ISO INTERNATIONAL STANDARD 9831 First edition 1998-08-01 Animal feeding stuffs, animal products, and faeces or urine Determination of gross calorific value Bomb calorimeter method Aliments des animaux, produits d'origine animale et excrements ou urines - Détermination de la valeur calorifique brute - Méthode a la bombe calorimetrique Reference number ISO 9831:1998(E) by IHS under lic itted without license from IHS Not for Resale ISO 9831:1998(E) Contents 1 Scope. 2 Normative references . 3 Definitions 2 4 Principle 2 5 Reagents and materials. 2 6 Apparatus 3 7 Sampling. 4 8 Preparation of test sample and test portion .. 4 9 Procedure. 5 10 Corrections 7 11 Expression of results .. 9 12 Precision 10 13 Test report 11 Annex A (normative) Determination of the effective heat capacity of the calorimeter... 12 Annex B (normative) Special procedures for preparation of the test sample ..... 14 Annex C (informative) Method of checking that the average deviation of the rate of change of temperature is within the specified limit .... 16 Annex D (informative) Examples of calculating the results of calorific determinations .. 18 Annex E (informative) Results of interlaboratory tests. 22 Annex F (informative) Bibiography ... 23 @ISO1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization Casepostale56·CH-1211Geneve20·Switzerland Internet [email protected] Printed in Switzerland CopyrightInternational Organization for Standardization Not for Resal @ ISO ISO 9831:1998(E) Foreword IsO (the International Organization for Standardization) is a worldwide federationofnationalstandardsbodies(lSOmemberbodies).Theworkof preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which on that committee. International organizations, governmental and non- governmental, in liaison with iSO, also take part in the work. IsO collab- orates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. s are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 9831 was prepared by Technical Committee ISO/TC 34, Agricultural food products, Subcommittee SC 10, Animal feedingstuffs. Annexes A and B 3 are an integral part of this International Standard. Annexes C to F are for information only. ili Copyright International Organizationfor Standardization I without license from IHS Not for Resale