1 Scope
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.