ISO INTERNATIONAL STANDARD 29441 First edition 2010-04-01 Water quality Determination of total nitrogen after UV digestion Method using flow analysis (CFA and FIA) and spectrometric detection Qualitede I'eau-Dosage de I'azote total apres digestion UV Methodeparanalyseenflux(CFA et FIA)et detection spectrometrique Referencenumber ISO 29441:2010(E) @ISO2010 ISO 29441:2010(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 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 the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHTPROTECTEDDOCUMENT ISO 2010 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-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2010 All rights reserved ISO29441:2010(E) Contents Page Foreword Introductior 1 Scope 2 Normativereferences 3 Interferences 4 Principle. 5 Reagents 6 Apparatus..... 7 Sampling and samplepreparation... 8 Procedure... 8 9 Evaluation. 10 10 Expressionofresults 11 Test report... AnnexA(informative)Examples offlow systems (6.1or6.2)forthe determinationof total nitrogen after inline UV digestion (2 mg/l to 20 mg/l) Annex B (informative) Precision data. ..14 Bibliography 16 @ ISO 2010 All rights reserved ii ISO29441:2010(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. 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 chemicalandbiochemicalmethods iv @ISO 2010-All rights reserved ISO29441:2010(E) Introduction Methods using flow analysis enable wet chemistry procedures to be automated and are particularly suitable samples per hour). A differentiation is made between flow injection analysis (FIA, References [1][2]) and continuous flow analysis manifold. The sample preparation can be integrated into the manifold. The reaction product is measured in a flow detector (e.g.a flow photometer). @Iso 2010-Allrights reserved INTERNATIONAL STANDARD ISO29441:2010(E) Water quality - Determination of total nitrogen after UV spectrometric detection WARNING - Persons using this International Standard should be familiar with normal laboratory practice.This standard does not purport to address all of the safety problems, if any,associated with ensure compliancewithany national regulatory conditions. Waste containing cadmium in liquid or solid form shall be disposed of appropriately. IMPORTANT-It is absolutely essential that tests conducted according to this International Standard be carried out by suitably trained staff. Scope 1 This International Standard specifies a method for the determination of total nitrogen after inline UV digestion, in various types of waters, such as ground, drinking, surface, and waste waters, in mass concentrations Other mass concentration ranges are possible, provided the upper limit of the concentration range is exactly operating conditions NOTE Sea water can be analysed with changes in respect to sensitivity and adaptation of the carrier solution and calibrati