ISO INTERNATIONAL STANDARD 28439 First edition 2011-04-01 Workplace atmospheres - Characterization of ultrafine aerosols/ nanoaerosols Determination of the size distribution and number concentration using differential electrical mobility analysing systems Air des lieux de travail Caractérisation des aerosols ultrafins/ nanoaerosols Détermination de la distribution granulometrique et de la concentration en nombre a I'aide de systemes d'analyse differentielle de mobilite électrique Reference number ISO 28439:2011(E) @ ISO 2011 Not for Resale ISO28439:2011(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT ?ISO2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing 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 @IsO 2011-All rights reserved d without license from IHS Not for Resale ISO 28439:2011(E) Contents Page Foreword Introduction 1 Scope 2 Normative references.. 3 Terms and definitions 4 Symbols and abbreviated terms 4.1 Symbols... 4.2 Abbreviated terms 5 Principle 6 Equipment 6.1 6.2 Sampling line 6.3 Pre-separator .. 6.4 Particle charge conditioner 6.5 DEMC...... 6.6 Aerosol particle detector 7 Measurement strategy 8 Measuring procedure ... 8.1 Preparation.... 8.2 Sampling ..... 9 Presentation and evaluation of data.. 10 Check of DMAS performance.... .8 10.1 Check on particle classification. 10.2 Check on particle number-counting efficiency . 11 Problemsanderrors 11.1 CPC (CNC) counting efficiency.. 11.2 Particles with multiple charges... .9 11.3 Sampling losses . 11.4 Uncertainties.. 11.5 11 11.6 Sampling of fibres 11.7 Humidity . 11.8 Maintenance... Annex A (informative) Methods for determining exposure 12 Annex B (informative) List of manufacturers (non-comprehensive)... 13 Bibliography.... 14 Copyright International Organization for Standardizalon ghts reserved ii se from IHS Not for Resale