ISO-14965-2000.pdf
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1、Reference number ISO 14965:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 14965 First edition 2000-03-15 Air quality Determination of total non- methane organic compounds Cryogenic preconcentration and direct flame ionization detection method Qualit de lair Dosage des composs organiques non mthaniques
2、totaux Mthode par prconcentration cryognique et ionisation slective directe dans la flamme ISO 14965:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which
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5、t a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2000 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
6、 microfilm, without permission in writing from either ISO at the address below or ISOs 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 22 734 10 79 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii IS
7、O 2000 All rights reserved ISO 14965:2000(E) ISO 2000 All rights reservediii ContentsPage Foreword.iv Introduction.v 1Scope 1 2Normative references1 3Terms and definitions .2 4Description of the method2 4.1Sampling.2 4.2Analysis2 5Interferences 3 6Apparatus.3 6.1Sample collection system (Figure 1)3
8、6.2Sample-canister cleaning system (Figure 2).4 6.3Analytical system (Figure 3)6 7Reagents and materials 9 8Canister cleanup and preparation9 9Sampling.10 9.1General10 9.2Sample collection 11 10Sample analysis.12 10.1Assembly12 10.2Analytical system leak check.12 10.3Sample volume determination12 10
9、.4Analytical system dynamic calibration .13 10.5Analysis procedure (see Figure 3)14 11Performance criteria and Quality Assurance16 11.1General16 11.2Standard operating procedure (SOP)17 11.3Method sensitivity, accuracy and precision.17 12Method modification18 12.1Sample metering system 18 12.2Canist
10、er cleaning.18 12.3FID system18 12.4Range18 12.5Alternative cryogenic trapping and heating systems18 12.6Sub-atmospheric pressure canister sampling .18 12.7Alternative sampling system18 13Precision and accuracy.19 13.1Precision.19 13.2Accuracy.19 Annex A (informative) Example of pressurized canister
11、 Sampling Data Sheet20 Bibliography21 -,-,- ISO 14965:2000(E) iv ISO 2000 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 carrie
12、d out through ISO technical committees. Each member body interested 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. IS
13、O collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committ
14、ees 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 International Standard may be the subject of patent rights. ISO
15、 shall not be held responsible for identifying any or all such patent rights. International Standard ISO 14965 was prepared by Technical Committee ISO/TC 146,Air quality, Subcommittee SC 3,Ambient atmospheres. Annex A of this International Standard is for information only. ISO 14965:2000(E) ISO 2000
16、 All rights reservedv Introduction Accurate measurements of ambient concentrations of total non-methane volatile organic compounds (NMVOC) are important for the control of photochemical smog because these organic compounds are primary precursors of atmospheric ozone and other oxidants. The NMVOC con
17、centrations typically found at urban sites may range up to 1 ppmC to 3 ppmC (see definition 3.4) or higher. In order to determine transport of precursors into an area, measurement of NMVOC upwind of the area may be necessary. Rural NMVOC concentrations originating from areas free from NMVOC sources
18、are likely to measure less than a few tenths of 1 ppmC. Conventional methods that depend on gas chromatography and qualitative and quantitative species evaluation are excessively difficult and expensive to operate and maintain. The method described in this International Standard involves a simple, c
19、ryogenic preconcentration procedure with subsequent direct detection with the flame ionization detector (FID). The method is sensitive and provides accurate measurements of ambient total NMVOC concentrations where species data are not required. This International Standard is intended for analysis of
20、 air samples from sampling canisters and has not been designed for continuous ambient air monitoring. Another application of this International Standard is the monitoring of the cleanliness of canisters and screening of canister samples prior to analysis. Collection of ambient air samples in pressur
21、ized canisters provides the following advantages: ?convenient integration of ambient samples over a specific time period; ?capability of remote sampling with subsequent central laboratory analysis; ?ability to ship and store samples, if necessary; ?analysis of samples from multiple sites with one an
22、alytical system; ?collection of replicate samples for assessment of measurement precision; ?specific hydrocarbon analysis may be performed with the same sample system. -,-,- INTERNATIONAL STANDARDISO 14965:2000(E) ISO 2000 All rights reserved1 Air quality Determination of total non-methane organic c
23、ompounds Cryogenic preconcentration and direct flame ionization detection method 1Scope This International Standard describes a procedure for sampling and determining concentrations of total non- methane volatile organic compounds (NMVOC) in the ambient atmosphere. This International Standard descri
24、bes the collection of cumulative samples in passivated stainless steel canisters and subsequent laboratory analysis. It describes a procedure for sampling in canisters at final pressures above atmospheric pressure (referred to as pressurized sampling). It employs a cryogenic trapping procedure for c
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