Water quality - Determination of dissolved oxygen - Iodometric method (ISO 5813:1983)

Specifies the so-called Winkler procedure modified in order to make allowance for certain interferences. It is the reference procedure and applicable to all types of water having concentrations greater than 0,2 mg/l, up to double saturation, which are free from interfering substances.

Wasserbeschaffenheit - Bestimmung des gelösten Sauerstoffs - Iodometrisches Verfahren (ISO 5813:1983)

Qualité de l'eau - Dosage de l'oxygène dissous - Méthode iodométrique (ISO 5813:1983)

La présente Norme internationale spécifie une méthode iodométrique pour le dosage de l'oxygène dissous dans les eaux selon le procédé dit de Winkler, modifié afin de tenir compte de certaines interférences. La méthode iodométrique est la méthode de référence pour le dosage de l'oxygène dissous dans les eaux. Elle est applicable à tout type d'eau ayant une concentration en oxygène dissous supérieure à 0,2 mg/l jusqu'à la double saturation en oxygène (environ 20 mg/l) et exempt de substances interférantes. Les substances organiques facilement oxydables -- comme les tanins, les acides humiques, les lignines -- interfèrent. Des substances sulfuriques oxydables -- comme les sulfures, la thiourée -- interfèrent, ainsi que les systèmes respirant activement qui consomment de l'oxygène. En présence de telles substances, il est préférable d'utiliser la méthode électrochimique à la sonde spécifiée dans l'ISO 5814. Les nitrites jusqu'à une concentration de 15 mg/l n'interfèrent pas dans le

Kakovost vode - Ugotavljanja raztopljenega kisika - Jodometrijska metoda (ISO 5813:1983)

General Information

Status
Published
Publication Date
08-Oct-1992
Withdrawal Date
29-Apr-1993
Technical Committee
Drafting Committee
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
21-May-2008
Completion Date
21-May-2008

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Standard
EN 25813:1996
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Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kakovost vode - Ugotavljanja raztopljenega kisika - Jodometrijska metoda (ISO 5813:1983)Wasserbeschaffenheit - Bestimmung des gelösten Sauerstoffs - Iodometrisches Verfahren (ISO 5813:1983)Qualité de l'eau - Dosage de l'oxygene dissous - Méthode iodométrique (ISO 5813:1983)Water quality - Determination of dissolved oxygen - Iodometric method (ISO 5813:1983)13.060.50VQRYLExamination of water for chemical substancesICS:Ta slovenski standard je istoveten z:EN 25813:1992SIST EN 25813:1996en01-oktober-1996SIST EN 25813:1996SLOVENSKI
STANDARD



SIST EN 25813:1996



SIST EN 25813:1996



SIST EN 25813:1996



International Standard INTERNATIONAL ORGANIZATION FOR STANDARDiZATION.MElKJ.lYHAPOAHAR OPTAHH3AlWlR fl0 CTAHAAPTH3ALWlM@ORGANISATION INTERNATIONALE DE NORMALISATION Water quality - Determination of dissolved Oxygen - lodometric method Qualit6 de l’eau - Dosage de l’oxyghe dissous - Mthode iodombique First edition - 1983-09-15 UDC 543.37 : 543.242.3 : 546.21 Ref. No. ISO 5813-1983 (E) Descriptors : watet-, quality, water treatment, iodometric analysis, determination, Oxygen, soluble matter. Price based on 5 pages SIST EN 25813:1996



Foreword lS0 (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bedies). The work of developing International Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been authorized 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 5813 was developed by Technical Committee ISO/TC 147, Water quahly, and was circulated to the member bodies in July 1982. lt has been approved by the member bodies of the following countries: Australia Germany, F.R. Austria Hungary Belgium India Canada Iran Chile Iraq China Italy Czechoslovakia Japan Denmark Korea, Rep. of Egypt, Arab Rep. of Mexico Finland Netherlands France Norway No member body expressed disapproval of the document 0 International Organization for Standardization, 1983 Poland Romania South Africa, Rep. of Spain Sweden Switzerland Thailand United Kingdom USA USSR Printed in Switzerland SIST EN 25813:1996



INTERNATIONAL STANDARD ISO 5813-1983 (EI Water quality - Determination of dissolved Oxygen - lodometric method 1 Scope and field of application This International Standard specifies an iodometric method for the determination of dissolved Oxygen in water by the so-called “Winkler procedure” modified in Order to make allowance for certain interferences. The iodometric method is the reference method for the deter- mination of dissolved Oxygen in water. lt is applicable to all types of water having dissolved Oxygen concentrations greater than 02 mg/l, up to double Saturation of Oxygen (approxi- mately 20 mg/l), which are free from intet-fering substances. Readily oxidizable organic substances such as tannins, humic acid and lignins, interfere. Oxidizable sulphur compounds such as sulphides and thiourea also interfere, as do actively respiring Systems which readily consume Oxygen. In the presence of such substances, it is preferable to use the electrochemical probe method specified in ISO 5814. Nitrites up to a concentration of 15 mg/1 do not interfere with the determination because they are destroyed by the addition of sodium azide. If oxidizing or reducing substances are present, it is necessary to make modifications to the method; these are described in clause 9. If suspended matter, capable of fixing or consuming iodine, is present, the method may be used with the modification described in the annex, but it is preferable to use the electro- Chemical probe method. 2 Reference ISO 5814, Water quality - Determination of dissolved Oxygen - Electrochemical probe method. ‘) 3 Principle Reaction of dissolved Oxygen in the Sample with freshly precipitated manganese(ll) hydroxide [formed by the addition of sodium or potassium hydroxide to manganeseIll1 sulphatel. Acidification, and Oxidation of iodide by the higher valency manganese compound so formed, liberating an equivalent 1) At present at the Stage of draft. quantity of iodine. Determination of the quantity of iodine liberated by titration with sodium thiosulphate. 4.1 Sulphuric acid, solution?) Cautiously add 500 ml of concentrated sulphuric acid (@ = 1,84 g/ml) to 500 ml water, stirring continuously. 4.2 Sulphuric acid, Solution, c(1/2 H,SOa) = 2 mol/l. 43 . Alkaline iodide-azide reagent. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equi
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