6703/1 OS1) nternational Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAR OPrAHM3ALMR HIO CTAHAAPTW3AUWW-ORGANISATION INTE RNATIONALE DE NORMALISATION Water quality - Determination of cyanide Part 1: Determination of total cyanide Qualite de I'eau -- Dosage des cyanures -- Partie 1: Dosage des cyanures totaux First edition - 1984-09-01 UDC 543.2 : 546.267 Ref. No. ISO 6703/1-1984 (E) Descriptors : water, quality, tests, determination, cyanides, water pollution. Price based on 11 pages 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 circutated to the member bocies for approva! before their acceptance as Internationa! Standards by the Iso Council. They are approved in accordance with ISO procedures requiring at [east 75 % approval by the member bodies voting. International Standard .. ISO6703/1 was prepared by Technical Committee ISO/TC 147, Water quality. @ International Organization for Standardization, 1984 Printed in Switzerland etworking permitted without license from IHS Not for Resale Contents Page 0 Introduction Scope and field of application 1 2 Definition . Section one: Liberation and absorption of hydrogen cyanide 3 Principle 3 3 4 Reagents 5 Apparatus 3 6 Sampling and samples Procedure.. Section two: Determination of cyanide ions -- Photometric method with pyridine/barbituric acid 8Applicability 6 9 Principle 6 Reagents 10 11 Apparatus 6 6 12 Procedure 13 Expression of results 14 Precision. 15Test report Section three: Determination of cyanide ions -- Titrimetric method using the Tyndall effect 16 Applicability. 8 17 Principle and reactions 8 18 Reagents 8 19 Apparatus 20 Procedure. 21 Expression of results . 22 Precisior 23Test report li Copyright International Organization for Standardization ed without license from IHS Not for Resale