés dépend fortement de l'expérience et des connaissances de l'opérateur.Les opérateurs expérimentés peuvent également diverger dans leur caractérisation des grains.Enfin, le fait est que les céréales, même après le mélange, sont rarement homogènes. En d'autres termes, si un échantillon est divisé par un diviseur d'échantillons en un certain nombre de portions, la quantité d'un groupe spécifique d'impuretés dans chaque portion peut être différente, même lorsqu'aucune erreur humaine ni technique ne s'est produite dans les déterminations.Ces problèmes entraînent une variation des résultats de la détermination.Un essai interlaboratoires international pour la détermination des impuretés, conformément à la présente norme et impliquant 14 laboratoires de 4 pays, a été effectué sur 5 échantillons de maïs et 3 échantillons de sorgho. Les participants devaient effectuer leur détermination en double.Dix laboratoires ont soumis leurs résultats pour le jeu complet d'échantillons et deux pour le maïs seulement.Les matières soumises à l'essai allaient de : - 0,0 pourcent à 2,7 pourcent pour les grains brisés ;- 0,2 pourcent à 3,5 pourcent pour les impuretés constituées par des grains ;- 0,0 pourcent à 0,1 pourcent pour les grains germés ;- 0,5 pourcent à 3,3 pourcent pour les impuretés diverses ;- 1,8 pourcent à 8,7 pourcent pour les impuretés totales.L'objectif de l'étude est de déterminer la fidélité, la répétabilité et la reproductibilité de la méthode de détermination de la teneur en impuretés dans les échantillons de maïs et de sorgho.Les analyses ont été réalisées entre mars et avril 2011.L'étude a été réalisée conformément à l'ISO 5725:1994.
Keywords: GRAIN CROPS|GRAINS : FOOD|MAIZE .GB.|SORGHUM|CHEMICAL ANALYSIS|DETERMINATION OF CONTENT|IMPURITIES|SIEVING|SORTINGS|SAMPLING|LABORATORY TESTS|STATISTICS|TEST RESULTS|COMPARISON
ICS: 67.060-Cereals, pulses and derived products
CTN:

International Equivalence

Identic CEN/TR 16875:2015

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