ISO INTERNATIONAL STANDARD 10349-7 First edition 1992-12-15 Photography Photographic-grade chemicals Test methods Part 7: Determination of alkalinity or acidity Photographie - Produits chimiques de qualité photographique Méthodes d'essai Partie 7: Détermination de I'alcalinité ou de I'acidité Referencenumber ISO 10349-7:1992(E) ISO10349-7:1992(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 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. International Standard ISO 10349-7 was prepared by Technical Committee ISO/TC 42, Photography. tography'- Photographic-grade chemicals - Test methods: Part 1: General Part 2: Determination of matter insoluble in water Part 3: Determination of matter insoluble in ammonium hydroxide solution - Part 4: Determination of residue after ignition -- Part 5: Determination of heavy metals and iron content Part 6: Determination of halide content -- Part 7: Determination of alkalinity or acidity Part 8: Determination of volatile matter Part 9:Reaction to ammoniacal silver nitrate - Part 10: Determination of sulfide content @ISO1992 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 microfilm, without per mission in writing from the publisher. International OrganizationforStandardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland ii ISO10349-7:1992(E) 一 Part11:Determinationofspecificgravity Part 12:Determination of density ii