ISO/TR TECHNICAL REPORT 19997 First edition 2018-09 Guidelines for good practices in zeta- potential measurement Lignes directrices relatives aux bonnes pratiques pour la mesure du potentiel zéta Reference number ISO/TR 19997:2018(E) International Organization for Standardization =Shenzhen Institute of Standards and Technology 9972181 @IS02018 dards Bodies Not for Resale, 2018/12/5 07:28:56 IS0/TR 19997:2018(E) COPYRIGHTPROTECTEDDOCUMENT @IS02018 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 CP401·Ch.deBlandonnet8 CH-1214 Vernier, Geneva Phone:+4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ganizationfor Standardization ensee-Shenzhen Institute of Standards andeclS0log?&s- All rights reserved rious National Standards Bodies IS0/TR 19997:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Symbols. .1 5 Principle 6 Sample preparation .2 6.1 General .2 6.2 Sampling and sample inspection .2 6.3 Sample dilution procedures. 3 6.4 Sample stability test. .3 7 Measurement uncertainty and sources of error 4 7.1 General. 4 7.2 Carryover contamination from previous samples. .4 7.3 Inappropriate sample preparation procedures 4 7.4 Inappropriate samples for electrophoretic light scattering measurement .5 7.5 Inappropriate liquid medium. 5 7.6 Incorrect entries of parameters by the operator. ..5 7.7 Airbubbles .. 6 7.8 Inappropriate theory for calculating zeta-potential from the measured electrophoretic mobility ..6 7.9 Carbon dioxide .6 7.10 Effect of the applied electric field on susceptible samples .6 Annex A (informative) Zeta-potential measurement for particles in non-polar media ..8 Bibliography 9 iii andards and Technology 9972181