TECHNICAL ISO/TR REPORT 4688-1 First edition 2017-04 Iron ores Determination of aluminium - Part 1: Flame atomic absorption spectrometric method Mineraisde fer-Dosage de I'aluminium Partie 1: Méthodepar spectrométrie d'absorption atomique dans la flamme Reference number IS0/TR 4688-1:2017(E) os1 International Organization for Standardization @ IS0 2017 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS underI Not for Resale, 2017/8/21 01:24:0 ted without license from IHS IS0/TR 4688-1:2017(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 Intenationaibr PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZRoISQ s1.7 - All rights reserved Not for Resale, 2017/8/21 01:24:01 etworking permitted without license from IHS IS0/TR 4688-1:2017(E) Contents Page Foreword ..iv 1 Scope .1 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 Number of determinations .3 8.2 Testportion 4 8.3 Blank test and check test. .4 8.4 Determination. ..4 8.4.1 Decomposition of the test portion 4 8.4.2 Treatmentoftheresidue .4 8.4.3 Preparation of the test solution. 4 Adjustment of the atomic absorption spectrometer ..5 8.4.4 8.4.5 Atomicabsorptionmeasurements ..5 9 Expression of results .6 9.1 Calculation ofmass fraction ofaluminium .6 9.2 General treatment of results .6 9.2.1 Repeatability and permissible tolerance 6 9.2.2 Determination of analytical result .7 9.2.3 Between-laboratories precision. .7 9.2.4 Checkfor trueness. .7 9.2.5 Calculation of final result :8 9.3 Oxide factor :9 10 Test report :9 Annex A (informative) Flowsheet of the procedure for the acceptance of analytical values fortestsamples. .10 Annex B (informative) Derivation of repeatability and permissible tolerance formulae ..11 Annex C (informative) Precision data obtained by international analytical trials ..12 Bibliography ..13 iii =ZHEJIANG INSTOF STANDARDIZATION C15956617 without license from IHS