Iron-mediated remediation of RDX-contaminated water and soil under controlled Eh/pH

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45 Scopus citations

Abstract

Soil and water contaminated with hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) is a serious environmental problem at several active and abandoned munitions production facilities. Zero-valent iron (Fe0) can effectively remediate RDX-contaminated soil and water. The objective of this study was to manipulate Eh and pH for enhanced Fe0-mediated destruction of RDX. This was accomplished by monitoring RDX destruction under controlled Eh-pH conditions (Eh: -300 to +150 mV; pH: 2-10). Decreasing Eh and pH increased RDX destruction in aqueous solution. Treating 20 mg of RDX L-1 (90 μM) under a static Eh of -150 mV and pH 7 with 20 g of Fe0 L-1 removed 95% of the RDX within 4 h; no RDX was detected after 8 h. Treating a soil slurry (20% solids; 510 mg RDX kg-1 soil) with 20 g of Fe0 L-1 at an Eh of -150 mV and pH 7 increased RDX destruction by 24% over the unbuffered control and resulted in 99% RDX destruction within 24 h. Adding 4.2 mM sodium sulfide (in lieu of a static Eh) under similar conditions resulted in 93% RDX loss within 24 h. Results indicated that lowering Eh and maintaining neutral pH during Fe0 treatment can increase RDX destruction in contaminated soil and water.

Original languageEnglish (US)
Pages (from-to)1488-1494
Number of pages7
JournalEnvironmental Science and Technology
Volume33
Issue number9
DOIs
StatePublished - May 1 1999

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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