ISO INTERNATIONAL STANDARD 13291 Second edition 2006-06-15 Zinc sulfide concentrates Determination of zinc Solvent extraction and EDTA titrimetric method extraction a I'aide d'un solvant et titrage a I'EDTA Referencenumber ISO 13291:2006(E) @ISO 2006 ISO13291:2006(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 downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat 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 infom the Central Secretariat at the address given below. ISO2006 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's member body in the country of the requester. ISO copyright office Case postale 56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2006 - All rights reserved ISO13291:2006(E) Contents Page Foreword 1 Scope 2 Normative referen 3 Principle 4 Reagents 5 Apparatus 6 Sample.. 6.1 Test sample 6.2 Testportion. 7 Procedure. 7.1 Numberof determinations 7.2 Blank test... 7.3 Dissolution of test portion.... 7.4 Extraction.... 7.5 Titration....... 7.6 Determinationofthetitrationfactorof theEDTAstandardsolution 8 Expressionof results 9 Precision... 9.1 Expressionofprecision. 9.2 Procedureforobtainingthefinal result 9.3 Between-laboratories precision .. 9.4 Check of trueness... 10 Test report.. Annex A (normative)Procedurefor thepreparation and determination of the mass of a predried testportion.. AnnexB(normative)Flowchart oftheprocedurefor theacceptance ofanalytical values fortest samples..... 11 AnnexC (normative)Elementsthat interferewiththis method 12 AnnexD (informative)Derivationofprecisionequations. Bibliography... 18 @ IS0 2006 All rights reserved ii ISO13291:2006(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees 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. Attention is drawn to the possibility 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. ISO 13291 was prepared by Technical Committee ISO/TC 183, Copper, lead, zinc and nickel ores and concentrates. This second edition cancels and replaces the first edition (isO 13291:1997), which has been technically revised. iv @ ISO 2006 - All rights reserved INTERNATIONALSTANDARD ISO 13291:2006(E) Zinc sulfide concentrates Determination of zinc Solvent extraction and EDTA titrimetric method WARNINGThis International Standard may involve hazardous materials, operations and equipment. It is the responsibility of the user of this International Standard to establish appropriate health and 1 Scope This International Standard specifies a solvent extraction/titrimetric method for the determination of the mass fraction of zinc in zinc sulfide concentrates. The method is applicable to zinc sulfide concentrates having a mass fr