Journal article
Abiotic Transformation of Hexahydro-1,3,5-trinitro-1,3,5-triazine by FeII Bound to Magnetite
Environmental science & technology, Vol.38(5), pp.1408-1414
03/01/2004
DOI: 10.1021/es034588w
Abstract
RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), a nitramine explosive, is often found as a subsurface contaminant at military installations. Though biological transformations of RDX are often reported, abiotic studies in a defined medium are uncommon. The work reported here was initiated to investigate the transformation of RDX by ferrous iron (FeII) associated with a mineral surface. RDX is transformed by FeII in aqueous suspensions of magnetite (Fe3O4). Negligible transformation of RDX occurred when it was exposed to FeII or magnetite alone. The sequential nitroso reduction products (MNX, DNX, and TNX) were observed as intermediates. NH4 +, N2O, and HCHO were stable products of the transformation. Experiments with radiolabeled RDX indicate that 90% of the carbon end products remained in solution and that negligible mineralization occurred. Rates of RDX transformation measured for a range of initial FeII concentrations and solution pH values indicate that greater amounts of adsorbed FeII result in faster transformation rates. As pH increases, more FeII adsorbs and k obs increases. The degradation of RDX by FeII-magnetite suspensions indicates a possible remedial option that could be employed in natural and engineered environments where iron oxides are abundant and ferrous iron is present.
Details
- Title: Subtitle
- Abiotic Transformation of Hexahydro-1,3,5-trinitro-1,3,5-triazine by FeII Bound to Magnetite
- Creators
- Kelvin B GregoryPhilip Larese-CasanovaGene F ParkinMichelle M Scherer
- Resource Type
- Journal article
- Publication Details
- Environmental science & technology, Vol.38(5), pp.1408-1414
- Publisher
- American Chemical Society
- DOI
- 10.1021/es034588w
- ISSN
- 0013-936X
- eISSN
- 1520-5851
- Language
- English
- Date published
- 03/01/2004
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9983992077202771
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