ISO INTERNATIONAL STANDARD 7530-9 First edition 1993-08-15 Nickel alloys - Flame atomic absorption spectrometric analysis - Part 9: Determination of vanadium content Alliages de nickel - Analyse par spectrométrie d'absorption atomique dans laflamme- Partie 9: Dosage du vanadium Reference number ISO7530-9:1993(E) IS07530-9:1993(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work 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. International Standard ISO 7530-9 was prepared by Technical Committee iSO/TC 155, Nickel and nickel alloys, Sub-Committee SC 4, Analysis of nickelalloys. loys -Flame atomic absorption spectrometric analysis: - Part 1: General requirements and sample dissolution Part 2:Determination of cobalt content - 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 ISO1993 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 from the publisher. InternationalOrganizationforStandardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii ISO 7530-9:1993(E) INTERNATIONAL STANDARD Nickel alloys Flame atomic absorption spectrometric analysis - Part 9: Determination of vanadium content Scope Measurement of the absorbance of the resonance 1 line energy from the spectrum of vanadium and com- This part of IsO 7530 specifies a flame atomic ab- parison with that of calibration solutions at a wave- sorption spectrometric method for the determination length of 318,4 nm. of vanadium in the range of 0,05 % (m/m) to 1 % (m/m) in nickel alloys. Typical compositions of nickel alloys are given in annex B of IS0 7530-1:1990. Reagents Thegeneralrequirementsconcerningtheapparatus, In addition to the reagents listed in clause 4 of sampling, dissoiution of the test sample, atomic ab- sorption measurements, calculations and test report required. are given in ISO 7530-1. 2 Normative references 4.1 Ammonium metavanadate (NH,VO3), an alter- native to pure vanadium metal. The following standards contain provisions which, through reference in this text, constitute provisions 4.2 Strontium chloride, solution. ofthispartofisO7530.Atthetimeofpublication,the editions indicated were valid. All standards are subject Transfer 113,5 g of strontium chloride hexahydrate to revision, and parties to agreements based on this (SrCl2.6H,0) to a 600 ml beaker, dissolve in 400 ml part of IS0 7530 are encouraged to investigate the of hot water (50 °C to 60 °C), cool and transfer to a possibility of applying the most recent editions of the 1 000 ml one-mark volumetric flask. Make up to the standards indicated below. Members of IEC and ISO mark with water and mix. The strontium chloride maintain registers of currently valid International should be free of heavy metals. Standards. ISO 5725:1986, Precision of test methods Deter- 4.3 Vanadium, standard reference solution mination of repeatability and reproducibility for a (1,000 g/l). standard test method by inter-laborator