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Published online 7 November 2005
Published in J Environ Qual 34:2208-2216 (2005)
DOI: 10.2134/jeq2005.0032
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Biotic and Abiotic Degradation of CL-20 and RDX in Soils

Fiona H. Crockera,*, Karen T. Thompsonb, James E. Szecsodyc and Herbert L. Fredricksonb

a Analytical Services, Inc., 3532 Manor Dr., Suite 3, Vicksburg, MS 39180
b U.S. Army Engineer Res. and Dev. Center, CEERD-EP, 3909 Halls Ferry Rd., Vicksburg, MS 39180
c Pacific Northwest National Lab., P.O. Box 999 K3-61, Richland, WA 99354



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  		Fig. 1. Molecular structures of hexanitrohexaazaisowurtzitane (CL-20) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX).

 


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  		Fig. 2. Degradation of hexanitrohexaazaisowurtzitane (CL-20; 10 mg L–1) in China Lake soil microcosms incubated under aerobic conditions. (A) Surface soil; (B) subsurface soil. Symbols: unamended soil, open circles; soil + glucose, solid triangles; soil + glucose + HgCl2, open triangles; mineral salts medium + glucose, solid squares.

 


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  		Fig. 3. Degradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX; 10 mg L–1) in China Lake soil microcosms incubated under aerobic conditions. (A) Surface soil; (B) subsurface soil. Symbols: unamended soil, open circles; soil + glucose, solid triangles; soil + glucose + HgCl2, open triangles; mineral salts medium + glucose, solid squares.

 


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  		Fig. 4. Cumulative mineralization of 14C-hexanitrohexaazaisowurtzitane (14C-CL-20; 3.5 mg L–1, 1.44 µCi L–1) to 14CO2 in China Lake soil microcosms. (A) Surface soil; (B) subsurface soil. Symbols: unamended soil, open circles; soil + glucose, solid triangles; soil + glucose + HgCl2, open triangles; mineral salts medium + glucose, solid squares.

 


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  		Fig. 5. Change in CL-20 concentration in China Lake soil microcosms amended with 14C-hexanitrohexaazaisowurtzitane (14C–CL-20; 3.5 mg L–1, 1.44 µCi L–1). (A) Surface soil; (B) subsurface soil. Symbols: unamended soil, open circles; soil + glucose, solid triangles; soil + glucose + HgCl2, open triangles; mineral salts medium + glucose, solid squares.

 




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