ISO INTERNATIONAL STANDARD 5647 Second edition 2019-05 Paper and board Determination of titanium dioxide content Papier et carton - Détermination de la teneur en dioxyde de titane Reference number IS0 5647:2019(E) ISO @IS02019 IS0 5647:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 5647:2019(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Principle 5 Reagents. ..2 6 Apparatus .2 7 Selection of the sample ..3 8 Preparation of ash solution ..3 9 Reagent blank solution ..3 10 Spectrophotometric procedure .3 10.1 Preparation of the calibration graph 10.2 Preparation of the test solutions 4 10.3 Spectrophotometric determination .4 11 Flame atomic absorption spectrophotometric procedure .4 11.1 Preparation of the calibration graph. 4 11.1.1 Preparation of the calibration solution ..4 11.1.2 Adjustment of apparatus 4 11.1.3 Reagent blank determination. 5 11.1.4 Spectrophotometric measurement 5 11.1.5 Piotting the calibration graph. 5 11.2 Determination .5 11.2.1 Preparation of test solution. .5 11.2.2 Spectrophotometric measurement 5 12 Expression of results 13 Test report. @ IS0 2019 - All rights reserved ii