BS ISO 6495-1-2015 Animal feeding stuffs Determination of water-soluble chlorides content Titrimetric method《动物饲料 水溶性氯化物含量的测定 滴定法》.pdf
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1、BSI Standards PublicationBS ISO 6495-1:2015Animal feeding stuffs Determination of water-solublechlorides contentPart 1: Titrimetric methodBS ISO 6495-1:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 6495-1:2015. Itsupersedes BS 5766-5:1999 which is withdr
2、awn.The UK participation in its preparation was entrusted to TechnicalCommittee AW/10, Animal feeding stuffs.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users
3、are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 58083 3ICS 65.120Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStan
4、dards Policy and Strategy Committee on 31 July 2015.Amendments issued since publicationDate Text affectedBS ISO 6495-1:2015 ISO 2015Animal feeding stuffs Determination of water-soluble chlorides content Part 1: Titrimetric methodAliments des animaux Dtermination de la teneur en chlorures solubles da
5、ns leau Partie 1: Mthode titrimtriqueINTERNATIONAL STANDARDISO6495-1First edition2015-06-15Reference numberISO 6495-1:2015(E)BS ISO 6495-1:2015ISO 6495-1:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwise specified, no part of this public
6、ation may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the countr
7、y of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6495-1:2015ISO 6495-1:2015(E)Foreword iv1 Scope . 12 Normative references 13 Principle 14 Reagents 15 Apparatus . 36
8、 Sampling 47 Preparation of test sample . 48 Procedure. 48.1 Preparation of test solution . 48.1.1 General 48.1.2 Preparation of test solution of sample free from organic matter 48.1.3 Preparation of test solution of sample containing organic matter, excluding the products listed in 8.1.4 48.1.4 Coo
9、ked feeding stuffs, flax cakes and flour, products rich in flax flour, and other products rich in mucilage or in colloidal substances 48.2 Titration 58.3 Blank test . 59 Expression of results 610 Precision . 610.1 Interlaboratory test. 610.2 Repeatability . 710.3 Reproducibility . 711 Test report .
10、7Annex A (informative) Results of interlaboratory test 8Bibliography 9 ISO 2015 All rights reserved iiiContents PageBS ISO 6495-1:2015ISO 6495-1:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wor
11、k of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governme
12、ntal, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the
13、 ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possib
14、ility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of
15、patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as in
16、formation about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 34, Food Products, Subcommittee SC 10, Animal feeding stuffs.This first edition of ISO 6495-1
17、 cancels and replaces ISO 6495:1999, which has been technically revised.ISO 6495 consists of the following parts, under the general title Animal feeding stuffs Determination of water-soluble chloride content: Part 1: Titrimetric methodiv ISO 2015 All rights reservedBS ISO 6495-1:2015INTERNATIONAL ST
18、ANDARD ISO 6495-1:2015(E)Animal feeding stuffs Determination of water-soluble chlorides content Part 1: Titrimetric method1 ScopeThis part of ISO 6495 specifies a method for the determination of water-soluble chloride content, expressed as sodium chloride, of animal feeding stuffs.This method is app
19、licable to animal feeding stuffs containing water-soluble chloride content, expressed as sodium chloride, 0,05 %.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable to its application. For dated references, only the ed
20、ition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 3696, Water for analytical laboratory use Specification and test methodsISO 6497, Animal feeding stuffs SamplingISO 6498, Animal feeding stuffs Guidelines for sample prep
21、aration3 PrincipleThe chloride present in a test portion are dissolved in water. The solution is clarified if the product contains organic matter. It is then slightly acidified with nitric acid and the chlorides are precipitated as silver chloride by means of standard volumetric solution of silver n
22、itrate. The excess silver nitrate is titrated with a standard volumetric solution of ammonium thiocyanate or potassium thiocyanate, by Volhards method.4 ReagentsUse only reagents of recognized analytical grade.4.1 Water, complying with at least grade 3 in accordance with ISO 3696.4.2 Acetone.4.3 n-H
23、exane.4.4 Nitric acid, mass concentration 20(HNO3) = 1,38 g/ml.4.5 Dilute nitric acid, volume fraction (HNO3) = 2 %.Dilute 20 ml nitric acid (4.4) to 1000 ml with water (4.1). ISO 2015 All rights reserved 1BS ISO 6495-1:2015ISO 6495-1:2015(E)4.6 Potassium chromate solution, mass concentration (K2CrO
24、4) = 5 % in water (4.1).4.7 Ammonium iron(III) sulfate, saturated solution. Prepare from NH4Fe(SO4)212H2O dissolved in water (4.1) until saturation. Approximately 125 g ammonium iron(III) sulfate per 100 ml water is required.4.8 Activated carbon, free from chloride and not capable of adsorbing chlor
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