ISO INTERNATIONAL STANDARD 8658 First edition 1997-04-01 Carbonaceous materials for use in the production of aluminium - Green and calcined coke - Determination of trace elements by flame atomic absorption spectroscopy Produits carbonés utilisés pour la production de Ialuminium - Coke cru et calcine Determination des élements-traces par spectrométrie d'absorption atomique dans la flamme ISO Reference number ISO 8658:1997(E) No reproduction or networking permited without license from IHS Not for Resale ISO 8658:1997(E) Foreword IsoO (the International Organization for Standardization) is a worldwide 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 a technical committee has been established has the right to be represented 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. Institution (BSl) (as BS 6043: Part 2: Section 2.3:1989) and was adopted, under a special "fast-track procedure", by Technical Committee ISO/TC 47, Chemistry in parallel with its approval by the IsO member bodies. @ISO1997 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 Organization for Standardization Case postale 56 . CH-1211 Geneve 20. Switzerland internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; S=central Printed in Switzerland Provided by IHS underlicense with ISC No reproduction or networking permited without license from IHS Not for Resale ISO 8658:1997(E) INTERNATIONAL STANDARD ISO Carbonaceous materials for use in the production of aluminium : Green and calcined coke -- Determination of trace elements by flame atomic absorption spectroscopy Scope This International Standard describes a method for the determination of trace elements in green and calcined coke with an ash content of not greater than 1 % (m/m) and with individual concentrations not greater than the following: Calcium 0,025%(m/m) Chromium 0,005% (m/m) Copper 0,025 % (m/m) Iron 0,030 % (m/m) Lead 0,010 % (m/m) Magnesium 0,010% (m/m) Manganese 0,001 % (m/m) Nickel 0,050 % (m/m) Silicon 0,100% (m/m) Vanadium 0,100 % (m/m) Zinc 0,004 % (m/m) NOTE A method for the determination of ash of cokes is given in Iso 8005:1984, Carbonaceous materials used in the production of aluminium - -Greenandcalcinedcoke - Determination of ash. However, it is essential that the ash produced by that method not be used in the procedure of this international Standard because of the risk of contamination by trace elements. 2 Normative references International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated beiow. Members of IEC and Iso maintain registers of currently valid Internationa! Standards. IsO 385-1:1984, Laboratory glassware - Burettes Part 1: General requirements. IsO 835-1:1981, Laboratory glassware Graduated pipettes Part 1: General requirements. IsO 1042:1983, Laboratory glassware - One-mark volumetric flasks. ISo 3696:1987, Water for laboratory use Specification and test methods. Iso 6375:1980, Carbonaceous materials for the production of alumi