ISO INTERNATIONAL STANDARD 9963-1 First edition 1994-11-15 Water quality Determination of alkalinity - Part 1: Determination of total and composite alkalinity Qualité de I'eau -- Détermination de I'alcalinite - Partie 1: Détermination de I'alcalinité totale et composite so Reference number ISO 9963-1:1994(E) Copyright Intermational Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale ISO9963-1:1994(E) Foreword of preparing International Standards is normally carried out through sO 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 closely with the International Electrotechnical Commission (iEC) on all matters of electrotechnical standardization. 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. Internationai Standard ISO 9963-1 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 Annex A of this part of ISO 9963 is for information only C 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 ii d without license from IHS Not for Resale INTERNATIONALSTANDARDISO ISO9963-1:1994(E) Water quality -. Determination of alkalinity Part 1: Determination of total and composite alkalinity Scope ISO 5667-1:1980, Water quality Sampling Part 1: Guidance on the design of sampling pro- This part of ISO 9963 specifies a method for the grammes. titrimetric determination of alkalinity.Itis intendedfor ISO 5667-2:1991,Water quality Sampling the analysis of natural and treated water,andwaste Part 2: Guidance on sampling techniques. water, and can be used directly for waters having an alkalinity concentration of up to 20 mmol/l. For sam- ISO 6107-2:1989, Water quality ples containing higher concentrations of alkalinity, a Vocabulary Part 2. smaller test portion can be used for analysis. The recommendedlowerlimitis0,4mmol/l.Suspended IEC746-2:1982, Expression of performance matterintheformofcarbonatemayinterferewiththe electrochemicalanalyzers -Part2:pHValue. analysis. This interference can be reduced by filtration prior to the titration. Definitions The endpoint detection, using a pH-meter, is less prone to interferences than the use of the indicator. For the purposes of this part of ISO 9963, the follow ing definitions apply. 3.1 alkalinity (A): The quantitative capacity of aqueous media to react with hydrogen ions. 2 Normative references [ISO 6107-2] The following standards contain provisions which, 3.2 methyl red (methyl orange) endpoint alka through reference in this text, constitute provisions linity: An arbitrary measurement of the total alkalinity ofthispartofISO9963.Atthetimeofpublication,the (At) of water obtained by titration to the methyl red editions indicated were valid. All standards are subject (methyl orange) indicator endpoint (pH 4,5); to assess to revision, and parties to agreements based on this the equivalent hydrogen carbonate, carbonate and part of ISO 9963 are encouraged to investigate the hydroxide concentration of water. possibilityofapplyingthemostrecenteditionsofthe standards indicated below. Members of IEC and ISO 3.3 ph