ISO INTERNATIONAL STANDARD 10523 Second edition 2008-12-15 Water quality Determination of pH Qualite de I'eau- Détermination du pH Reference number ISO 10523:2008(E) @ISO 2008 by IHS under lic Not for Resale ISO 10523:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT @ ISO2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, 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 [email protected] Web www.iso.org Published in Switzerland @ ISO 2008 - All rights reserved edwithoutlicense from IHS Not for Resale ISO 10523:2008(E) Contents Page Foreword iv Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Principle. 5 Interferences 6 Reagents 7 Apparatus 8 Sampling 9 Procedure 9.1 Preparation. 9.2 Calibration and adjustment of the measuring equipment. 9.3 Measurement of the samples 10 Expression of results 11 Test report Annex A (informative) pH values of primary standard reference solutions Annex B (informative) Operative measurements in flow systems. 8 Annex C (informative) Field measurement (on-site measurement) , Annex D (informative) Measurements of the pH value in water with low ionic strength. Annex E (informative) Performance data Bibliography.... 13 Copyright International Organization for Standardizalon ghts reserved ii se from IHS Not for Resale