ISO INTERNATIONAL STANDARD 4581 Second edition 1994-08-01 Plastics --- Styrene/acrylonitrile copolymers --- Determination of residual acrylonitrile monomer content -- Gas chromatography method Plastiques Copolymeres styrenelacrylonitrile Dosage de I'acrylonitrile monomere résiduel -- Methode par chromatographie en phase gazeuse SO Reference number ISO 4581:1994(E) No reproductic networking permitted without license from IHS ISO 4581:1994(E) Foreword ISO (the International Organization for Standardization) is a worldwide of preparing International Standards is normally carried 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. IsO collaborates ciosely 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 for voting. Publication as an Internationa! Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 4581 was prepared by Technical Committee ISO/TC61,Plastics,SubcommitteeSC5,Physical-chemicalproperties This second edition cancels and replaces thefirst edition (IsO 4581:1987), the annex of which has been technically revised. Annex A forms an integral part of this International Standard. ISO1994 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 the publisher. International Organization for Standardization Case Postale 56 : CH-1211 Geneve 20 : Switzerland Printed in Switzerland i national Organization for Standardization Not for Resale ISO 4581:1994(E) INTERNATIONAL STANDARD ISO Plastics - Styrene/acrylonitrile copolymers - Determination of residual acrylonitrile monomer content - Gas chromatography method Scope detection limit of the order of 0,3 ppm to 0,4 ppm, an 1 alternative method is specified in annex A. In this This International Standard specifies a method for method, the testportion isdissolved in determining the content of residual acrylonitrile propanedioi-(1,2)-carbonate, and the solution is in- monomerinstyrene/acrylonitrilecopolymersand jected into a gas chromatograph equipped with a blends by gas chromatography. Bearing in mind that thermionic nitrogen detector. The solution also con- gas chromatography offers a wide range of possible tains propionitrile as an internal standard. conditions, the method specified in this International Standard is that shown to have been suitable in prac- 4 Reagents tice. During the analysis, use only reagents of recognized 2 Normative reference analytical grade. Special safety precautions shall be observedwhenhandlingthefollowingreagents,es- The following standard contains provisions which, pecially acrylonitrile. through reference in this text, constitute provisions of this International Standard. At the time of publi- 4.1 Dimethylformamide, of purity such that no im- cation, the edition indicated was valid. All standards purity peaks occur within the range of retention times are subject to revision, and parties to agreements of the substances to be determined. based on this International Standard are encouraged to investigate the possibility of applying the most re- 4.2 Propionitrile. cent edition of the standard indicated below. Mem- bers of IEC and ISO maintain registers of currently Acetonitrile may be used as internal standard instead valid International Standards. of propionitrile, if it has been shown that the same results are obtained. ISO 2561:1974, Plastics --- Determination of residual styrene monomer in polystyrene by gas chro- 4.3 Acrylonit