CEN TR 16875-2015 Cereal and cereal products - Technical report of the interlaboratory study for the determination of impurities content in maize (Zea mays L ) and sorghum (Sorghum.pdf
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1、BSI Standards PublicationPD CEN/TR 16875:2015Cereal and cereal products Technical report of theinterlaboratory study for thedetermination of impuritiescontent in maize (Zea mays, L.)and sorghum (Sorghum bicolor,L.)PD CEN/TR 16875:2015 PUBLISHED DOCUMENTNational forewordThis Published Document is the
2、 UK implementation of CEN/TR16875:2015.The UK participation in its preparation was entrusted to TechnicalCommittee AW/4, Cereals and pulses.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryp
3、rovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 89963 8ICS 67.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This Published Document was publis
4、hed under the authority of theStandards Policy and Strategy Committee on 30 September 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dPD CEN/TR 16875:2015TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CEN/TR 16875 September 2015 ICS 67.060 English Version Cerea
5、l 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.) Crales et produits craliers - Rapport technique de ltude interlaboratoires pour la dtermination de la teneur en impurets dans le
6、 mas (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
7、, 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 STANDAR
8、DIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR 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 worldwide for CEN national Members. Ref. No. CEN/TR 16875:2015 EPD CEN/TR 16875:2015CEN/TR
9、 16875:2015 (E) 2 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 stabili
10、ty . 6 3.5 Form . 6 4 Statistics . 7 4.1 Methodology . 7 4.2 Statistical treatment. 7 5 Results of the interlaboratory study 7 5.1 Validation of the raw results . 7 5.2 Detection of stragglers and outliers . 7 5.3 Stragglers and outliers detections 9 5.4 Statistics 10 5.5 Results 10 Annex A (informa
11、tive) Raw results . 16 A.1 Broken grains 16 A.2 Grains impurities . 17 A.3 Sprouted grains . 18 A.4 Miscellaneous impurities 19 A.5 Total impurities 20 PD CEN/TR 16875:2015CEN/TR 16875:2015 (E) 3 European foreword This document (CEN/TR 16875:2015) has been prepared by Technical Committee CEN/TC 338
12、“Cereal and cereal products”, the secretariat of which is held by AFNOR. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. PD CEN/TR 168
13、75:2015CEN/TR 16875:2015 (E) 4 Introduction The principle of the determination of impurities 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. The amount of impurities and its
14、 constituent groups is important for health, cleaning, milling and further processing aspects. For these reasons impurities content is a part of contracts in grain trade and also of the grain intervention system of the EU. At present a European standard for the determination of impurities in maize a
15、nd sorghum (EN 16378) has been developed. An international interlaboratory trial for the determination of impurities in maize and sorghum was accomplished in order to get information on the intra- and interlaboratory variability of the determination of impurities content. The technical report here d
16、escribes the preparation and evaluation of the results of this interlaboratory test. PD CEN/TR 16875:2015CEN/TR 16875:2015 (E) 5 1 Scope 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 ce
17、reals, 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 gra
18、ins 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
19、. 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 impuritie
20、s 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 in
21、volving 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 br
22、oken 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 impuriti
23、es content in maize and sorghum samples. The analyses were realized in March - April 2011. It occurs according to ISO 5725:1994. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated refer
24、ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 16378, Cereals - Determination of impurities content in maize (Zea mays, L.) and sorghum (Sorghum bicolor, L.) PD CEN/TR 16875:2015CEN/TR 16875:2015 (E)
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