ISO INTERNATIONAL STANDARD 4939 Second edition 2016-02-01 Steel Determination of nickel Dimethylglyoxime spectrophotometric method Aciers Détermination du nickel - Méthode spectrophotométrique a la diméthylglyoxime Reference number IS0 4939:2016(E) ISO @IS0 2016 IS0 4939:2016(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+4122749 0947 copyright@iso.org www.iso.org @ IS0 2016 - All rights reserved Coovriaht Irfte IS0 4939:2016(E) Contents Page Foreword .iv 1 Scope .1 2 Normative references .1 3 Principle 4 Reagents. .1 5 Apparatus. .2 6 Sampling. 7 Procedure .2 7.1 Test portion. 2 7.2 Blanktest 2 7.3 Determination 2 7.3.1 Preparation of the test solution 7.3.2 Colour development. 3 7.3.3 Preparation of the compensating solution 7.3.4 Spectrophotometric measurement 7.4 Establishment of the calibration curve 7.4.1 Preparation of the calibration solutions 3 7.4.2 Spectrophotometric measurement 4 7.4.3 Calibration curves. 4 8 Expression of results 4 9 Precision 5 9.1 General 、 9.2 Repeatability. 5 9.3 Reproducibility 5 10 Test report .5 Annex A (informative) Additional information on the international interlaboratory test .7 Annex B (informative) Graphical representation of precision data .8 Bibliography 9 ational OraizISShrdzAh rights reserved iii