ISO INTERNATIONAL STANDARD 20280 First edition 2007-08-15 Soil quality Determination of arsenic, antimony and selenium in aqua regia soil extracts with electrothermal or hydride-generation atomic absorption spectrometry Qualite du sol- Dosage de I'arsenic, de I'antimoine et du sélenium dans des extraits du sol a I'eau regale par spectrométrie d'absorption atomique avec atomisation électrothermique ou generation d'hydrures Reference number ISO 20280:2007(E) @ ISO 2007 by IHS under ted without license from IHS Not for Resale ISO 20280:2007(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 downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The IsO Central Secretariat 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 COPYRIGHTPROTECTEDDOCUMENT @ISO2007 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 member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2007 - All rights reserved I without license from IHS Not for Resale ISO 20280:2007(E) Contents Page Foreword 1 Scope 2 Normative references 3 Principle. 4 Reagents 5 Apparatus 6 Procedure. 6.1 Test portion.. 6.2 Aquaregiaextractionforarsenic,antimonyandselenium 6.3 Blank test solution..... 7 Method A - Electrothermal atomic absorption spectrometry: Preparation of calibration solutions and measurement. 7.1 General.... 7.2 Calibration solutions for arsenic 7.3 Calibration solutions for antimony 7.4 Calibration solutions for selenium. 7.5 Calibration and determination with ETAAS measurement. 8 Method B Hydride-generation atomic absorption spectrometry: Preparation of calibration solutions and measurement........... 8.1 Pre-reduction and calibration for the determination of arsenic .. 8.2 Pre-reduction and calibration for the determination of antimony .. 8.3 Pre-reductionand calibrationforthedeterminationof selenium. 8.4 Measurement of calibration and test solutions by hydride-generation atomic absorption spectrometry ... 8 9 Plotting the calibration graph.. 8 10 Calculation... 10.1 General...... 10.2 Calculation according to the method of standard additions.. 9 11 Expression of results 9 12 Interferences 9 13 Precision 10 14 Test report 14 Bibliography 5 CopyrghtInternationalOrganizaionsandardizaoghtsreserved ii Not for Resale ISO 20280:2007(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with isO, also take part in the work. iso collaborates closely with the 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. rights. IsO shall not be held responsible for identifying a