ISO-15767-2003.pdf
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1、 Reference number ISO 15767:2003(E) ISO 2003 INTERNATIONAL STANDARD ISO 15767 First edition 2003-02-15 Workplace atmospheres Controlling and characterizing errors in weighing collected aerosols Atmosphres des lieux de travail Contrle et caractrisation des erreurs de pese des arosols collects Copyrig
2、ht International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:27:37 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15767:2003(E) PDF disclaimer This PDF file may con
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4、ility of not infringing Adobes 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 pa
5、rameters 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. ISO 2003 All rights reserved. Unless other
6、wise 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 ISOs member body in the country of the requester. ISO copyright
7、 office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2003 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Techni
8、cal Standards 1/9972545001 Not for Resale, 04/18/2007 20:27:37 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15767:2003(E) ISO 2003 All rights reserved iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Weight in
9、stability Causes and minimization .2 4.1 General.2 4.2 Moisture sorption2 4.3 Electrostatic effects3 4.4 Effects of volatile compounds (other than water) .3 4.5 Handling damage 4 4.6 Buoyancy changes .4 5 Correcting for weight instability by use of blanks 4 5.1 General.4 5.2 Minimum number of blanks
10、 .4 5.3 Weighing times and sequence 4 5.4 Conditioning times5 5.5 Storage stability 5 6 Transport of samples to laboratory 5 6.1 General.5 6.2 Recommended packaging5 7 Weighing equipment and procedure.6 7.1 The balance .6 7.2 Recommended environmental controls .6 7.3 Other equipment requirements6 7.
11、4 Procedure.7 8 Recommendations for the reporting of measured mass relative to LOD and LOQ.7 Annex A (normative) Estimation of measurement errors 8 Annex B (informative) Interpretation of LOD and LOQ.12 Annex C (informative) Method evaluation example 14 Annex D (normative) Test of transportation int
12、egrity.15 Bibliography .17 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:27:37 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15767:2003(E) iv
13、 ISO 2003 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interes
14、ted in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical C
15、ommission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the tech
16、nical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO
17、shall not be held responsible for identifying any or all such patent rights. ISO 15767 was prepared by Technical Committee ISO/TC 146, Air quality, Subcommittee SC 2, Workplace atmospheres. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA
18、Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:27:37 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15767:2003(E) ISO 2003 All rights reserved v Introduction Assessment of airborne aerosol hazards in the occupational setting entails sampling onto a coll
19、ection medium, followed by analysis of the collected material. The result is generally an estimated concentration of a hazardous material in the air. The accuracy of such estimates depends on several factors, one of which relates to the specific type of analysis employed. This International Standard
20、 deals with a specific type of analysis which finds the most general application in the sampling of aerosols, namely the weighing of sampled material. Gravimetric analysis, though apparently simple, is subject to errors from instability in the mass of the sampling medium and other elements which mus
21、t be weighed. An example is provided by aerosol samplers designed to collect particles so as to agree with the inhalable aerosol sampling convention. For some sampler types, filter and cassette are weighed together to make estimates. Therefore, if the cassette, for example, absorbs or loses water be
22、tween the weighings required for a concentration estimation, then errors may arise. This International Standard describes such potential errors and provides solutions for their minimization. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA
23、 Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:27:37 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resal
24、e, 04/18/2007 20:27:37 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 15767:2003(E) ISO 2003 All rights reserved 1 Workplace atmospheres Controlling and characterizing errors in weighing collected aerosols 1 Scope This International Standard prov
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