FINAL INTERNATIONAL ISO/FDIS DRAFT STANDARD 13312 IS0/TC102/SC2 Iron ores Determination of Secretariat: SA potassium Flame atomic absorption Voting begins on: 2017-01-06 spectrometric method Voting terminates on: Minerais de fer-Dosage du potassium-Methode par 2017-03-02 spectrometrie d'absorption atomique dans la flamme RECIPIENTS OF THIS DRAFT ARE INVITED TO OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION INADDITIONTOTHEIR EVALUATIONAS Reference number BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO- LOGICAL, COMMERCIAL AND USER PURPOSES, ISO/FDIS 13312:2017(E) DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE DARDS TO WHICH REFERENCE MAY BE MADE IN International Organization NAARAikaRGULATIONS. @IS02017 cense with ISC out license from IHS IS0/FDIS 13312:2017(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 @ IS0 2017 - All rights reserved etworking permitted without license from IHS IS0/FDIS 13312:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references .1 3 Terms and definitions 4 Principle 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 Testportion 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 Oxidefactor .9 10 Test report .9 Annex A (normative) Flowsheet of the procedure for the acceptance of analytical values for testsamples .11 AnnexB (informative)Derivation of repeatabilityand permissible toleranceformulae. ..12 Annex C (informative) Precision data obtained by international analytical trials ..13 Bibliography ..14 iii withoutlicense from IHS