ISO INTERNATIONAL STANDARD 10153 Second edition 1997-09-01 Steel Determination of boron content Curcumin spectrophotometric method Aciers - Dosage du bore - Methode spectrophotométrique alacurcumine ISO Reference number ISO 10153:1997(E) ISO10153:1997(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been 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 10153 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 1, Methods ofdetermination of chemical composition. revision. Annexes A to D of this international Standard are for information only. @ISO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, International Organization for Standardization Case postale 56 : CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; S=central Printed in Switzerland ii ISO 10153:1997(E) INTERNATIONAL STANDARD ISO Steel -- Determination of boron content Curcumin spectrophotometric method 1 Scope This International Standard specifies a curcumin spectrophotometric method for the determination of the boron content in steel. The method is applicable to a boron content of between 0,000 1 % (m/m) and 0,o00 5 % (m/m) only in unalloyed steel, and between 0,000 5 % (m/m) and 0,012 % (m/m) in steel. 2 Normative references International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IsO maintain registers of currently valid International Standards. ISO 385-1 : 1984, Laboratory glassware - Burettes Part 1:General requirements. IsO 648 : 1977, Laboratory glassware - One-mark pipettes. IsO 1042 :—-1), Laboratory glassware - One-mark volumetric flasks. Iso 3696 : 1987, Water for analytical laboratory use - Specification and test methods. IsO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results-— Part 1: General principles and definitions. ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results- Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method. IsO 5725-3:1994, Accuracy (trueness and precision) of measurement methods and results- Part 3: Intermediate measures of the precision of a standard measurement method. IsO 14284 :1997, Steel and iron - Sampling and preparation of samples for the determination of chemical composition. 3 Principle Dissolution of a test portion in hydrochloric and nitric acids. Decomposition of boron compounds (nitrides etc.) with orthophosphoric and sulfuric acids at a temperature of 290 °C. Formation of a coloured complex between orthoboric acid and curcumin in a buffered acetic medium. Spectrophotometric measurement at a wavelength of about 543 nm. 1) To be published. (Revision of ISO 1042:1983) 1