ISO INTERNATIONAL STANDARD 11436 First edition 1993-08-01 Nickel and nickel alloys Determination of total boron content -- Curcumin molecular absorption spectrometric method Nickel et alliages de nickel -- Dosage du bore total -- Méthode par spectrométrie d'absorption moléculaire a la curcumine Reference number ISO 11436:1993(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 11436:1993(E) Foreword IsO (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 presented 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 Standard ISO 11436 was prepared by Technical Committee ISO/TC 155, Nickel and nickel alloys, Sub-Committee SC 4, Analysis of nickel alloys. Annex A of this International Standard is for information only. CISO1993 All rights reserved. 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 per- mission in writing fromthe publisher. InternationalOrganizationforStandardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland Not for Resale INTERNATIONAL STANDARD ISO 11436:1993(E) Nickel and nickel alloys --- Determination of total boron content - Curcumin molecular absorption spectrometric method 1 Scope 4 Reagents This International Standard specifies a molecular ab- During the analysis, unless otherwise stated, use only sorption spectrometric method for the determination reagents of recognized analytical grade and only dis of the total boron content in the range of 4 g/t to tilled water or water of equivalent purity. 240 g/t in nickel and nickel alloys. NOTE1 A possible chemical interference from rhenium 4.1 Hydrochloric acid, P20 = 1,18 g/ml. has been identified. 4.2 Sulfuric acid, P20 = 1,84 g/ml. 2 Normative reference 4.3 Nitric acid, P20 = 1,41 g/ml. The following standard contains provisions which, 4.4 Phosphoric acid, P2o = 1,71 g/ml. through reference in this text, constitute provisions ofthis InternationalStandard.Atthetime ofpublica- tion,the edition indicated was valid.All standards are 4.5 Sodium hypophosphite, subject to revision, and parties to agreements based monohydrate (NaH,PO,.H,O). on this International Standard are encouraged to in- vestigate the possibility of applying the most recent 4.6 Acetic acid, glacial, P20 = 1,05 g/ml. edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid The reagent must be free from aldehydes: International Standards. Aldehyde test procedure: Transfer 20 ml of the acetic IsO 5725:1986, Precision of test methods --- Deter- acid to a 50 ml beaker and add 1 ml of 1 g/l potass- mination of repeatability and reproducibility for a ium permanganate solution. The colour should not standardtestmethodbyinter-laboratorytests. disappear within 10 min. If aldehydes are present, an easily visible brown colour will develop in 15 min. 3 Principle 4.7 Acetic acid-sulfuric acid mixture, 1 + 1. Add in small portions, while stirring and cooling under Dissolution of a test portion in hydrochloric and nitric running water, one volume of the sulfuric acid (4.2) to acids.Decompositionof resistant boron compounds one volume of the acetic acid (4.6). (e.g.boronnitrides)byfumingthesamplesolution with phosphoric and sulfuric acids