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This article in JEQ

  1. Vol. 27 No. 5, p. 1240-1245
     
    Received: Aug 22, 1997
    Published: Sept, 1998


    * Corresponding author(s): scomfort@unl.edu
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doi:10.2134/jeq1998.00472425002700050032x

Remediating RDX-Contaminated Water and Soil Using Zero-Valent Iron

  1. J. Singh,
  2. S. D. Comfort * and
  3. P. J. Shea
  1. School of Natural Resource Sciences, Univ. of Nebraska, Lincoln, NE.

Abstract

Abstract

Soil and water contaminated with RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) pose a serious threat to the environment and human health. Our objective was to determine the potential for using zero-valent iron (Fe0) to remediate RDX-contaminated water and soil. Mixing an aqueous solution of 32 mg RDX L−1 (spiked with 14C-labeled RDX) with 10 g Fe0 L−1 resulted in complete RDX destruction within 72 h. Nitroso derivatives of RDX accounted for approximately 26% of the RDX transformed during the first 24 h; these intermediates disappeared within 96 h and the remaining 14C products were water soluble and not strongly sorbed by iron surfaces. When RDX-contaminated soil (30 mg RDX kg−1 spiked with 14C-RDX) was treated with a single amendment of Fe0 (20 g kg−1 soil) in a static soil microcosm, more than 60% of the initial 14C-RDX was recovered as 14CO2 after 112 d. Treating surface and subsurface soils containing 3600 mg RDX kg−1 with 50 g Fe0 kg−1 at a constant soil water content (0.35–0.40 kg H2O kg−1 soil) resulted in a 52% reduction in extractable RDX following 12 mo of static incubation. A second Fe0 addition at 12 mo further reduced the initial extractable RDX by 71% after 15 mo. These results support the use of zero-valent iron for in situ remediation of RDX-contaminated soil.

Paper no. 12001, Agric. Res. Div., Univ. of Nebraska-Lincoln, Lincoln, NE 68583-0758.

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