ISO INTERNATIONAL STANDARD 9622 IDF 141 Second edition 2013-09-15 Milk and liquid milk products Guidelines for the application of mid- infrared spectrometry Lait et produits laitiers liquides-Lignes directrices pour I'application de la spectrometrie dans lemoyen infrarouge Referencenumbers ISO9622:2013(E) IDF141:2013(E) CopyihtInternatinal Organization for Standardization IS0 andIDF2013 without license from IHS Not for Resale IS0 9622:2013(E) IDF141:2013(E) COPYRIGHTPROTECTEDDOCUMENT ISO0/IDF2013 All rights reserved. Unless otherwise specified, 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 or IDF at the respective address below or ISO's member body in the country of the requester ISO copyright office International DairyFederation Case postale 56. CH-1211 Geneva 20 SilverBuilding·BdAuguste Reyers70/B·B-1030Brussels Tel.+41227490111 Tel. + 32 2 733 98 88 Fax+41227490947 Fax+3227330413 E-mail copyright@iso.org E-mail info@fil-idf.org Web www.iso.org Web www.fil-idf.org Published in Switzerland @ISO and IDF2013-All rights reserved networking permited without license from IHS Not for Resale IS0 9622:2013(E) IDF141:2013(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normativereferences 3 Terms and definitions 4 Principle ..2 5 Principal characteristics of infrared instruments ..2 6 Factors affecting the measurements .2 6.1 Instrumentfactors. .2 6.2 Physico-chemical and biological factors. .5 7 Calibration of the instrument .8 7.1 Objective. .8 7.2 Spectrum calibration models. 7.3 Coresettings .9 7.4 Checking the slope and intercept .9 8 Sampling. ..10 9 Determination .10 10 Checkingdaily short-term stabilityofthe instrument .10 10.1 General .10 10.2 Preparation and storage of control samples .10 10.3 Analysis of control samples... .11 10.4 Monitoring the analytical procedure ..11 10.5 Re-adjustment of instrument settings .11 11 Precision .12 11.1 Repeatability ..12 11.2 Intra-laboratory reproducibility ..12 11.3 Reproducibility .12 12 Test report .13 Bibliography ..14 iii IHS under I thout license from IHS Not for Resale