ISO INTERNATIONAL STANDARD 7766 First edition 2003-06-15 Processing photographic wastes Analysis of cyanides Determination of hexacyanoferrate(II) and hexacyanoferrate(lll) by spectrometry Effluents de traitement photographiques - Analyse des cyanures Determination de I'hexacyanoferrate() et de I'hexacyanoferrate(l) par spectrometrie Reference number ISO 7766:2003(E) ISO @ ISO 2003 y IHS unde nse from IHS Not for Resale ISO 7766:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ?ISO2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's memberbody in the country of the requester. ISO copyright office Case postale 56.CH-1211Geneva 20 Tel. + 4122 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland Copyihtinteratinal organization for Standardization @ ISO 2003 - All rights reserved itted without license from IHS Not for Resale ISO 7766:2003(E) Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Safety and operational precautions 4 Principle. 5 Reactions 6 Reagents and materials. 7 Apparatus.. 8 Sampling and sample preparation. 6 Procedure.. 10 Expression of results 11 Test report.. Bibliography Copyrght InternationalOrganizainfsandardizatonightsreserved ii IHS unde from IHS Not for Resale ISO 7766:2003(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 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. @ ISO 2003-All rights reserved CopyrightI onal Organization for Standardization ISO 7766:2003(E) Introduction This International Standard is devoted to the analysis of photographic wastes; it encompasses the analysis of complexed iron cyanides (hexacyanoferrates) in photographic effluents. Some of the chemicals specified in the test procedures are caustic, toxic, or otherwise hazardous. Specific warning, caution and danger notices are noted but, in addition, the normal precautions required during the performanceofanychemicalprocedureshouldbeexercisedatalltimes. appropriate chemical analysis. In some cases, in-house analyses will be possible; but the use of an outside laboratory will often be required. cyanides contribute to the total cyanides in those tests in which the sample preparation breaks down the complexed cyanides. It is the purpose of this Intern