but
amounted
to 213.5 mg l1 in the leachate of
material II (day 85). It is characterized by a broad band at 1400–
1340 cm1 and a shoulder at 1400 cm1. The comparatively high
and sharp peak at 1360 cm1 in the leachate of material II (day
41) seems to be induced by NO2 stretch vibrations of nitrite, an
intermediate product during oxidation of ammonium to nitrate