Fig. 1. Sorbed concentration of 2,4,6-trinitrotoluene (TNT) in monopotassium phosphate (MKP)-amended soil according to sorption period. Initially applied concentration of TNT = 10 mg/kg.
Fig. 2. Leachable concentration of 2,4,6-trinitrotoluene (TNT) inmonopotassium phosphate (MKP)-amended soil according toincubation period. Initially applied concentration of TNT = 160mg/kg, corresponding to leachable concentration of 8 mg/L.
Fig. 3. Log-transformed Freundlich sorption isotherm plotted as log-transformed sorbed 2,4,6-trinitrotoluene (TNT) concentration (q) vs dissolved phase (Cw) of TNT at sorption equilibrium.
Fig. 4. Desorbed fraction (desorbed concentration/sorbed concentration (q)) of 2,4,6-trinitrotoluene (TNT) from soil with different amendment conditions with respect to desorption time. (a) Soil only (no amendment), (b) Monopotassium phosphate (MKP, 5% of soil mass)-amended soil, (c) MKP- and montmorillonite (5% of soil mass for each)-amended soil, (d) MKP- and montmorillonite (5% and 10% of soil mass, respectively)-amended soil, (e) MKP- and montmorillonite (5% and 15% of soil mass, respectively)-amended soil.
Fig. 5. Freundlich sorption and desorption isotherms of 2,4,6-trinitrotoluene (TNT) for soils with different treatments. Cw and q refers to the TNT concentration in aqueous phase and sorbed phase at sorption equilibrium, respectively. (a) Untreated soil. (b) Potassium phosphate monobasic (MKP)-treated soil. (c) MKP- and bentonite (5% of soil mass)-treated soil. (d) MKP- and bentonite (10% of soil mass)-treated soil. (e) MKP- and bentonite (15% of soil mass)-treated soil.
Fig. 6. Extractable fraction of 2,4,6-trinitrotoluene (TNT) determined by synthetic precipitation leaching procedure (SPLP) or HPCD extraction in soils with different amendment conditions.
Table 1. Physicochemical properties of the soil used in this study
Table 2. Sorbed and desorbed concentration of 2,4,6-trinitrotoluene (TNT) in the presence of MKP and/or montmorillonite
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