ISO INTERNATIONAL STANDARD 11441 First edition 1995-02-15 Corrected and reprinted 1995-08-01 Lead sulfide concentrates Determination of lead content - Back titration of EDTA after precipitation of lead sulfate Concentrés sulfurés de plomb - Dosage du plomb - Titrage en retour de I'EDTA apres précipitation du sulfate de plomb ISO Reference number ISO 11441:1995(E) CopyrightIntemational Organization for Standadization No reproduction or networking permited without license from IHS Not for Resale ISO 11441:1995(E) Contents Page L Scope 2 Normative references 3 Principle 4 Reagents 5 Apparatus 6 Sample 7 Procedure 8 Expression of results 5 9 Precision 6 10 Test report Annexes A Procedure for the preparation and determination of the mass of a predried test portion 8 Flow sheet of the procedure for the acceptance of analytical values for test samples 10 C Derivationofprecisioneguations 11 ISO1995 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. InternationaiOrganizationforStandardization CasePostale56·CH-1211Geneve20Switzerland Printed in Switzerland ii national Organization for Standardization Noreproduction ornetworking permitted without license from IHS Not for Resale @ISO ISO 11441:1995(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 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 collaborates closely with the Internationa! Electrotechnical Commission (lEC) on all matters of electrotechnical standardization. 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. International Standard ISO 11441 was prepared by Technical Committee ISO/TC 183, Copper, lead and zinc ores and concentrates. Annexes A and B form an integral part of this International Standard. An- nex C is for information only. ii No reproduction or networking permtted without license from IHS Not for Resale