ISO INTERNATIONAL STANDARD 5961 Second edition 1994-01-15 Water quality - Determination of cadmium by atomic absorption spectrometry Qualite de I'eau - Dosage du cadmium par spectrometrie d'absorption atomique ISO Reference number ISO5961:1994(E) Copyright Intemational Organization for Standardization etworking permitted without license from IHS Not for Resale ISO 5961:1994(E) Foreword IsO (the International Organization for Standardization) is a worldwide federationofnationalstandardsbodies(lsOmemberbodies).Thework 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 established has the right to be represented on that committee. International organizations, governmental and non-governmental, in 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 a vote. International Standard isO 5961 was prepared by Technical Committee ISO/TC 147. Water quality, Subcommittee SC 2, Physical, chemical, biochemicalmethods. This second edition cancels and replaces the first edition (ISO 5961:1985), of which it constitutes a technical revision. Annex A of this International Standard is for information only. ISO1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfilm, without permission in writing from the publisher. International Organizationfor Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland ii CopyightIntemationalOrganizationfor Standardization No repro d without license from IHS Not for Resale INTERNATIONAL STANDARD ISO ISO 5961:1994(E) Water quality -- Determination of cadmium by atomic absorption spectrometry Section 1: General 1.1 Scope the concentration range is 0,3 μg/l to 3 μg/l. The range of application of the method can be extended to This International Standard specifies two methods for higherconcentrationsbydilutingthewatersampleor the determination of cadmium: flame atomic absorp- by the use of smaller dosing volumes. Cadmium can tion spectrometry (AAS) (Section 2) and electrothermal atomization (AAS) (Section 3). propriate digestion procedure. 1.1.1 Determination of cadmium using AAS in an air-acetylene flame 1.2 Normative reference The method is applicable to the analysis of water and waste water when the concentration of cadmium is The following standard contains provisions which, between 0,05 mg/l and 1 mg/l. Higher concentrations can be determined after dilution of the sample. The through reference in this text, constitute provisions of this International Standard. At the time of publi range of application of the method can be extended to lower concentrations by carefully evaporating the cation,the edition indicated was valid.All standards are subject to revision, and parties to agreements water sample,previouslyacidifiedwithnitricacid based on this International Standard are encouraged Cadmium can be determined in sludges and to investigate the possibility of applying the most re- sediments after an appropriate digestion procedure avoiding the formation of a precipitate. cent edition of the standard indicated below. Mem- bers of IEC and ISO maintain registers of currently valid International Standards. 1.1.2 Determination of cadmium by eiectrothermai atomization AAS Iso 5667-3:—1), Water quality --- Sampling - Part 3: Guidance on the preservation and handling of The method is suitable for the determination of cad- samples. mium in water when, with a dosing volume of 10 μl 1) To be published. (Revision of ISO 5667-3:1985) Copyright International Organization for Standardization Not for Resale