ISO INTERNATIONAL STANDARD 7530-8 First edition 1992-09-15 Nickel alloys --- Flame atomic absorption spectrometric analysis - Part 8: Determination of silicon content Alliages de nickel -- Analyse par spectrometrie d'absorption atomique dans la flamme Partie 8: Dosage du silicium Reference number ISO 7530-8:1992(E) ISO 7530-8:1992(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 Internationa! Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft Internationai 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. Internationat Standard 1so 7530-8 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 generai title Nickel alloys - 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 一 Part 5: Determination of iron content 一 -- Part 6: Determination of manganese content -- Part 7: Determination of aluminium content -- Part 8: Determination of silicon content Part 9: Determination of vanadium content ISO 1992 or by any means, electronic or mechanicai, includirng photocopying and microfilm, without permission in writing from the publisher. internationai Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD ISO 7530-8:1992(E) Nickel alloys --- Flame atomic absorption spectrometric analysis Part 8: Determination of silicon content Measurement of the absorbance of the resonance Scope 1 line energy from the spectrum of silicon and com- This part of iso 7530 specifies a flame atomic ab- parison with that of calibration solutions at a wave- length of 251,6 nm. sorption spectrometric method for the determination of silicon in the range of 0,2 % (m/m) to 1 % (m/m) in nickel alloys. Typical compositions of nickel alloys 4 Reagents are given in annex B of isO 7530-1:1990. The general requirements concerning the appar- In addition to the reagents listed in Iso 7530-1, the following special reagents are required. atus, sampling, dissolution of the test sample atomic absorption measurements, caiculations and test report are given in ISO 7530-1. 4.1 Hydrofluoric acid, P20 = 1,15 g/ml. WARNING -- Hydrofluoric acid is extremely irritating Normative references 2 and corrosive to skin and mucous membranes, producing severe skin burns which are slow to heal. The following standards contain provisions which, In the case of contact with skin, wash well with wa- through reference in this text, constitute provisions ter and seek medical advice. of this part of ISO 7530. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based 4.2 Hydrofluoric acid, p20 = 1,15 g/ml, diluted on this part of IsO 7530 are encouraged to investi- 1 + 9. gate the possibility of applying the most recent edi. tions of the standards indicated below. Members of 4.3 Lithium chloride (LiCl), solution. IEC and iSO maintain registers of currently valid International Standards. Transfer 25 g of lithium chloride to a 250 ml beaker and dissolve in 150 ml of warm water