ISO INTERNATIONAL STANDARD 9174 Second edition 1998-07-15 Water quality Determination of chromium Atomic absorption spectrometric methods Qualite de I'eau - Dosage du chrome Méthodes par spectrométrie d'absorption atomique ISO Reference number ISO9174:1998(E) yIHS under itted without license from IHS Not for Resale ISO 9174:1998(E) Contents Page 1 Scope 1 2 Normative references 1 3 Determination of chromium by flame atomic absorption spectrometry.... 1 4 Determination of chromium by electrothermal atomization atomic absorption spectrometry 5 Annex A (informative) Pretreatment and digestion of sludge and sediment samples...... 8 Annex B (informative) Precision data, 9 @ISO1998 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 the publisher. International OrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet [email protected] Printed in Switzerland Copyrigh International Organization for Standardization by IHS under se from IHS Not for Resale ISO 9174:1998(E) @ ISO Foreword ISO(theInternational Organizationfor Standardization)is aworldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which atechnicalcommitteehasbeenestablishedhastherighttoberepresented on that committee. International organizations, governmental and non- governmental, in liaison with IsO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. International Standard isO 9174 was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 2, Physical, chemical, biochemical methods. This second edition cancels and replaces the first edition (IsO 9174:1990): which has been technically revised. Annexes A and B of this International Standard are for information only. ili ot for Resale