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.

 


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

 


Fig. 3.

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

 


Fig. 4.

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

 


Fig. 5.

Linear adsorption coefficients normalized to fraction of OC (K OC) 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.