ISO INTERNATIONAL STANDARD 10313 First edition 1993-04-15 Ambient air - Determination of the mass concentration of ozone Chemiluminescence method Air ambiant - Détermination de la concentration en mass d'ozone Méthodeparchimiluminescence Referencenumber ISO 10313:1993(E) IS010313:1993(E) Foreword IsO (the International Organization for Standardization) is a woridwide federation of national standards bodies (lsO member bodies). The work of preparing International Standards is normally carried out through isO technicalcommittees.Eachmemberbodyinterestedina subjectfor which a technica! committee has been established has the rightto 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 Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies forvoting. Publication as an International a vote. International Standard 1SO 10313 was prepared by Technical Committee ISO/TC 146, Air quality, Sub-Committee SC 3, Ambient atmospheres. Annexes A and B of this International Standard are for information only. ISO1993 All rights reserved. No part of this publication may be roproduced or utilizod in any form or mission in writing from the publisher. International Organization for Standardization CasePostale56CH-1211Gonove20·Switzerland Printed in Switzerland Not for Resale ISO10313:1993(E) INTERNATIONAL STANDARD Ambient air -- Determination of the mass concentration of ozone Chemiluminescence method Scope 2 Definition For the purposes of this International Standard, the 1.1 General following definition applies. ThisInternational Standard specifies a chemi- 2.1 transfer standard: An apparatus (transportable) luminescence method for the determination of the withassociatedoperationalproceduresthatiscapable massconcentrationofozoneinambientair. of accurately measuring or reproducing ozone con- The method is applicable to the determination of the centrationstandardswhicharequantitativelyrelated to the authoritative primary standard. mass concentration of ozone between 2 μg/m3 [0,001 ppm(V/V)J and 10 mg/m3 [5 ppm(V/V)] at 'the reference conditions of 25 C and 101,3 kPa. 3Principle Ultraviolet (UV) photometry is specified as the primary The air sample is drawn continuously, at a constant calibration method because of its proven accuracy and flow rate, through a particle filter before it enters the specificity to ozone. The use of transfer standards is chemiluminescence analyser. It then flows into a re- allowed if they have been previousiy calibrated against action chamber where it is mixed with an excess flow the primary calibration method. of ethylene. ethylenereactinstan- taneouslytoproduce light inthevisibleregionwitha Limitations maximum at a wavelength of about 400 nm. The 1.2 emitted light intensity is proportional to the concen- tration of ozone in the air sample and is measured by The chemiluminescent reaction ofozone with a photomultiplier tube. The resulting voltage is ampli- ethylene is not subject to interference from any of the fied, displayed, and calibrated in terms of the ambient common air pollutants. However, particulate matter, if not removed, will accumulate in the sampling line ozone concentration. andmaycauseameasurabledestructionof ozone.If particulate matter is allowed to enter the reaction 4 Reagents and materials chamber of the analyser, it will not only scatter the emitted light but will also accumulate on the optical 4.1 Sampling line window, thereby causing further attenuation of the emitted light. Also, any nitrogen(ll) oxide in the sam- The sampling line shall be made ofmaterial that is pled air will to some extent react with the ambient inert to ozone, such as glass or fluorocarbon polymer, ozone;therefore,thetimeduringwhichtheambient and it shall be as