ISO INTERNATIONAL STANDARD 10304-3 First edition 1997-08-15 Water quality - Determination of dissolved anions by liquid chromatography of ions Part 3: Determination of chromate, iodide, sulfite, thiocyanate andthiosulfate Qualite de I'eau --- Dosage des anions dissous par chromatographie des ions en phase liquide - Partie 3: Dosage des ions chromate, iodure, sulfite, thiocyanate et thiosulifate This material is reproduced from Iso documents under International Organization for Standardization (Iso) Copyright License number IHS/lcC/1996. Not for resale. No part of these ISo documents may be reproduced inanyform,electronic retrieval system or otherwise,exceptas allowed in the copyright law of the country of use, or with the prior written consent of IsO (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 73410 79),tHS ortheISOLicensor's members. SO Reference number ISO 10304-3:1997(E) Copyright Intermational Organization for Standardizatior No reproduction or networking permited without license from IHS Not for Resale ISO 10304-3:1997(E) Contents 1 scope.. 2 Normative references .. 3 Principle 2 4 Determination of iodide, thiocyanate and thiosulfate 2 .1 Reagents .... 4.2Apparatus. 4.3 Interferences . 4.4 Sampling and sample pretreatment 4.5 Procedure ... 4.6Calculation 4.7 Expression of results 4.8 Test report 5 Determination of sulfite 12 5.1Reagents 12 5.2Apparatus 15 5.3 Interferences 15 5.4 Sampling and sample pretreatment 5.5Procedure. 16 5.6Calculation 5.7 Expression of results 16 5.8 Test report ... 16 6 Determination of chromate. 16 6.1 Reagents 17 6.2Apparatus.. 18 6.3 Interferences 18 6.4 Sampling and sample pretreatment 6.5Procedure.... 18 6.6Calculation 19 6.7Expressionofresults 19 6.8 Test report ... 7 Precision 19 Annex A (informative) Interlaboratorytrials.. .20 Annex B (informative) Bibliography... 22 @ISO1997 All rights reserved.Unless otherwise specified,no part of thispublication maybe reproduced or utilized in any form or by any means, s,electronic or mechanical,including photocopying and microfilm, without permission in writing from the publisher. Intemational Organization for Standardization Case Postale 56 . CH-1211 Geneve 20 . Switzerland Internet [email protected] X.400 c=ch; a=40Onet; p=iso; o=isocs; s=central Printed in Switzerland Copyright I Noreroductoneworking emitedwithutlicense fromH Not for Resale @ ISO ISO 10304-3:1997(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (lsO member bodies). The work of preparing International Standards is normally carried out through ISO technical liaison with Iso, also take part in the work. iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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. International Standard ISO 10304-3 was prepared by Technical Committee ISO/TC 147, Water quality, SC 2, Physical, chemicaland biochemical methods. Iso 10304 consists of the following parts, under the general title Water quality - Determination of dissolived anions byliquidchromatographyofions: Part 1: Determination of fluoride, chioride, bromide, nitrate, nitrite, orthophosphate and sulfate in water with lowcontamination Part 2: Determination of bromide, chioride, nitrate, nitrite, orthophosphate and sulfate in waste water Part 3: Determination of chromate, iodide, sulfite, thiocyanate and thiosulfate Part 4: Determination of chlorate, chloride and chlorite in water with low contamination Annexes A and B of this part of ISO 10304 are for information only. ili lot for Resal