C. Cabbar et al., ANALYSIS OF DIFFUSION AND SORPTION OF CHLORINATED HYDROCARBONS IN SOIL BY SINGLE-PELLET MOMENT TECHNIQUE, Environmental science & technology, 28(7), 1994, pp. 1312-1319
The single-pellet moment technique was shown to be a powerful method f
or investigating the diffusion and adsorption of volatile hydrocarbons
in the soil. The technique was used to evaluate effective diffusiviti
es, adsorption equilibrium, and rate constants of chlorinated hydrocar
bons (monochloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, and
1,1,2-trichloroethane). Results obtained in a dry system showed that
adsorption rate constants of all these hydrocarbons on the soil pellet
used are of the same order of magnitude (4.4-8.0 cm3 g-1 s-1). On the
other hand, molecules having chlorine atoms bonded to the same carbon
atom (monochloroethane, 1,1,1-trichloroethane) have adsorption equili
brium constants about 1 order of magnitude smaller than these for mole
cules containing chlorine atoms bonded to different carbon atoms (1,1,
2-trichloroethane, 1,2-dichloroethane).