ISO/TS TECHNICAL SPECIFICATION 16996 First edition 2015-12-01 Solid biofuels Determination of elemental composition by X-ray fluorescence Biocarburants solides - Détermination de la composition élémentaire par fluorescence de rayons X Reference number ISO/TS 16996:2015(E) ISO International Organization for Standardization =ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02015 vided by IHS under I No reproduction or networking permitted without license from IHS IS0/TS 16996:2015(E) COPYRIGHT PROTECTED DOCUMENT IS0 2015, 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. ISO copyright office Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org icensee-ZHEJIANG INSTOF STANDARDIZAoISQ 05 - All rights reserved Not for Resale, 2016/3/29 05:45:52 etworking permitted without license from IHS IS0/TS 16996:2015(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Safety remarks. ..2 5 Symbols and abbreviated terms .3 5.1 Symbols .3 5.2 Abbreviated terms .? 6 Principle ..3 7 Apparatus 8 Interferences and sources of error ..4 9 Sample preparation. .5 9.1 Preparation principles ..5 9.2 Drying of general analysis sample material .5 9.3 Preparation of pressed pellet. ..5 10 Procedure .5 10.1 Analytical measurement conditions. .5 10.1.1Wavelength dispersive instruments .5 10.1.2 Energy dispersive instruments .6 10.2 Calibration .7 10.2.1 General 7 10.2.2 General calibration procedure. 8 10.2.3 Calibration procedure using the pressed pellet method (recommended method)8 10.3 Procedures for correcting matrix effect 9 10.3.1 Internal standard correction using Compton (incoherent) scattering method 9 10.3.2 Fundamental parameter approach .9 10.3.3 Fundamental or theoretical influence coefficient method .9 10.3.4 Empirical alpha correction. .10 10.4 Analysis of the samples. .11 11 Quality control ..11 11.1 Driftcorrectionprocedure .11 11.2 Reference materials .11 12 Calculation of the result ..11 13 Performance characteristics ..12 14 Test report ..12 Annex A (informative) Publicly available biomass reference materials .13 Bibliography ..14 iii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 thout license from IHS