6703/1 nternational Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION+ME KAYHAPOAHAR OPFAHW3AUMR NO CTAHAAPTM3AUMW+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 ISO 6703/1-1984 (E) UDC 543.2:546.267 Ref.No.ISO6703/1-1984 (E) Descriptors : water, quality, tests, determination, cyanides, water pollution. Price based on 11 pages 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 mcmber 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 mernber bodies voting. International Standard ISO6703/1 wasprepared by Technical Cormmittee ISO/TC 147, Water quality. Internatlonal Organization for Standardization,1984 Printed in Switzerland Contents Page 0Introduction Scopeandfieldofapplication Definition 2 Sectionone:Liberationandabsorptionofhydrogencyanide 3Principle 3 Reagents 3 Apparatus 3 6 Sampling and samples 3 7 Procedure 5 Sectiontwo:Determinationofcyanideions Photometric method with pyridine/barbituric acid 8 Applicability. 6 9 Principle 9 10 Rcagents 6 11 Apparatus 6 12 Procedure. 6 13 Expressionofresults. Precision 14 7 15 Test report Section three: Determination of cyanide ions -Titrimetric method using the Tyndall effect 16Applicability 8 17 Principle and reactions 8 Reagents 18 19 Apparatus 8 20 Procedure 8 21 Expression of results 9 22 Precision 9 23 Test report 9 ili