ISO INTERNATIONAL STANDARD 15767 Second edition 2009-06-01 Workplace atmospheres Controlling and characterizing uncertainty in weighing collected aerosols Air des lieux de travail Controle et caracterisation de Iincertitude de pesée des aérosols collectes Reference number ISO 15767:2009(E) @ ISO 2009 ISO15767:2009(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 downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISo Central Secretariat 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 COPYRIGHTPROTECTEDDOCUMENT C SO2009 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 2009 - Allrights reserved ISO 15767:2009(E) Contents Page Foreword .iv Introductiol 1 Scope 2 Terms and definitions 3 Weight instability Causes and minimization.. 3.1 General .... 3.2 Moisture sorption. 3.3 Electrostatic effects 3.4 Effects of volatile compounds (other than water). 3.5 Handling damage.. 3.6 Buoyancy changes... 4 Correcting for weight instability by use of blanks.. 4.1 General ..... 4.2 Minimumnumberofblanks... 4.3 Weighing times and sequence.... 4.4 Conditioning times .. 4.5 Storage stability..... 5 Transport of collection substrates with collected aerosol samples to laboratory.. .6 5.1 General. 5.2 Recommended packaging ... 6 Weighing equipment and procedure. 6.1 Thebalance 6.2 Recommended environmental controls..... 6.3 Other equipment requirements... 6.4 Procedure.... 7 Recommendations for the reporting of measured mass relative to LoD and LoQ ... .8 8 Estimation of the uncertainty of the analytical procedure of weighing aerosol collection substrates.... 8.1 Introduction.... 8.2 Within-laboratory estimated standard deviation sw obtained over an extended period. 9 Measures to assure the validity of previously determined measurement uncertainty... 9 9.1 Continued determination of within-laboratory reproducibility .... 9 9.2 Participation in laboratory performance proficiency testing.... 9 9.3 Laboratory self-check on weighing uncertainty ..... ..9 Annex A (normative) Uncertainty component in weighing collected aerosol. 10 AnnexB (informative) Interpretation of LOD and LOQ. .14 Annex C (informative) Method evaluation example.. Annex D (normative) Test of transportation integrity ... .17 Annex E (informative) Check on weighing uncertainty. 18 Annex F (informative) Balance uncertainty .. Bibliography.... ion'ghts reserved ili