48519030081267 06-9596 G -2-80 INTERNATIONAL ISO STANDARD 9658 First edition 1990-03-01 Steel --- Determination of aluminium content Flame atomic absorption spectrometric method Aciers -Dosage de I'aluminium-- Methode par spectrometrie d'absorptionatomiquedans laflamme Reference number ISO9658:1990(E) 06-8596 ISO 9658:1990(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 which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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 approval before their acceptance as International Standards by the Iso' Council. They are approved in accordance with Iso procedures requiring at least 75 % approval by the member bodies voting. International Standard Iso 9658 was prepared by Technical Committee ISO/TC 17, Steel. Annex A forms an integral part of this International Standard. Annexes B and C are for information only. ? 1SO1990 or by any means, electronic or mechanical, Including photocopying and mlcrofitm, without permission in writing from the publisher. Internationat Organlzationfor Standardization CasePostale56CH-1211Geneve20-Switzerland Printed In Switzerland Not for Resale 06-9596. 0692T00 E06T59h INTERNATIONAL STANDARD ISO 9658:1990(E) Steel - Determination of aluminium content -- Flame atomic absorption spectrometric method 1 Scope acid-soluble aluminium: Aluminium dissolved in the acid mixture as specified in 8.3.1.1. This International Standard specifies a flame atomic absorption spectrometric method for the determi- 4 Principle nation of acid-soluble and/or total aluminium in non-alloyed steel. Dissolution of a test portion in dilute hydrochloric The method is applicable to aluminium contents be- and nitric acids. tween 0,005 % (m/m) and 0,20 % (m/m). Fusion of the acid-insoluble material with a mixture oforthoboricacid andpotassiumcarbonate 2 Normative references Spraying of the solution into a dinitrogen monoxide- acetylene flame. Thefollowingstandards containprovisions which, through reference in this text, constitute provisions Spectrometric measurement of the atomic absorp- of this International Standard. At the time of publi- tion of the 309,3 nm spectral line emitted by an alu- cation,theeditions indicatedwerevalid.Ail stand- miniumhollow cathodelamp. ards are subject to revision, and partiesto agreements based on this Internationai Standard are encouraged to investigate the possibility of ap- Reagents plying the most recent editions of the standards in- dicated below.Members of IEC and Iso maintain During the analysis, unless otherwise stated, use registers of currently valid International Standards. oniy reagents of recognized anaiytical grade and only distilled water or water of equivalent purity. iso 377:1989, Selection and preparation of samples and test pieces of wrought steels --- Part 1: Samples 5.1Pure iron, containing less than and test pieces for mechanical test. 0.0001% (m/m)of aluminium,orof lowknownalu- minium content. 1so 385-1:1984, Laboratory glassware -Burettes- Part 1: General requirements. 5.2 Hydrofluoric acid, p about 1,15 g/ml. iso 648:1977,Laboratory glassware One-mark pipettes. 5.3 Hydrochloric acid, p about 1,19 g/ml, diluted 1+1.. Iso 1042:1983, Laboratory glassware --- One-mark volumetric flasks. 5.4 Hydrochioric acid, p about 1,19 g/ml, diluted 2+ 100. Iso 5725:1986,Precision of test methods -- Determi- nation of repeatability andreproducibilityfor a 5.5 Sulfuric