ISO INTERNATIONAL STANDARD 17690 Firstedition 2015-03-15 Water quality - Determination of availabie free cyanide (pH 6) using flow injection analysis (FIA), gas- diffusion and amperometric detection QualitedeI'eau-Dosagedescyanureslibresdisponibles(pH6) par analyse avec injection en flux (FIA), diffusion de gaz et détection amperometrique Reference number ISO17690:2015(E) LSO Intermational Organization for Standardization @IS02015 ed without license from IHS IS017690:2015(E) COPYRIGHTPROTECTEDDOCUMENT ISO2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. +:4122 749 0111 Fax +4122749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland PrganizationforStandardization No reproduction or networking permited without license from IHS Not for Resale, 2015/6/2 07:13:08 IS0 17690:2015(E) Contents Page Foreword ..iv Introduction.. 1 Scope. 2 Normative references 3 Terms and definitions ..1 4 Interferences .2 4.1 Interferences by oxidizing agents .2 4.2 Interferencesbysulfide .2 5 Principle ..2 6 Reagents. .2 7 Apparatus ..4 8 Samplingandsamplepreparation .5 9 Procedure .5 Flowsystemsetup .5 9.1 9.2 Reagentblankmeasurement 6 9.3 Checkingthesuitabilityoftheflowinjection system 6 9.3.1 Electrodestabilization .6 9.3.2 Recoveryrates. .6 9.4 .7 Calibration 9.5 Sample measurement. .7 10 Calculations. .7 11 Expression of results .8 12 Test report ..8 AnnexA(informative)Exampleofaflowinjectionsystem ..9 AnnexB (normative)Determination of thereal cyanide concentration in thepotassium cyanide solution (6.5.1) ..10 AnnexC (informative)Performancedata ..11 Bibliography .12 iii thout license from IHS