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Published online 20 May 2009
Published in J Environ Qual 38:1458-1465 (2009)
DOI: 10.2134/jeq2008.0183
© 2009 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Sorption of High Explosives to Water-Dispersible Clay: Influence of Organic Carbon, Aluminosilicate Clay, and Extractable Iron

Katerina M. Dontsovaa,c,*, Charolett Hayesa, Judith C. Penningtonb and Beth Portera

a SpecPro, Inc., U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180
b Environmental Processes Branch, Environmental Lab., U.S. Army Engineer Research and Development Center, Vicksburg, MS. SpecPro, Inc., 3530 Manor Drive, Suite 4, Vicksburg, Mississippi 39180
c current address, Biosphere 2, Univ. of Arizona, Tucson, AZ 85721-0158


Figure 1
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  		Fig. 1. Flow chart of water-dispersible clay (WDC) treatments. All WDC samples were treated with sodium acetate buffer to remove carbonates. OC = organic carbon, Fed = dithionite-citrate extractable iron, Feo = acid oxalate extractable iron.

 

Figure 2
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  		Fig. 2. TNT and RDX recovery in Catlin water-dispersible clay (WDC) over time. Each point is average of two replications. Error bars equal one standard deviation

 

Figure 3
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  		Fig. 3. Adsorption isotherms for RDX in Kenner water-dispersible clay (WDC). Data points for both replicates are shown.

 

Figure 4
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  		Fig. 4. Adsorption isotherms for TNT in Catlin water-dispersible clay (WDC). Data points for both replicates are shown.

 

Figure 5
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  		Fig. 5. Linear adsorption coefficients normalized to fraction of OC (KOC) for TNT and RDX adsorption by untreated and treated water-dispersible clay (WDC). Treatments indicated by numbers are: 1 = WDC, 2 = WDC-OC, 3 = WDC-OC-Fed, 4 = WDC-OC-Feo, 5 = WDC-Feo. Error bars are 95% confidence intervals around the mean.

 




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