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Norm
ÖNORM EN 25663
Issue date: 1993 12 01
Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium (ISO 5663:1984)
1.1 Substance determined
This International Standard specifies a rnethod for the determination
of nitrogen by a Kjeldahl-type method. Only trivalent
negative nitrogen ...
Valid
Publisher:
Austrian Standards International
Format:
Digital | 11 Pages
Language:
German
| English
| Download GER/ENG
Optionally co-design standards:
ICS
1.1 Substance determined
This International Standard specifies a rnethod for the determination
of nitrogen by a Kjeldahl-type method. Only trivalent
negative nitrogen is determined. Organic nitrogen in the form
of azide, azine, azo, hydrazone, nitrite, nitro, nitroso, oxime or
semicarbazone is not determined quantitatively. Nitrogen may
be incompletely recovered from heterocyclic nitrogen compounds.
1.2 Type of sample
This method is applicable to the analysis of raw, potable and
waste waters.
1.3 Range
A Kjeldahl nitrogen content, rho N, of up to 10 mg, in the test portion
may be determined. Using a 10 ml test portion, this corresponds
to a sample concentration of up to rho N = 1 000 mg/L
1.4 Limit of detection
A practically determined (4 degrees of freedom) limit of detection,
using a 100 ml test portion, is rho N = 1 mg/l.
1.5 Sensitivity
Using a 100 ml test portion, 1,0 ml of 0,02 mol/l hydrochloric
acid is equivalent to rho N = 2,8 mg/l.
ÖNORM EN 25663
1993 12 01
Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium (ISO ...
Norm
↖
ÖNORM M 6248
1988 06 01
Water quality; determination of Kjeldahl nitrogen; method after mineralization with selenium
Norm
Norm
Issue date :
1984 05 01
Water quality — Determination of ammonium — Part 1: Manual spectrometric method
Norm
Issue date :
1984 05 01
Water quality — Determination of ammonium — Part 1: Manual spectrometric method
Norm
Issue date :
1984 05 01
Water quality — Determination of Kjeldahl nitrogen — Method after mineralization with selenium