ISO INTERNATIONAL STANDARD 10378 Third edition 2016-02-15 Copper, lead and zinc sulfide concentrates Determination of gold and silver Fire assay gravimetric and flame atomic absorption spectrometric method Concentrés de sulfure de cuivre, de plomb et de zinc - Dosage de I'or et de I'argent - -Méthodegravimétriqueparessai aufeuet spectrométrie d'absorption atomique dans la flamme Reference number ISO 10378:2016(E) ISO International Organization for Standardization @ IS0 2016 HEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under ed without license from IHS IS0 10378:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,PublishedinSwitzerland 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+412274909 47 copyright@iso.org www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZoISQ s.6 - All rights reserved I by IHS unde etworking permitted without license from IHS IS0 10378:2016(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. .1 2 Normative references 3 Principle .2 3.1 General .2 3.2 Fusion. .2 3.3 Cupellation 22 3.4 Parting. 3.5 Retreatment 2 3.6 Correction for blank contamination 2 4 Reagents .2 5 Apparatus .4 6 Sample. .5 6.1 Test sample. .5 6.2 Test portion .5 7 Procedure 6 7.1 Number of determinations 6 7.2 Trial fusion .6 7.3 Blanktests .6 7.4 Charge preparation .6 7.5 Primary fusion. .7 7.6 Cupellation .8 7.7 Retreatment of residues. .8 7.8 Determination of gold in the primary bead 9 7.9 Determination of gold and silver in secondary beads and blanks, and of silver in prills... 10 7.10 Determination of silver in the parting solution .11 8 Expression of results. .12 8.1 Mass fraction of gold 12 8.2 Mass fraction of silver .13 9 Precision .14 9.1 Expression of precision .14 9.2 Method for obtaining the final result (see Annex H) .15 9.3 Precision between laboratories .15 9.4 Check of trueness. .17 9.4.1 General ..17 9.4.2 Type of certified reference material (CRM) or reference material (RM) ..18 10 Test report. ..18 Annex A (normative) Procedure for the preparation and determination of the mass of a predried test portion ..19 Annex B (normative) Trial fusion ..21 Annex C (normative) Blank determination ..22 Annex D (normative) Inquartation ..23 Annex E (normative) Determination of vaporization loss of silver during the cupellation process. ..24 Annex F (normative) Sulfuric acid - Parting ..25 Annex G (normative) Determination of impurities in parting solutions and washings ..27 iii ensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ithout license from IHS