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Solid-State Nitrogen-15 Nuclear Magnetic Resonance Analysis of Biologically Reduced 2,4,6-Trinitrotoluene in a Soil Slurry Remediation

^a Lehrstuhl für Bodenkunde, Technische Universität München, 85350 Freising-Weihenstephan, Germany
^b Fraunhofer-Institut für Grenzflächen-und Bioverfahrenstechnik, 70569 Stuttgart, Germany

View larger version (22K): [in a new window]   Fig. 1. Time course of the [14C] radioactivity during the biological anaerobic–aerobic treatment. The total radioactivity was calculated by the sum of radioactivity of all fractions

View larger version (25K): [in a new window]   Fig. 2. Solid-state 15N nuclear magnetic resonance (NMR) spectra of a TNT-contaminated soil before (P0) and after (P1) addition of [15N]-TNT

View larger version (25K): [in a new window]   Fig. 3. Solid-state 15N nuclear magnetic resonance (NMR) spectra of a [15N]- and [14C]-TNT spiked soil incubated for 4 d under anaerobic conditions. Sample P2a represents the bulk sample, P2b its residue after methanol extraction. Samples P2a-HF and P2b-HF are the residues of P2a and P2b after extraction with 10% hydrofluoric acid

View larger version (18K): [in a new window]   Fig. 4. Solid-state 15N nuclear magnetic resonance (NMR) spectra of hydrofluoric acid (HF)-treated [15N]- and [14C]-TNT spiked soils after 51 d of anaerobic incubation (P3) and after termination of the subsequent aerobic phase (total: 83 d of incubation) (P4)