90.93 Standard confirmed Jul 11, 2024
CEN
CEN/TC 444 Environmental characterization of solid matrices
European Norm
13.030.01 Wastes in general | 13.080.10 Chemical characteristics of soils
This European Standard specifies the determination of Kjeldahl nitrogen according to the Kjeldahl procedure in sludge, treated biowaste and soil.
Nitrate and nitrite are not included.
Compounds with nitrogen bound in N-N, N-O linkages and some heterocycles (pyridines) are only partially determined.
The limit of detection (LOD) is usually 0,03 % nitrogen, and the limit of quantification (LOQ) is 0,1 % nitrogen (using 0,25 mol/l sulfuric acid for titration).
Legislation related to this standard
Protection of the environment, and in particular of the soil, when sewage sludge is used in agriculture
PUBLISHED
EN 16169:2012
90.93
Standard confirmed
Jul 11, 2024