ISO/TR TECHNICAL REPORT 9686 First edition 2017-05 Direct reduced iron Determination of carbon and/or sulfur High- frequency combustion method with infrared measurement Minerais de fer préreduits - Dosage du carbone et/ou du soufre - Méthode par combustion haute fréquence et mesurage par infrarouge Reference number IS0/TR 9686:2017(E) International Organization for Standardization e=ZHEJIANG INST OF STANDARDIZATION C15956617 @ IS0 2017 ted without license from IHS IS0/TR 9686:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internationai ibrg DrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZoISQ 1.7 - All rights reserved Not for Resale, 2017/8/21 01:21:57 networking permited withoutlicense from IHS IS0/TR 9686:2017(E) Contents Page Foreword ..iv 1 Scope 2 Normative references ..1 3 Terms and definitions ..1 4 Principle 5 Reagents. ..1 6 Apparatus ..2 7 Sampling and samples ..3 7.1 Laboratory sample .3 7.2 Preparation of predried test samples 8 Procedure .3 8.1 General operating instructions .3 8.2 Test portion .3 8.3 Blanktest. 3 8.4 Calibration .4 8.4.1 Crucible preparation 4 8.4.2 Combustion .5 8.5 Determination .5 9 Expression of results .5 9.1 Calculation of mass fraction of carbon or sulfur .5 9.2 General treatment of results 5 9.2.1 Repeatabilityand permissibletolerance .5 9.2.2 Determination of analytical result .6 9.2.3 Between-laboratories precision. .6 9.2.4 Check for trueness. .7 9.2.5 Calculation of final result .8 10 Test report. .8 Annex A (informative) Crucible loading sequence. .9 Annex B (informative) Flowsheet of the procedure for the acceptance of analytical values fortestsamples. .10 Annex C (informative) Features of commercial HF combustion/infrared sulfur analysers ..11 Annex D (informative) Derivation of repeatability and permissible tolerance formulae .12 Annex E (informative) Precision data obtained by international analytical trials ..13 Bibliography ..15 iii cenSee=ZHEJIANG INSTOF STANDARDIZATION C15956617 without license from IHS