CAS RN:118-96-7

Soil Adsorption / Mobility

Kp values for 2,4,6-trinitrotoluene sorption on 4 aquatic sediments measured 5.5, 14.3, 16.5 and 22.2 after 24-hr equilibration time, suggesting that the sorption of 2,4,6-trinitrotoluene is low(1). However most of the material absorbed is strongly bound and desorption from sediment is slow(1). Furthermore sorption of 2,4,6-trinitrotoluene increases with increases in pH and temperature(1). Transformation products of 2,4,6-trinitrotoluene may absorb to sediments with the same intensity as 2,4,6-trinitrotoluene(1). Kp values of 5 sediments averaged 53 with a range between 35 and 84(2). According to a classification scheme(3), the corresponding Koc values, which range between 1,100 and 1,900 and average 1,600(2), suggest that 2,4,6-trinitrotoluene is expected to have low mobility in soil. A Kd value of 3.3 L/kg was given for soil from Nebraska Ordinance Plant(4). An average Kd value of 4.0 was determined in 14 different soils(5). Mobility of 2,4,6-trinitrotoluene was enhanced with strong hydrated(Na+, Ca+) or diminished with weakly hydrated (K+) cations(6). 2,4,6-Trinitrotoluenes affinity for phyllosilicates (Kl = 0.496 L/umol) may displace other nitroaromatic compounds effecting its transport through the soil(7). Sorption coefficients for 2,4,6-trinitrotoluene were given in topsoil samples as 6.38 L/kg and in illite as 223.63 L/kg(8). Desorption coefficients for 2,4,6-trinitrotoluene were given for topsoil as 12.01 L/kg and 265.98 L/kg in illite(8). Soil (pH 6.5, 5.3% clay, 1.7% organic matter) containing 11 mg/kg dry soil weight of 2,4,6-trinitrobenzene gave a Kd of 2.9 L/kg and average diffusion rate of 1.18X10-6 cu cm/sec, indicating slow transportation of 2,4,6-trinitrotoluene through the soil(9).
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