ISO INTERNATIONAL STANDARD 9388 First edition 1992-08-15 Nickel alloys - Determination of phosphorus content -- Molybdenum blue molecular absorption spectrometric method Alliages de nickel -- Dosage du phosphore -- Methode par spectrometrie d'absorption moleculaire au bleu de molybdene Reference number ISO 9388:1992(E) ded by IHS t No reproduction or networking permitted without license from IHS Not for Resale ISO 9388:1992(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isoO member bodies). The work of preparing International Standards is normaliy 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- bodies casting a vote. International Standard Iso 9388 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. ISO 1992 or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switeriand Copyright International Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 9388:1992(E) Nickel allovs -- Determination of phosphorus content Molybdenum blue molecular absorption spectrometric method 1 Scope Addition of boric, tartaric, and sulfamic acids to complex free fluoride, eliminate arsenic interfer- This International Standard specifies a molecular ence, and remove oxides of nitrogen. absorption spectrometric method for the determi- Formation and extraction of molybdophosphoric acid nation of the phosphorus content of nickel alloys in the range 0.001 % (m/m) to 0,025 % (m/m). Typical intoisobutylalcohol,reductionoftheheteropoly acid to molybdenum blue and back-extraction into compositions of somenickelafloys aregiveninan- an aqueous phase. nex A. Measurement of the absorbance of the aqueous Chromium(lil) and silica cause interference which is solution at 700 nm. eliminated in the procedure. See clause 9. 4 Reagents 2 Normative references During the analysis, uniess otherwise stated, use Thefollowingstandardscontainprovisionswhich, through reference in this text, constitute provisions only reagents of recognized analytical grade and only distilled water or water of equivalent purity. of thisInternationalStandard.At the time ofpubli- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to 4.1 Nitric/hydrochloric acid, mixture. agreements based on this International Standard are encouraged to investigate the possibility of ap- WARNING -- This acid mixture is highly corrosive plying the most recent editions of the standards in- and unstable. Noxious gases (chlorine) are liberated dicated below.Members of IEC and ISO maintain on standing. It shall be prepared and used in a fume registers of currently valid International Standards. cupboardand shall notbekeptinaclosedcontainer. Iso1042:1983,Laboratory glassware One-mark Carefully mix 25 ml of nitric acid (p20 = 1,41 g/ml) volumetric flasks. and 125 mi of hydrochloric acid (p20 = 1,18 g/ml). Iso 5725:1986, Precision of test methods -Determi- This mixture should be prepared just before use. nation of repeatability and reproducibility for a stan- dardtestmethodbyinter-laboratorytes