6703/2 (ISO International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPIAHW3ALWR NO CTAHAAPTW3AUWMORGANISATION INTERNATIONALE DE NORMALISATION Water quality - Determination of cyanide Part 2: Determination of easily liberatable cyanide Qualite de I'eau - Dosage des cyanures -- Partie 2: Dosage des cyanures aisement liberables First edition - 1984-09-01 UDC 543.2 : 546.267 Ref. No. ISO 6703/2-1984 (E) Descriptors:water,quality,tests,determination,cyanides,waterpollution, Price based on 11 pages without license from IHS Not for Resale 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. Every 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. 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 member bodies voting. InternationalStandard ISO6703/2 wasprepared by Technical Committee ISO/TC 147, Water quality. @ International Organization for Standardization, 1984 Printed in Switzerland 11 ted without license from IHS Not for Resale Contents Page 0 Introduction 1 Scope and field of application . 2 2 Definition Section one: Liberation and absorption of hydrogen cyanide 3 Principle. 3 4 Reagents 3 5Apparatus 3 6 Sampling and samples . 5 7 Procedure. 5 Section two: Determination of cyanide ions - Photometric method with pyridine/barbituric acid Applicability 6 8 9 Principle 6 10 Reagents 6 11 6 Apparatus 12 Procedure 6 13 Expression of results . 7 14Precision Test report . 15 Section three: Determination of cyanide ions -- Titrimetric method using the Tyndall effect 16 Applicability . 8 17 Principle and reactions 8 18Reagents 8 19 Apparatus 9 20 Procedure 21 Expressionofresults 9 22 Precision 9 9 23 Test report Copyright International Organization for Standardization sefromIHS Not for Resale