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This article in JEQ

  1. Vol. 32 No. 4, p. 1244-1249
     
    Received: July 8, 2002
    Published: July, 2003


    * Corresponding author(s): David.B.Ringelberg@erdc.usace.army.mil
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doi:10.2134/jeq2003.1244

RDX Loss in a Surface Soil under Saturated and Well Drained Conditions

  1. D. B. Ringelberg *,
  2. C. M. Reynolds,
  3. M. E. Walsh and
  4. T. F. Jenkins
  1. U.S. Army ERDC-CRREL, 72 Lyme Rd., Hanover, NH 03755

Abstract

On military training ranges, low-order, incomplete detonations deposit RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) into surface soils. In this study, we evaluated RDX biodegradation in surface soils obtained from a military training range in Alaska. Two factors were compared: (i) soil water potential during the incubations; and (ii) the use of acetonitrile (ACN) as an RDX carrier to spike samples. Organic solvents have been used in laboratory studies to dissolve slightly water-soluble contaminants before addition to soil. We added ACN to obtain final soil ACN concentrations of 0 mg kg−1 (0%), 1000 mg kg−1 (0.1%) and 10 000 mg kg−1 (1%). We then compared RDX attenuation in the soil under saturated and unsaturated conditions. RDX fell below the limit of detection within 3 wk of study initiation under the saturated condition. A maximum degradation rate of 0.15 mg RDX L−1 d−1 was measured. Under the unsaturated condition, 42% of the original RDX was still present at study termination (5 wk). The addition of acetonitrile at 0.1 or 1.0% had no affect on RDX loss in the saturated soil. In the unsaturated soil, however, ACN at 1.0% inhibited RDX loss by as much as 25%. These findings indicate that soil water potential and carrier solvent concentrations can impact the rate and extent to which RDX is attenuated in a surface soil.

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Copyright © 2003. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.32:1244–1249.