ISO INTERNATIONAL STANDARD 7529 Second edition 2017-10 Nickel alloys Determination of chromium content Potentiometric titration method with ammonium iron(II) sulfate Alliages de nickel Détermination du chrome Méthode par titrage potentiomeétrique avec du sulfate de fer(ll) et d'ammonium Accessed by UNSW - LIBRARY on 05 Nov 2017 (Document currency not guaranteed when printed) Reference number IS0 7529:2017(E) osi @IS02017 IS0 7529:2017(E) Accessed by UNSW - LIBRARY on 05 Nov COPYRIGHT PROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form writtenpermission.Permission canberequestedfromeitherIsOattheaddressbelow orIso'smemberbodyinthecountryof the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org i @ IS0 2017 - All rights reserved IS0 7529:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Principle 5 Reagents. 6 Apparatus ..3 7 Sampling and sample preparation 8 Procedure ..4 8.1 Preparation of the test solution ..4 8.2 Determination .4 8.3 Blank test .5 8.4 Number of determination .5 9 Expression of results .5 9.1 Method of calculation. 5 9.2 Precision. 5 9.2.1 Interlaboratory tests .5 9.2.2 Statistical evaluation ..6 10 Notes on procedure. ..6 10.1 Alloys containing vanadium. ..6 10.2 Determination of the end-point 11 Test report 1 Bibliography ..8 @ IS0 2017 - All rights reserved iii