ISO INTERNATIONAL STANDARD 7530-7 First edition 1992-09-15 Nickel alloys -- Flame atomic absorption spectrometric analysis -- Part 7: Determination of aluminium content Alliages de nickel --- Analyse par spectrometrie d'absorption atomique dans la famme Partie 7: Dosage de I'aluminium Reference number ISO 7530-7:1992(E) ISO 7530-7:1992(E) Foreword Iso (the International Organization for Standardization) is a woridwide 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 voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IsO 7530-7 was prepared by Technical Committee ISO/TC 155, Nickel and nickel alloys, Sub-Committee SC 4, Analysis of nickel alloys. Iso 7530 consists of the following parts, under the general title Nickel alloys - Flame atomic absorption spectrometric analysis: Part 1: General requirements and sample dissolution Part 2: Determination of cobalt content 一 Part 3: Determination of chromium content --- Part 4: Determination of copper content Part 5: Determination of iron content Part 6: Determination of manganese content Part 7: Determination of aluminium content Part 8: Determination of silicon content Part 9: Determination of vanadium content C tSO 1992 or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organizationfor Standardization Case Postale 56CH-1211 Geneve20·Switzerland Printed in Switzerland i ISO 7530-7:1992(E) INTERNATIONAL STANDARD Nickel alloys -- Flame atomic absorption spectrometric analysis Part 7: Determination of aluminium content Scope acetylene flame an atomic absorption of spectrometer This part of iso 7530 specifies a flame atomic ab- Combustion of the filter from the acid dissolution sorption spectrometric method for the determination and volatilization of silica with hydrofluoric acid. of aluminium in the range of 0,2 % (m/m) to Fusion of the residue with potassium pyrosulfate, 4 % (mjm) in nickel alioys. Typicai compositions of dissolution of the melit in dilute acid and aspiration nickel alloys are given annex of this second solution into a nitrous oxide-acetylene ISO 7530-1:1990. flame of an atomic absorption spectrometer. The general requirements concerning the appar- Measurement of the absorbance of the resonance atus, sampling, dissoiution of the test sample line energy from the spectrum of aluminim and atomic absorption measurements, caiculations and comparison with that of calibration solutions at a test report are given in IsO 7530-1. wavelength of 309,3 nm. Addition of the results found in both solutions. 2 Normative references The following standards contain provisions which, Reagents through reference in this text, constitute provisions 4 of this part of IsO 7530. At the time of publication, In addition to the reagents listed in Is0 7530-1, the the editions indicated were valid. Ail standards are subject to revision, and parties to agreements based following special reagents are required. on this part of iso 7530 are encouraged to investi- gate the possibility of applying the most recent edi- 4.1 Hydrofluoric acid, P20 =- 1,15 g/ml. tions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid WARNING -- Hydrofluoric acid is extremely irritating inte