ISO INTERNATIONAL STANDARD 14593 First edition 1999-03-15 Water quality Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium Method by analysis of inorganic carbon in sealed vessels (cO2 headspace test) Qualite de I'eau-Evaluation en milieu aqueux de la biodégradabilite aérobieultimedescomposésorganiguesMethodeparanalysedu carbone inorganique dans des récipients hermétiquement clos (Essai au CO2 dans I'espace de téte) ISO Referencenumber ISO 14593:1999(E) HS under Not for Resale ISO 14593:1999(E) Contents 1 Scope 2 Normative reference 3 Terms and definitior 4 Principle.. 5 Test environment 4 6Reagents 7 Apparatus .. 8Procedure 5 9 Calculation and expression of results. 10 Expression of results .. 11 Validity of results 10 12 Precision of the method. 13 Test report. 11 Annex A (informative) Example of a biodegradation curve 12 Annex B (informative) Statistical treatment of results..... Annex C (informative) Interlaboratory ring test.. 14 Bibliography @ISO1999 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. InternationalOrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet [email protected] Printed in Switzerland Not for Resale @ ISO ISO14593:1999(E) 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 interested in a subject for which a technical committee has been established has liaison with isO, also take part in the work. isO 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/lEC Directives, Part 3 Draft International Standards adopted by the technical 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 SC 5, Biological methods Annexes A, B and C of this International Standard are for information only ili Not for Resale