ISO INTERNATIONAL STANDARD 23496 First edition 2019-07 Determination of pH value - Reference buffer solutions for the calibration of pH measuring equipment Determination de la valeur pH- Solutions tampons de reference pour I'étalonnage des appareils de mesure du pH Reference number IS0 23496:2019(E) @ IS0 2019 IS0 23496:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 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: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved