ISO INTERNATIONAL STANDARD 9855 First edition 1993-10-15 Ambient air Determination of the particulate lead content of aerosols collected on filters -- Atomic absorption spectrometric method Air ambiant - Dosage du plomb dans les particules d'aerosol collectees sur des filtres - Methode par spectrometrie d'absorption atomique ISO Reference number ISO 9855:1993(E) ISO9855:1993(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of nationail standards bodies (lsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for and non-governmental, in liaison with isO, also take part in the work. isO collaborates closely with the Internationai Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval byat least 75% of the memberbodies casting a vote. isO/TC 146, Air quality, Sub-Committee SC 3, Ambient atmospheres. Annexes A, B and C form an integral part of this International Standard ISO 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfim, without per- mission in writing from the publisher. international Organization for Standardization Case Postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii ISO9855:1993(E) INTERNATIONAL STANDARD Ambient air Determination of the particulate lead content of aerosols collected on filters -- Atomic absorption spectrometric method Scope Iso 6955:1982, Analytical spectroscopic methods 1 Flame emission, atomic absorption, and atomic fluor- This International Standard specifies a method based escence - Vocabulary. on acid digestion and atomic absorption spectrometry forthechemicalanalysisofleadsamplescollectedon 3 Principle filters from ambient air. The method is applicable to ambient air samples with particulate lead contents, Particulate material collected on a filter is digested such that the amount of deposited particulate lead with acid. Any lead present is solubilized and the collected on the filter of the sampling equipment is samplesolutionanalysedbyatomicabsorptionspec- greater than 1 μg if the final determination is made trometry. by flame atomic absorption spectrometry. Final de- termination by graphite furnace atomic absorption spectrometry allows measurement of quantities of 4 Reagents less than 1 μg, but is only applicable after exper- imentalvalidationofdetectionlimits. During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity (as in 4.1). It is essential that the lead contents of reagents are constant so that reproducible Normative references blank values can be obtained. 2 The following standards contain provisions which, 4.1 Distilled or deionized water, with a lead con- throughreferenceinthistext,constituteprovisions tent less than 0,01 μg/ml and an electrical conductiv- of this International Standard. At the time of publica- ity less than 0,2 ms/m (2 μS/cm), or an electrical tion,the editions indicated were valid.All standards resistivity greater than 5 ks2'm. are subject to revision, and parties to agreements based on this International Standard are encouraged 4.2 Nitric acid (HNO3), concentrated, to investigate the possibility of applying the most re- 320 =1.42 g/ml, redistilled with a lead content less cent editions of the standards indicated below. than 0.01 μg/ml. Members of IEC and ISO maintain registers of cur- rently valid International Standards. 4.3 Nitric acid, dilute, approximately O,1 mol/l IsO648:1977,Laboratory glassware One-mark Add 10 ml of concentrated nitric acid (4.2) to 500 ml pipettes. of water (4.1) and dilute to