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CEN

EN 25663:1993

(Main)

Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium (ISO 5663:1984)

Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium (ISO 5663:1984)

Specifies a procedure for the determination of trivalent negative nitrogen. Organic nitrogen in the form of azide, azine, azo, hydrazone, nitrite, nitro, nitroso, oxime or semicarbazone is not determined quantitatively. The procedure is applicable to the analysis of raw, potable and waste waters.

Wasserbeschaffenheit - Bestimmung von Kjeldahl-Stickstoff - Verfahren nach Aufschluß mit Selen (ISO 5663:1984)

Qualité de l'eau - Dosage de l'azote Kjeldahl - Méthode après minéralisation au sélénium (ISO 5663:1984)

1.1 Substance dosée La présente Norme internationale spécifie une méthode de dosage de l'azote par une méthode de type Kjeldahl. Seul l'azote à l'état trivalent négatif est dosé. L'azote organique du type azide, azine, azoïque, hydrazone, nitrite, nitré, nitrosé, oxime ou semicarbazone n'est pas dosé quantitativement. L'azote des composés hétérocycles peut être incomplètement récupéré. 1.2 Type d'échantillon La présente méthode est applicable aux eaux brutes, aux eaux potables et aux eaux résiduaires. 1.3 Étendue du dosage Une teneur en azote Kjeldahl, ρN jusqu'à 10 mg dans la prise d'essai peut être déterminée. Avec une prise d'essai de 10 ml, cela correspond à une concentration d'azote dans l'échantillon de ρN = 1 000 mg/l. 1.4 Limite de détection La limite de détection, déterminée expérimentalement (4 degrés de liberté), avec une prise d'essai de 100 ml est ρN = 1 mg/l. 1.5 Sensibilité Avec une

Kakovost vode - Določanje dušika po Kjeldahlu - Metoda po mineralizaciji s selenom (ISO 5663:1984)

General Information

Status
Published
Publication Date
29-Sep-1993
Withdrawal Date
30-Mar-1994
ICS
13.060.30 - Sewage water
Technical Committee
CEN/TC 230 - Water analysis
Drafting Committee
CEN/TC 230 - Water analysis
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
21-May-2008
Completion Date
21-May-2008
Ref Project
SIST EN 25663:1996 - Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium (ISO 5663:1984)

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserbeschaffenheit - Bestimmung von Kjeldahl-Stickstoff - Verfahren nach Aufschluß mit Selen (ISO 5663:1984)Qualité de l'eau - Dosage de l'azote Kjeldahl - Méthode apres minéralisation au sélénium (ISO 5663:1984)Water quality - Determination of Kjeldahl nitrogen - Method after mineralization wi
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