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.)

The term impurities applies to all components of a grain sample that differ from the normal basic cereal. It includes the following groups: broken grains, other cereals, grains damaged by pests, grains overheated during drying, sprouted grains, extraneous seeds, unsound grains, extraneous matter and impurities of animal origin.
The principle of the determination of impurities content is to separate all the groups of impurities 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 impurities:
Firstly, the identification of the different groups of impurities 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 impurities 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 test for the determination of impurities, according to this standard and involving 14 laboratories in 4 countries, was carried out with 5 maize and 3 sorghum samples. It was asked to participants to make determination in duplicate.
Ten laboratories reported results for the complete sample set and two only for corns.
The test materials ranged between:
-   0,0 % and 2,7 % for broken grains;
-   0,2 % and 3,5 % for grain impurities;
-   0,0 % and 0,1 % for sprouted grains;
-   0,5 % and 3,3 % for miscellaneous impurities;
-   1,8 % and 8,7 % for total impurities.
The aim of the study is to determine the precision, repeatability and reproducibility of the method of determination of impurities content in maize and sorghum samples.
The analyses were realized in March - April 2011.
It occurs according to the ISO 5725:1994.

Céréales et produits céréaliers - Rapport technique de l'étude interlaboratoires pour la détermination de la teneur en impuretés dans le maïs (Zea mays, L.) et le sorgho (Sorghum bicolor, L.)

Žito in žitni proizvodi - Tehnično poročilo medlaboratorijske študije o določevanju nečistoč v koruzi (Zea mays, L.) in prosu (Sorghum bicolor, L.)

Izraz »nečistoče« se nanaša na vse sestavine vzorca zrnja, ki se razlikujejo od običajnega osnovnega žita. Vključuje naslednje skupine: lomljena zrna, druga žita, zrna, ki so jih poškodovali škodljivci, zrna, ki so se pregrela med sušenjem, nakaljena zrna, tuja semena, nezdrava zrna, tuje snovi in nečistoče živalskega izvora.
Načelo določevanja nečistoč je ločiti vse skupine nečistoč od običajnega osnovnega žita v zrnju neoslabljene kakovosti s sejanjem in ročnim prebiranjem podvzorca ter jih količinsko opredeliti. Pri določevanju nečistoč se pojavljajo različne težave.
Opredelitev različnih skupin nečistoč je na primer zelo odvisna od izkušenj in znanja preiskovalca.
Tudi izkušeni preiskovalci lahko različno določijo lastnosti zrn.
Nenazadnje je treba upoštevati dejstvo, da je zrnje tudi po mešanju redko homogeno. Drugače povedano, če bi se vzorec z razdeljevalnikom vzorca razdelil na več delov, bi se lahko količina določene skupine nečistoč med posameznimi deli razlikovala, čeprav pri posamezni določitvi zagotovo ni bilo človeške ali strojne napake.
Zaradi teh težav bodo rezultati določevanja različni.
Mednarodni medlaboratorijski preskus za določevanje nečistoč, ki je bil izveden v skladu s tem standardom in pri katerem je sodelovalo 14 laboratorijev v 4 državah, je bil izveden s 5 vzorci koruze in 3 vzorci prosa. Sodelujoči laboratoriji so morali vsako določevanje izvesti po dvakrat.
Deset laboratorijev je sporočilo rezultate za celoten sklop vzorcev, dva pa le za koruzo.
Preskusne snovi so zajemale:
– 0,0 % do 2,7 % za lomljena zrna;
– 0,2 % do 3,5 % za nečistoče zrn;
– 0,0 % do 0,1 % za nakaljena zrna;
– 0,5 % do 3,3 % za druge nečistoče;
– 1,8 % do 8,7 % za celotne nečistoče.
Cilj študije je določiti natančnost, ponovljivost in možnost reprodukcije metode za določevanje nečistoč v vzorcih koruze in prosa.
Analize so se izvajale od marca do aprila 2011.
Upoštevan je bil standard ISO 5725:1994.

General Information

Status
Published
Publication Date
08-Sep-2015
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
09-Sep-2015
Due Date
12-Dec-2016
Completion Date
09-Sep-2015

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SLOVENSKI STANDARD
SIST-TP CEN/TR 16875:2015
01-november-2015
äLWRLQåLWQLSURL]YRGL7HKQLþQRSRURþLORPHGODERUDWRULMVNHãWXGLMHRGRORþHYDQMX
QHþLVWRþYNRUX]L =HDPD\V/ LQSURVX 6RUJKXPELFRORU/
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.)
Céréales et produits céréaliers - Rapport technique de l'étude interlaboratoires pour la
détermination de la teneur en impuretés dans le maïs (Zea mays, L.) et le sorgho
(Sorghum bicolor, L.)
Ta slovenski standard je istoveten z: CEN/TR 16875:2015
ICS:
67.060 äLWDVWURþQLFHLQSURL]YRGLL] Cereals, pulses and derived
QMLK products
SIST-TP CEN/TR 16875:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CEN/TR 16875:2015

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SIST-TP CEN/TR 16875:2015


CEN/TR 16875
TECHNICAL REPORT

RAPPORT TECHNIQUE

September 2015
TECHNISCHER BERICHT
ICS 67.060
English Version

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.)
Céréales et produits céréaliers - Rapport technique de
l'étude interlaboratoires pour la détermination de la
teneur en impuretés dans le maïs (Zea mays, L.) et le
sorgho (Sorghum bicolor, L.)


This Technical Report was approved by CEN on 27 July 2015. It has been drawn up by the Technical Committee CEN/TC 338.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 16875:2015 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST-TP CEN/TR 16875:2015
CEN/TR 16875:2015 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Design of the study. 6
3.1 Conception and organization . 6
3.1.1 Method . 6
3.1.2 Participants . 6
3.1.3 Design and schedule of the study . 6
3.2 Product . 6
3.3 Fabrication . 6
3.4 Homogeneity and stability . 6
3.5 Form . 6
4 Statistics . 7
4.1 Methodology .
...

SLOVENSKI STANDARD
kSIST-TP FprCEN/TR 16875:2015
01-maj-2015
äLWRLQåLWQLSURL]YRGL7HKQLþQRSRURþLORPHGODERUDWRULMVNHãWXGLMHRGRORþHYDQMX
QHþLVWRþYNRUX]L =HDPD\V/ LQSURVX 6RUJKXPELFRORU/
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.)
Ta slovenski standard je istoveten z: FprCEN/TR 16875
ICS:
67.060 äLWDVWURþQLFHLQSURL]YRGLL] Cereals, pulses and derived
QMLK products
kSIST-TP FprCEN/TR 16875:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
kSIST-TP FprCEN/TR 16875:2015

---------------------- Page: 2 ----------------------
kSIST-TP FprCEN/TR 16875:2015

TECHNICAL REPORT
FINAL DRAFT
FprCEN/TR 16875
RAPPORT TECHNIQUE

TECHNISCHER BERICHT

March 2015
ICS
English Version
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.)



This draft Technical Report is submitted to CEN members for Technical Committee Approval. It has been drawn up by the Technical
Committee CEN/TC 338.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a Technical Report. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a Technical Report.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TR 16875:2015 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
kSIST-TP FprCEN/TR 16875:2015
FprCEN/TR 16875:2015 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Design of the study.6
3.1 Conception and organization .6
3.1.1 General .6
3.1.2 Method .6
3.1.3 Participants .6
3.1.4 Design and schedule of the study .6
3.2 Product .6
3.3 Fabrication .6
3.4 Homogeneity and stability .6
3.5 Form .7
4 Statistics .7
4.1 Methodology .
...

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