DIN EN 16169:2012-11

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 is usually 0,03 % nitrogen, and the limit of quantification is 0,1 % nitrogen (using 0,25 mol/l sulfuric acid for titration). The preparation of this document by CEN is based on a mandate by the European Commission (Mandate M/330), which assigned the development of standards on sampling and analytical methods for hygienic and biological parameters as well as inorganic and organic determinants, aiming to make these standards applicable to sludge, treated biowaste and soil as far as this is technically feasible. This document (EN 16169:2012) has been prepared by Technical Committee CEN/TC 400 "Project Committee - Horizontal Standards in the fields of sludge, biowaste and soil", the secretariat of which is held by DIN. The responsible German committee is NA 119-01-02-02 UA "Chemische und physikalische Verfahren" ("Chemical and physical processes") of NA 119-01-02 AA "Abfall- und Bodenuntersuchung" ("Examination of waste and soil") at the Water Practice Standards Committee (NAW).