ISO INTERNATIONAL STANDARD 9963-2 First edition 1994-11-15 Water quality --- Determination of alkalinity - Part 2: Determination of carbonate alkalinity Qualite de I'eau Détermination de I'alcalinité - Partie 2: Détermination de I'alcalinite carbonate ISO Reference number ISO 9963-2:1994(E) Copyright International Organization for Standardizatior No reprodu license from IHS Not for Resale ISO 9963-2:1994(E) Foreword ISo (the International Organization for Standardization) is a worldwide federation of national 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 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. IsoO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by .the technical committees are a vote. International Standard ISO 9963-2 was prepared by Technical Committee ISO/TC 147, Water quality. Subcommittee SC 2, Physical, chemical, biochemical methods. Iso 9963 consists of the following parts, under the general title Water quality -- Determination of alkalinity. Part 1: Determination of total and composite alkalinity Part 2:Determination of carbonate alkalinity Annexes A and B of this part of IsO 9963 are for information only. ISO1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or byany means,electronic ormechanical, includingphotocopying and nicrofilm, without permission in writing from the publisher. International Organization for Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland Not for Resale ISO 9963-2:1994(E) INTERNATIONAL STANDARD ISO Water quality - Determination of alkalinity . Part 2: Determination of carbonate alkalinity Scope Is0 385-1:1984, Laboratory glassware 1 Burettes Part 1: General requirements. This part of ISO 9963 specifies a method for the Iso 3696:1987, Water for analytical laboratory use - titrimetric determination of carbonate alkalinity in natural and drinking water. Using a higher pH value for Specification and test methods. the endpoint than the method specified in IsO 5667-2:1991,Water quality IsO 9963-1, the influence of other hydrogen ac- -Sampling Part 2: Guidance on sampling techniques. ceptors, such as anions of humic acids, is reduced by the procedure. IS0 6107-2:1989, Water quality - -Vocabulary Part 2. The method is intended for samples with a carbonate alkalinity between 0,01 mmol/l and 4 mmol/l (as H+ IsO 9963-1:1994, Water guality - -Determination of equivalents). For samples containing higher concen- alkalinity - Part 1: Determination of total and com trations of alkalinity, a smaller test portion can be used posite alkalinity. for analysis. IEC 746-2:1982. Expressionof performance In this context, carbonate alkalinity is often called total of alkalinity and usually has nearly the same numerical electrochemicalanalyzersPart2:pHvalue value as methyl orange alkalinity (MO-alkalinity). The endpoint detection, using a pH-meter is less 3Definition prone to interferences than the use of the indicator. For the purposes of this part of IsO 9963, the follow- ing definition applies. 3.1 alkalinity (A): The quantitative capacity of 2 Normative references aqueous media to react with hydrogen ions. [ISO 6107-2] The following standards contain provisions which, through reference in this text, constitute provisions In this method, the endpoint is chosen in such a way of this part of IsO 9963. At the time of publication, the as to permit the full neutralization of the carbonate editions indicated were valid. All standards are subject system. to revision, and parties to agreements