ISO INTERNATIONAL STANDARD 19396-2 First edition 2017-08 Paints and varnishes Determination of pH value - Part 2: pH electrodes with ISFET technology Peintures et vernis - Détermination de la valeur pH - Partie 2: Electrodes pH avec technique ISFET Reference number ISO 19396-2:2017(E) [so @ IS0 2017 IS0 19396-2:2017(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form writtenpermission.Permission canberequestedfromeitherIsOattheaddressbelow orIso'smemberbodyinthecountryof the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii @ IS0 2017 - All rights reserved IS0 19396-2:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Principle 5 Apparatus and materials. ..5 6 Sampling. 7 Procedure .9 7.1 Test conditions .9 7.2 Calibration ..9 7.3 Number of determinations ..9 7.4 Measuring the pH value .9 8 Evaluation .9 9 Precision ..10 9.1 General .10 9.2 Repeatability limit, r ..10 9.3 Reproducibility limit, R .10 10 Test report ..10 Annex A (informative) Determination of precision ..11 Bibliography ..13 @ IS0 2017 - All rights reserved iii