This standard BS EN 13342:2000 Characterization of sludges. Determination of Kjeldahl nitrogen is classified in these ICS categories:
13.030.20 Liquid wastes. Sludge
This method describes a procedure for the determination of "Kjeldahl Nitrogen" in sludge and sludge products. The digestion is catalysed by selenium or copper, the temperature being raised by a high concentration of sodium sulphate. Although wet samples are normally taken for analysis, it is recognised practice to report results on a dry mass basis (g/kg). Consequently, it is also necessary to determine the dry residue of the homogenised sample used for analysis (see EN 12880).
