ISO INTERNATIONAL STANDARD 7887 Third edition 2011-12-15 Water quality Examination and determination of colour Qualite de I'eau - Examen et determination de la couleur Reference number ISO 7887:2011(E) @ ISO 2011 IHSunder Not for Resale ISO 7887:2011(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2011 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 either Iso at the address below or ISo's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ ISO 2011 - All rights reserved itted without license from IHS Not for Resale ISO 7887:2011(E) Contents Page Foreword .iv 1 Scope 2 Normative references 3 Terms and definitions .. 4 Method A: Visual examination . 5 Method B: Determination of the true colour using optical instruments.. 3 6 Method C: Determination of true colour using optical instruments for determination of absorbance at wavelength A=410 nm ... .5 7 Method D: Visual method for the determination of the colour in natural water . .9 8 Test report. 10 Annex A (informative) Quality control , 12 Annex B (informative) Precision data 13 Bibliography ii from IHS Not for Re