ISO INTERNATIONAL STANDARD 10701 First edition 1994-04-01 Steel and iron -- Determination of sulfur content --- Methylene blue spectrophotometric method Aciers et fontes - Dosage du soufre --- Meéthode spectrophotométrique au bleu de meéthylene ISO Referencenumber ISO10701:1994(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 10701:1994(E) Foreword federation of national standards bodies (lsO 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, governmental and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closelywiththeInternational ElectrotechnicalCommission (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 avote. international Standard IsO 10701 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee Sc 1, Methods of determination of chemicalcomposition. Annexes A and B of this International Standard are for information only. ?ISO1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanicai, including photocopying and microfilm, without permission in writing from the publisher. International OrganizationforStandardization CasePostale56·CH-1211Geneve20·Switzerland Printed inSwitzerland Copyright Inte No reproduction or networking permitted without license from IHS Not for Resale ISO 10701:1994(E) INTERNATIONAL STANDARD ISO Steel and iron Determination of sulfur content - Methylene blue spectrophotometric method Scope ISO 377-2:1989, Selection and preparation of samples and test pieces of wrought steels - Part 2: Samples This International Standard specifies a methylene blue for the determination of the chemical composition. spectrophotometric method for the determination of sulfur in steel and iron. sO385-1:1984,Laboratoryglassware-Burettes Part 1: General requirements. The method is applicable to sulfur contents between 0,000 3 % (m/m)and0,010 % (m/m). However, Iso 648:1977,Laboratory glassware One-mark niobium, silicon, tantalum and titanium interfere in the pipettes. determinationof sulfur. IsO 1042:1983, Laboratory glassware - One-mark Depending on the concentration of the interfering el- volumetric flasks. ements, the application ranges and test portion masses given in table 1 apply. ISO3696:1987.Waterforanalyticallaboratoryuse Specification and test methods. Table 1 Iso 5725:1986, Precision of test methods — Deter- Maximum allowable mination of repeatability and reproducibility for a Test content of the interfering standard test method by inter-laboratory tests. portion Application elements ranges Aws % (m/m) % (m/m) Nb Ta Ti g Principle 0,000 3 to 0,5 1,0 0,3 1,0 1,0 0,001 0 Dissolution of a test portion in a mixture of 0.0010to hydrochloric and nitric acids. 1,0 2,0 0,6 2,0 0,50 0.010 Evaporation with perchloric acid until white fumes appear to remove hydrochloric and nitric acids. 2 Normative references Dissolution of the saits in hydrochloric acid. Evolution of hydrogen sulfide by reducing with a mixture of The following standards contain provisions which, hydroiodic and hypophosphorous acids in a nitrogen through reference in this text, constitute provisions atmosphere, distillation, and absorption into zinc of this International Standard. At the time of publi acetatesolution. cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements Formation of methylene blue by reacting with based on this International Standard ar