Fig. 3. Nitrogen-15-NMR spectra of (A) methanol extract from 2,4,6-¹⁵N-labeled TNT incubated for six days under anaerobic/aerobic conditions in the presence of anaerobic microorganisms and catechol (Sample VI) and (B) standard solution of 2,4,6-¹⁵N-TNT in MeOD. Upper scale referenced to NH₃, lower scale referenced to CH₃NO₂.