BS IS0 4691:2009 BRITISH STANDARD Iron ores Determination of titanium - Diantipyrylmethane Spectrophotometric method ICS 73.060.10 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSISO4691:2009 National foreword This British Standard is theUK implementation of ISO 4691:2009.It supersedes BS 7020-12:1988 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/58, Iron ores. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity fromlegal obligations. This British Standard Amendments/corrigendaissuedsincepublication was published under the authority ofthe Standards Policy and Strategy Date Comments Committee on 31 July 2009 BSI 2009 ISBN9780580618802 BS ISO 4691:2009 ISO INTERNATIONAL STANDARD 4691 Second edition 2009-06-15 Iron ores Determination of titanium - Diantipyrylmethane spectrophotometric method Minerais defer-Dosagedutitane-Methode spectrophotometrique audiantipyrylmethane Reference number ISO 4691:2009(E) O @ ISO 2009 BS ISO 4691:2009 ISO4691:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHTPROTECTED DOCUMENT ISO 2009 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 either Iso at the address below or ISO copyright office Case postale 56.CH-1211Geneva 20 Tel. + 4122 749 0111 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ Is0 2009All rights reserved BSISO4691:2009 ISO4691:2009(E) Contents Page Foreword. iv 1 Scope. 2 Normative references. 3 Principle. Reagents. 5 Apparatus Samplingand samples. 6 6.1 Laboratory samples.... 6.2 Preparationofpredriedtestsamples...... 7 Procedure.. 7.1 Numberofdeterminations 7.2 Blank testand check test... 7.3 Test portion.. 7.4 Determination. 7.4.1 Decomposition of thetest portion... 7.4.2 Spectrophotometric determination. 7.4.3 Preparation of calibration graph... 8 Expressionof results.... 8.1 Calculationofmassfractionoftitanium.. 8.2 General treatment of results.. 8.2.1 Repeatabilityandpermissibletolerance... 8.2.2 Determination of analytical result... 8.2.3 Between-laboratoriesprecision 8.2.4 Checkfortrueness. 8.2.5 Calculation of final result. 8.3 Oxide factor... 9 Test report 9 Annex A(normative)Flowsheetof theprocedurefortheacceptance ofanalyticalvalues fortest Annex B (informative)Derivation of repeatability and permissible tolerance equations.... 11 Annex C (informative)Precision data obtained by international analytical trials... 12 @ ISO 2009 - All rights reserved ili BSISO4691:2009 ISO4691:2009(E) Foreword (isO member bodies). The work of preparing International Standards is normally carried out through ISO InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 International Standard requires approval by at least 75%of the member bodies casting a vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO4691wasprepared byTechnical CommitteeISO/TC102,Ironoreand direct reduced iron,Subcommittee SC