ISO INTERNATIONAL STANDARD 22682 First edition 2017-08 Iron ores Determination of trace elements Plasma spectrometric method Minerais de fer-Détermination d'eléments traces -Méthode par spectrométrie avec plasma Reference number ISO 22682:2017(E) ISO @ IS0 2017 IS0 22682:2017(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 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 ii @ IS0 2017 - All rights reserved IS0 22682:2017(E) Contents Page Foreword ..iv 1 Scope 2 Normative references .1 3 Terms and definitions 4 Principle ..2 5 Reagents. ..2 6 Apparatus .4 7 Sampling and samples ..4 7.1 Laboratory sample ..4 7.2 Preparation of predried test samples. .5 8 Procedure .5 8.1 Number of determinations .5 8.2 Testportion .5 8.3 Blank test and check test 5 8.4 Determination .5 8.4.1 Decomposition of the test portion .5 8.4.2 Adjustment of spectrometer 6 9 Calculation of results 9.1 Calibration graph 7 9.2 Correction of spectral interference .8 9.3 Standardization of calibration graph (drift correction) 9 9.4 General treatment of results. 10 9.4.1 Repeatability and permissible tolerances. .10 9.4.2 Determination of analytical result .10 9.4.3 Check for trueness. .11 9.4.4 Calculation of final result 12 9.5 Oxidefactors .12 10 Test report .12 Annex A (informative) Suggested calibration solutions ..14 Annex B (normative) Plasma spectrometer performance tests ..15 Annex C (normative) Flowchart of the procedure forthe acceptance of analytical values of testsamples ..18 Annex D (informative) Derivation of repeatability and permissible tolerance formulae ..19 Annex E (informative) Precision data obtained by international analytical trials ..20 Bibliography .25 @ IS0 2017 - All rights reserved iii