ISO INTERNATIONAL STANDARD 19448 First edition 2018-01 Dentistry Analysis of fluoride concentration in aqueous solutions by use of fluoride ion-selective electrode Medecine bucco-dentaire - Analyse de la concentration en fluorure dans les solutions aqueuses en utilisant une électrode seélective des ionsfluorures Reference number IS0 19448:2018(E) so Copyright International Organization for Standardization @ IS0 2018 IS0 19448:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 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 40i: Ch. de Blandonnet 8 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Published in Switzerland Copyightilerational Organizationfor Standardization @ IS0 2018 - All rights reserved IS0 19448:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Principle .1 5 Reagents and materials .2 6 Apparatus ..2 7 Preparation .3 7.1 TISAB solution. ..3 7.2 TISAB blank solution .3 7.3 Fluoride standard solutions .3 7.4 Calibration curve. .4 8 Procedure. .5 8.1 Direct analysis technique .5 8.2 Standard addition technique .6 8.3 Dilution analysis technique. .7 8.4 Multiple sample addition technique 8.5 Internal standards technique 7 9 Technical notes about the analytical techniques .1 10 Calculations. .8 10.1 Direct analysis technique .8 10.2 Standard additions technique. ..8 10.3 Dilution analysis technique 10.4 Multiple sample addition technique .9 10.5 Internalstandardstechnique .9 11 Test report ..9 12 Trouble shooting Bibliography .11 Copyight Intematioal OrgzISSahraizAl rights reserved iii