ISO INTERNATIONAL STANDARD 15681-1 First edition 2003-12-15 Water quality Determination of orthophosphate and total phosphorus contents by flow analysis (FlA and CFA) 一 Part 1: Method by flow injection analysis (FlA) Qualitéde I'eau- - Dosage des orthophosphates et du phosphore total par analyse en flux (FIA et CFA) - Partie 1: Methode par analyse avec injection en flux (FIA) Reference number ISO 15681-1:2003(E) ISO @ ISO 2003 Copyright International Organization for Standardization Not for Resale ISO 15681-1:2003(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 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 ?ISO2003 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 yemainagazainandardizato @Iso2003-All rightsreserved mittedwithoutlicense from IHS Not for Resale ISO 15681-1:2003(E) Contents Page Foreword iv Introduction 1 Scope 2 Normative references 3 Interferences... 3.1 General interferences .. 3.2 Interferencesinthedeterminationoftotal-P 4 Principle.. 4.1 Determination of orthophosphate 4.2 Total phosphorus with manual digestion 5 Reagents 6 Apparatus. 6.1 Flow injection analysis (FIA).... 6.2 Additional apparatus .... 6.3 Additional apparatus for the determination of total phosphoru 7 Sampling and sample preparation .. 8 Procedure..... 8.1 Analysis preparation. 8.2 Instrument performance check 8.3 Reagent blank check 8.4 Calibration.... 8.5 Check of digestion efficiency for determination of total-P 8.6 Measurement. 8.7 Closing down the system 9 Calculation of results.. 10 Expression of results 11 Test report... Annex A (informative) Example of an FIA system 10 AnnexB (informative)Precision and accuracy Annex C (informative) Determination of orthophosphate-P and total-P by FIA using ascorbic acid reduction... Annex D (informative) Replacement of hydrazine sulfate by DEHA (N,N-diethylhydroxylamine) ....... 18 Bibliography Copyrght International Organizainforstandardizationrights reserved ili nse from IHS Not for Resa ISO 15681-1:2003(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work 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 beer non-governmental,inliaisonwithIsO,also take part in the work.Iso collaborates closely with the 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 Interniational Standard requires approval by at least 75 % of the member bodies casting a vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. chemical and biochemical methods. Iso 15681 consists of the following parts, under the general title Water quality- L Determination of Part1:Method