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EN ISO 23696-1:2025

Water quality - Determination of nitrate in water using small-scale sealed tubes - Part 1: Dimethylphenol colour reaction (ISO 23696-1:2023)

Edition date: 2025-12-17
In Force
Available languages: French, English
Summary: This document specifies a method for the determination of nitrate as NO3-N in water of various origin such as natural water (including groundwater, surface water and bathing water), drinking water and wastewater, in a measuring range of concentration between 0,10 mg/l and 225 mg/l of N03-N using the small-scale sealed tube method. Different measuring ranges of small-scale sealed tube methods can be required. The measuring ranges can vary depending on the type of the small-scale sealed tube method of different manufacturers. It is up to the user to choose the small-scale sealed tube test with the appropriate application range or to adapt samples with concentrations exceeding the measuring range of a test by preliminary dilution. NOTE 1   The results of a sealed-tube test are most precise in the middle of the application range of the test. Manufacturers' small-scale sealed tube methods are based on dimethylphenol colour reaction depending on the typical operating procedure of the small-scale sealed tube used, see Clause 9. NOTE 2   Laws, regulations or standards can require that the data is expressed as NO3- after conversion with the stoichiometric conversion factor 4,426 81 in Clause 11. NOTE 3   In the habitual language, use of sewage treatment and on the displays of automated sealed-tube test devices, NO3 without indication of the negative charge has become the common notation for the parameter nitrate and especially for the parameter nitrate-N. This notation is adopted in this document even though not being quite correct chemical nomenclature.

Le présent document spécifie une méthode de détermination du nitrate en tant que NO3-N dans des eaux d’origines diverses telles que l’eau naturelle (y compris les eaux souterraines, les eaux de surface et les eaux de baignade), l’eau potable et les eaux usées, dans une plage de concentration de mesure comprise entre 0,10 mg/l et 225 mg/l de N03-N en utilisant la méthode à petite échelle en tubes fermés. Différentes plages de mesure des méthodes à petite échelle en tubes fermés peuvent être requises. Les plages de mesure peuvent varier en fonction du type de méthode à petite échelle en tubes fermés des différents fabricants. Il appartient à l’utilisateur de choisir l’essai en tubes fermés à petite échelle avec la plage d’application appropriée ou d’adapter les échantillons dont les concentrations dépassent la plage de mesure d’un essai par dilution préliminaire. NOTE 1        Les résultats d’un essai en tube fermé sont plus précis au milieu de la plage d’application de l’essai. Les méthodes des fabricants pour les tubes fermés à petite échelle sont basées sur la réaction colorimétrique au diméthylphénol dépendant du mode opératoire type du tube fermé à petite échelle utilisé, voir l’Article 9. NOTE 2        Les lois, réglementations ou normes peuvent exiger que les données soient exprimées en NO3- après conversion avec le facteur de conversion stœchiométrique 4,426 81 de l’Article 11. NOTE 3        Dans le langage habituel du traitement des eaux usées et sur les écrans des photomètres ou des spectrophotomètres à essai en tube fermé automatisés, le NO3 sans indication de la charge négative est devenu la notation courante pour le paramètre nitrate et en particulier pour le paramètre nitrate-N. Cette notation est adoptée dans le présent document, même si la nomenclature chimique n’est pas tout à fait correcte.

Dieses Dokument legt ein Verfahren zur Bestimmung von Nitrat in Form von NO3-N in Wasser unterschiedlichen Ursprungs wie natürliches Wasser (einschließlich Grundwasser, Oberflächenwasser und Badewasser), Trinkwasser und Abwasser in einem Konzentrationsbereich zwischen 0,10 mg/l und 225 mg/l NO3-N durch Anwendung des Küvettentests fest. Bei Küvettentests können unterschiedliche Messbereiche erforderlich sein. Die Messbereiche können abhängig von der Art des Küvettentests verschiedener Hersteller unterschiedlich sein. Es liegt in der Verantwortung des Anwenders, den Küvettentest mit dem geeigneten Anwendungsbereich zu wählen oder Proben, deren Konzentrationen den Messbereich eines Tests überschreiten, durch vorheriges Verdünnen entsprechend anzupassen. ANMERKUNG 1 Die Messgenauigkeit der mit dem Küvettentest erhaltenen Ergebnisse ist in der Mitte des Anwendungsbereichs des Tests am größten. Die Küvettentests der Hersteller beruhen auf der Dimethylphenol-Farbreaktion, die vom typischen Betriebsverfahren für die verwendete Küvette abhängt, siehe Abschnitt 9. ANMERKUNG 2 Gesetze, Verordnungen oder Normen können fordern, dass die Daten nach Umrechnung mit dem in Abschnitt 11 angegebenen stöchiometrischen Umrechnungsfaktor 4,426 81 als NO3- angegeben werden. ANMERKUNG 3 Im Sprachgebrauch der Abwasseraufbereitung und auf den Anzeigen automatisierter Küvettentestgeräte ist NO3 ohne Angabe der negativen Ladung zur üblichen Darstellung für den Parameter Nitrat, und insbesondere für den Parameter Nitrat-N, geworden. Diese Darstellung ist in diesem Dokument übernommen worden, auch wenn sie nicht ganz der korrekten chemischen Nomenklatur entspricht.
ICS: 13.060.50-Examination of water for chemical substances
CTN: CEN/TC 230 - 6211

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