ISO INTERNATIONAL STANDARD 9297 First edition 1989-11-15 Water quality -- Determination of chloride Silver nitrate titration with chromate indicator (Mohr's method) Qualite de I'eau -- Dosage des chlorures -- Titrage au nitrate d'argent avec du chromate comme indicateur (Methode de Mohr) Reference number ISO 9297:1989(E) Copyright International Organization for Standardization No reprod I by IHS un cense from IHS Not for Resale ISO 9297:1989(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 the right to be represented on that committee. International organizations, govern- mental 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with Iso procedures requiring at least 75 % approval by the memberbodies voting. International Standard IsO 9297 was prepared by Technical Committee ISO/TC147,Waterquality. CISO1989 permission in writing from the publlsher. International OrganizationforStandardizatlon Case Postale 56 · CH-1211 Geneve 20 · Swltzerland Printed in Switzerland 11 national Organization for Standardization Not for Resale ISO 9297:1989(E) Introduction Nearly all natural waters, as well as rain water and many waste waters, contain chloride ions. Concentrations can vary widely from a few milli- grams per litre in some natural waters to very high concentrations in polluted waste water, marine water and saline ground water. Copyihtintenatinal organizatinfor Standardization ii NrroductineworkingmitedwithutlieefromH Not for Resale