ISO INTERNATIONAL STANDARD 7027-1 Firstedition 2016-06-15 Water quality Determination of turbidity Part 1: Quantitative methods Qualité de I'eau-Détermination de la turbidité- Partie 1: Methodes quantitatives Reference number IS0 7027-1:2016(E) ISO Intemational Organization for Standardization =ZHEJIANG INSTOFSTANDARDIZATION C15956617 IS02016 No reproduction or itted without license from IHS IS0 7027-1:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,Published inSwitzerland 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. ISOcopyrightoffice 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 Intematinaibr PrganizationfoStandardization Uicensee-ZHEJIANG INST OF STANDARDIZoISQ3d6 -All rights reserved networking permited without license from IHS Notfor Resale, 2016/8/16 08:42:25 IS0 7027-1:2016(E) Contents Page Foreword ..iv Introduction. 1 Scope.. 2 Normativereferences ..1 3 Termsanddefinitions ..1 4 Samplingandsamples ..2 5 Quantitativemethods ofturbidity measurementusingoptical nephelometers and turbidimeters 2 5.1 General principles. 2 5.2 Reagents 3 5.3 Measurementofdiffuse radiation (nephelometry) 5 5.3.1 Apparatus. 5 5.3.2 Calibration 5 5.3.3 Procedure. 5 5.3.4 Expression of results. .5 5.3.5 Testreport .5 5.4 Measurementofattenuatedradiation (turbidimetry) 5 5.4.1 Apparatus. 5 5.4.2 Calibration. .6 5.4.3 Procedure. .6 5.4.4 Expression of results. .6 5.4.5 Testreport Annex A (informative) Results of an interlaboratory collaborativetrial to evaluate the suitability ofa synthetic polymerforuse as a secondary standard to formazin in turbiditymeasurements 7 Bibliography .9 iii See=ZHEJIANGINSTOFSTANDARDIZATIONC15956617 houtlicense from IHS