Characterization and Remediation of Soil Contaminated with Explosives: Development of Practical Technologies

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Authors
  1. Hawari, J.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);National Research Council, Montreal QUE (CAN) Biotechnology Research Inst
Abstract
The sorption-desorption behavior and long-term fate of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) was examined in sterilized and nonsterilized topsoil. Results of this study indicate that although RDX is not extensively sorbed by the topsoil (ksd of 0.83 L/kg), sorption is nearly irreversible. Furthermore, there was no difference in the sorption behavior for sterile and nonsterile topsoil. However, over the long-term, RDX completely disappeared within 5 weeks in nonsterile topsoil, and hexahydro-1-nitroso-3,5-dinitro-1,3,5-triazine (MNX), hexahydro-1,3-dinitroso-5-nitro-1,3,5-triazine (DNX), and hexahydro-1l3l5-trinitroso-1,3,5-triazine (TNX) metabolites formed in the aqueous phase. Over the same period, recovery of RDX from sterile topsoil was high (55-99%), and the nitroso metabolites were not detected. Only traces of RDX were mineralized to CO2 and N2O by the indigenous microorganisms in nonsterile topsoil. Of the RDX that was mineralized to N2O, one N originated from the ring and the other from the nitro group substituent, as determined using N15 ring-labeled RDX. However, N2O from RDX represented only 3% of the total N2O that formed from the process of nitrification/denitrification.
Report Number
DRDC-VALCARTIER-CR-2005-053;NRCC/BRI-44597 — Contractor Report
Date of publication
06 Jul 2001
Number of Pages
102
DSTKIM No
CA025682
CANDIS No
523385
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