CEN/TR 16324:2012

Foreword
Introduction
1 Scope
2 Design of the study
3 Statistical evaluation
4 Results of the determination of
   "broken grains"
5 Results of the determination of
   "shrivelled grains"
6 Results of the determination of
   "other cereals"
7 Results of the determination of
   "grains damaged by pests"
8 Results of the determination of
   "grains in which the germ is
   discoloured, mottled grains"
9 Results of the determination of
   "sprouted grains"
10 Results of the determination of
   "extraneous seeds"
11 Results of the determination of
   "unsound grains"
12 Results of the determination of
   "extraneous matter"
13 Results of the determination of
   "husks"
14 Results of the determination of
   "ergot"
15 Results of the determination of
   "grain impurities"
16 Results of the determination of
   "miscellaneous impurities"
17 Results of the determination of
   "total Besatz"
18 Precision data of sample set A
19 Results of sample set A and B
Annex A (informative) - Participants
Bibliography

The term "Besatz" applies to all components of a grain sample that differ from the normal basic cereal. It includes the following groups: broken grains, shrivelled grains, other cereals, grains damaged by pests, grains with discoloured germ, grains overheated during drying, sprouted grains, extraneous seeds, unsound grains, ergot, bunted grains, extraneous matter, husks and impurities of animal origin. The amount of Besatz and its constituent groups is important for health, cleaning, milling and further processing aspects. For these reasons Besatz is a component of contracts in grain trade and also of the grain intervention system of EU. The principle of the determination of Besatz is to separate all the groups of Besatz from the normal basic cereal grains of unimpaired quality by sieving and manual selection out of a subsample and to quantify them. There are various problems in the determination of Besatz: Firstly, the identification of the different groups of Besatz depends strongly on the experience and the knowledge of the investigator. Also experienced investigators can differ in their characterization of grains. Finally, one is faced with the fact that grain, even after mixing, is rarely homogenous. In other words, if a sample was divided by a sample divider into a number of portions, the amount of a specific group of Besatz in each portion could be different, even if absolutely no human or machine error occurred in each determination. These problems will result in variation of the results of the determination. An international interlaboratory trial for the determination of Besatz in common wheat, durum wheat and rye was accomplished with 15 laboratories in order to get information on the intra- and interlaboratory variability of the determination of Besatz. The Technical Report here describes the preparation and evaluation of the results of this interlaboratory test.