ISO INTERNATIONAL STANDARD 11352 First edition 2012-07-01 Water quality Estimation of measurement uncertainty based on validation and quality control data Qualité de I'eau-Estimation de I'incertitude de mesure basée sur des données de validation et de controle qualite Reference number ISO 11352:2012(E) ISO @ISO2012 IHS under lic ted without license from IHS Not for Resale ISO11352:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Casepostale56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2012 -All rights reserved No reproductic etworking permitted without license from IHS Not for Resale ISO 11352:2012(E) Contents Page Foreword ..iv Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols 5 Principle. 5 6 Procedure. .5 7 Preparative considerations for the estimation of measurement uncertainty 6 7.1 Specification of the measurement. 6 7.2 Specification of the parametric form in which the measurement uncertainty is reported. 8 Evaluation of available precision and bias data 8.1 Approachand criteria.. 8.2 Within-laboratoryreproducibility 8 8.3 Methodandlaboratorybias. 10 9 Calculation of the combined standard uncertainty. ..14 10 Calculation of the expanded uncertainty ..15 11 Estimation of measurement uncertainty from reproducibility standard deviation. .15 12 Report. ..15 Annex A (normative) Estimation of the standard uncertainty from range control charts .16 Annex B (informative) Examples of the estimation of measurement uncertainty 17 Bibliography 26 ili se from IHS Not for Resale