Incorporation of 14C-Labeled 2,4,6-Trinitrotoluene Metabolites into Different Soil Fractions after Anaerobic and Anaerobic-Aerobic Treatment of Soil/Molasses Mixtures
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- 作者：Oliver Drzyzga ; Dirk Bruns-Nagel ; Thomas Gorontzy ; Karl-Heinz Blotevogel ; Diethard Gemsa ; and Eberhard von Lö ; w
- 刊名：Environmental Science & Technology
- 出版年：1998
- 出版时间：November 15, 1998
- 年：1998
- 卷：32
- 期：22
- 页码：3529 - 3535
- 全文大小：99K
- 年卷期：v.32,no.22(November 15, 1998)
- ISSN：1520-5851
文摘
Experiments were conducted to evaluate the level ofincorporation of 14C-labeled 2,4,6-trinitrotoluene (TNT) andmetabolites into the organic soil matrix of anaerobicand sequential anaerobic-aerobic treated soil/molassesmixtures. After 9 weeks of anaerobic-aerobic incubationwith an optimized experimental setup, we determinednearly 84% of the initially applied radioactivity immobilizedin different soil fractions, whereas only 57% of theradioactivity was measured as immobilized in the soilorganic matrix at the end of the anaerobic treatment (after5 weeks). After alkaline hydrolyses of the solvent-extracted soil/molasses mixtures, small amounts ofradioactivity were found in the humic acid and fulvic acidfraction, whereas the major part of radiolabel wasfound to be strongly bound to the humin fraction. Inagreement with these findings, the amount of extractableradioactivity (water, methanol, and ethyl acetate extractions)decreased from 40% after the anaerobic phase to nearly 9%after the aerobic treatment phase. The transformationof TNT at the end of the experiments was above 95% and97% after anaerobic and sequential anaerobic-aerobictreatment, respectively. We propose a two-step treatmentprocess (anaerobic-aerobic bioremediation process)with some special procedures during the anaerobic andthe aerobic treatment phases as the most promising methodfor effective, economic, and ecologically acceptabledisposal of TNT from contaminated soils by means ofimmobilization (for example, humification) of this xenobiotic.