ISO INTERNATIONAL STANDARD 13313 Third edition 2017-03 Iron ores Determination of sodium Flame atomic absorption spectrometric method Minerais de fer - Dosage du sodium - Methode par spectrométrie d'absorption atomique dans la flamme Reference number IS013313:2017(E) osi @ IS0 2017 IS0 13313:2017(E) COPYRIGHT PROTECTED DOCUMENT @ 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 writtenpermission.Permission canberequestedfromeitherIsOattheaddressbelow orIso'smemberbodyinthecountryof the requester. ISO copyrightoffice 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 13313:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Principle ..1 5 Reagents. ..2 6 Apparatus ..2 7 Sampling and samples ..4 7.1 Laboratory sample ..4 7.2 Preparation of predried test samples. .4 8 Procedure ..4 8.1 Number of determinations 4 8.2 Test portion 4 8.3 Blank test and check test. 4 8.4 Determination .5 8.4.1 General .5 8.4.2 Decomposition of the test portion .5 8.4.3 Treatment of the solution 5 8.4.4 Preparation of the set of calibration solutions 5 8.4.5 Adjustment of atomic absorption spectrometer .6 8.4.6 Atomic absorption measurements .6 9 Expression of results .6 9.1 Calculation of mass fraction of potassium .6 9.2 General treatment of results .7 9.2.1 Repeatability and permissible tolerance .7 9.2.2 Determination of analytical result .7 9.2.3 Between-laboratories precision. 7 9.2.4 Check for trueness. ..8 9.2.5 Calculation of final result .9 9.3 Oxide factor 9 10 Test report .9 Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for testsamples .11 Annex B (informative) Derivation of repeatability and permissible tolerance formulae. ..12 Annex C (informative) Precision data obtained by international analytical trials ..13 Bibliography ..14 @ IS0 2017 - All rights reserved ii