ISO INTERNATIONAL STANDARD 16042 First edition 2007-02-01 IronoresGuidelinesfortheuseof certified reference materials (CRMs) Mineraisdefer-LignesdirectricespourI'utilisationdesmateriauxde referencecertifies Referencenumber ISO 16042:2007(E) @ISO2007 01:44:57MDT ISO16042:2007(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts noliabilityinthisarea. 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 parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ?ISO2007 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 memberbody in the country of the requester. ISO copyright office Casepostale56.CH-1211Geneva20 Tel.+ 4122749 0111 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published inSwitzerland @ ISO 2007 -All rights reserved HQ/998075510 without license from IHS ISO16042:2007(E) Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Principle. 5 Ore types 6 Mass-fractiondifference 7 Extractionofthetestportion 8 Two-bottle strategy. 9 Alteration of the CRM.. 10 Shewhartcontrolcharts. 11 Acceptanceofanalyticalvalues... 12 Test report.... AnnexA(informative)Exampleofthecalculationofmass-fractiondifference ational organization forStandardization'ghts reserved ili Copyright Interna from IHS 4:57 MD ISO16042:2007(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through SO technical committees. Each member body interested in a subject for which a technical committee has been InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. adopted by the technical committees are circulated to the member bodies for voting. Publication as an InternationalStandard requiresapprovalbyat least75%of thememberbodiescastingavote 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. ISO16042 was prepared byTechnical Committee ISO/TC102,Iron ore and direct reducediron, SubcommitteeSC 2, Chemicalanalysis. @ ISO 2007-All rights reserved ISO 16042:2007(E) Introduction This International Standard is intended for use in conjunction with other International Standards for the chemical analysis of iron ores. It describes recommended procedures for the use of iron ore certified reference materials (CRMs) in verifying the trueness of chemical analysis. It is recommended that CRMs also regularly. It is also recommended that CRMs be, from time to time, introduced as unknowns in laboratory proficiency testing schedules. V ited without license from IHS networkingpermitedwithoutlicensefromHS INTERNATIONALSTANDARD ISO16042:2007(E) lronoresGuidelinesfortheuseofcertifiedreference materials(CRMs) 1 Scope This International Standard describes recommended procedures for the use of CRMs that have been verify the analysis of shipment samples and the ongoing reliability of analytical results. 2