ISO INTERNATIONAL STANDARD 4946 Second edition 2016-02-01 Steel and cast iron Determination of copper 2,2'-Biquinoline spectrophotometric method Aciers et fontesDétermination du cuivre - Meéthode spectrophotométrique au 2,2'-biquinolyle Reference number ISO 4946:2016(E) ISO International Organization for Standardization see=ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02016 vided by IHS under I No reproduction or networking permitted without license from IHS IS0 4946:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of 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 copyright@iso.org www.iso.org Licensee-ZHEJIANG INST OF STANDARDIZAISQ 0d6 - All rights reserved Not for Resale, 2016/4/22 08:04:07 networking permited without license from IHS IS0 4946:2016(E) Contents Page Foreword ..iv 1 Scope 2 Normative references ..1 3 Principle. ..1 4 Reagents 5 Apparatus. ..2 6 Sampling. .2 7 Procedure .3 7.1 Test portion .3 7.2 Blank test .3 7.3 Determination 3 7.3.1 Preparation of the test solution .3 7.3.2 Colour development. 3 7.3.3 Preparation of the compensating solution .4 7.3.4 Spectrophotometric measurement. .4 7.4 Establishment of the calibration graph .4 7.4.1 Preparation of the calibration solutions. 4 7.4.2 Spectrophotometricmeasurement ..4 7.4.3 Calibration graph .4 8 Expression of results 9 Precision .5 9.1 General 9.2 Repeatability .6 9.3 Reproducibility ..6 10 Test report ..6 Annex A (informative) Additional information on the international interlaboratory test Annex B (informative) Graphical representation of precision data .8 Bibliography ..9 iii nSee=ZHEJIANG INST OF STANDARDIZATION C15956617 vithout license from IHS