ISO INTERNATIONAL STANDARD 22262-2 First edition 2014-09-01 Air quality Bulk materials - Part 2: Quantitative determination of asbestos by gravimetric and microscopical methods Qualité de I'air- Materiaux solides - Partie 2: Dosage quantitatif de I'amiante en utilisant les méthodes gravimétrique et microscopique Reference number ISO 22262-2:2014(E) ISO @ IS0 2014 No repr ted without license from IHS Not for Resale IS0 22262-2:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2014 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. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproduction or networking permited without license from IHS Not for Resale IS0 22262-2:2014(E) Contents Page Foreword ..V Introduction ..vi 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Abbreviated terms ..6 5 Determination of analytical requirements ..6 6 Range. ..7 7 Limit of quantification 1 8 Principle ..8 9 Safety precautions ..8 10 Apparatus ..8 11 Reagents ..10 12 Sample size and homogeneity .10 12.1 Samplesize .10 12.2 Representative sample .10 13 Methods for gravimetric matrix reduction .11 13.1 General .11 13.2 Data recording .11 13.3 Selection and pre-treatment of a representative sub-sample ..13 13.4 Removal of organic materials by ashing .14 13.5 Acid treatment and sedimentation procedures. .15 14 Procedures for quantification of asbestos in the final residue from gravimetric matrix reduction. .18 14.1 General ..18 14.2 Examination of the residue on the filter and selection of the appropriate procedure ...19 15 Determination of asbestiform amphibole in vermiculite 25 15.1 General .25 15.2 Required size of sample for analysis .26 15.3 Sample pre-treatment .26 15.4 Separation of amphibole and measurement of the amphibole mass fraction. .28 16 Determination of asbestos in talc .29 16.1 General. 29 16.2 Determination of chrysotile in talc 29 16.3 Determination of amphibole in talc 29 17 Determination of compliance with legislative control limits .30 17.1 General 30 17.2 Gravimetry alone 30 17.3 Gravimetry combined with visual estimation 30 17.4 Gravimetry combined with point counting 30 17.5 Quantitative SEM or TEM fibre counting. .32 18 Test report ..32 Annex A (normative) Types of commercial asbestos-containing materials and optimum analytical procedures .34 Annex B (normative) Required centrifuge times for separation of amphibole in heavy liquid. ...42. iii thout license from IHS Not for Resale