ISO INTERNATIONAL STANDARD 21814 First edition 2019-02 Fine ceramics (advanced ceramics, advanced technical ceramics) - Methods for chemical analysis of aluminium nitride powders Ceramiques techniques-Méthodesd'analyse chimiquedes poudres denitrured'aluminium Referencenumber IS021814:2019(E) ISO IS02019 IS021814:2019(E) COPYRIGHTPROTECTEDDOCUMENT @I IS02019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 orIso'smemberbody in the country of the requester. ISO copyright office CP 401: Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax: +41 22749 09 47 Email:copyright@iso.org Website: www.iso.org Published in Switzerland ii @IS02019-All rights reserved IS021814:2019(E) Contents Page Foreword ..vi 1 Scope. ...1. 2 Normativereferences ...1 3 Terms and definitions .2 4 Analytesand ranges .2 5 Preparationofthetestsample .2 5.1 General. .2 5.2 Sampling. 3 5.3 Drying. 3 5.4 Weighing .3 6 Reporting the analytical values. .3 6.1 Number of analyses. 3 6.2 Blanktest .3 6.3 Evaluation of the analytical values .3 6.4 Expressionoftheanalyticalvalues .3 7 Determination of thealuminium content .4 7.1 Classificationofthedeterminationmethods 4 7.2 Aciddecomposition-ICP-OESmethod. .4 7.2.1 Principle 4 7.2.2 Reagents .4 7.2.3 Apparatus and instruments 4 7.2.4 Procedure .5 7.2.5 Blanktest 5 7.2.6 Drawing of the calibration curve 5 7.2.7 Calculation 5 7.3 Acidpressuredecomposition-CyDTA-zincbacktitrationmethod 5 7.3.1 Principle .5 7.3.2 Reagents 6 7.3.3 Apparatus andinstruments. .6 7.3.4 Procedure. .8 7.3.5 Blanktest .8 7.3.6 Calculation .8 8 Determinationofthetotalnitrogencontent .8 8.1 Classification ofthedeterminationmethods 8 8.2 Acid pressuredecomposition-distillation separation-acidimetrictitrationmethod 9 8.2.1 Principle 9 8.2.2 Reagents.... .9 8.2.3 Apparatus 10 8.2.4 Procedure .12 8.2.5 Recoverymeasurement .12 8.2.6 Calculation .13 8.3 Directdecomposition-distillation separation-acidimetrictitrationmethod .13 8.3.1 Principle .13 8.3.2 Reagents. .13 8.3.3 Apparatus. .13 8.3.4 Procedure. .13 8.3.5 Recoverymeasurement .13 8.3.6 Calculation ..13 8.4 Inertgas fusion-thermal conductivity method .13 8.4.1 Principle ..13 8.4.2 Reagents. .14 8.4.3 Apparatus. .14 @IS0 2019-All rights reserved ili