The fitting of experimental data to first-order reaction models will indicate the changing of desorption rate constants with respect to the different reaction periods.
The objective of this study is to examine the effect of length of adsorption period on the amount and subsequent desorption rates of Ag from some Fe oxides and soil organic matter.
After shaking for 4 days at 20[degrees]C, the samples were immediately used for desorption or allowed to stand in a 35[degrees]C constant temperature room for up to 4 months with periodic shaking.
Since tannery wastes generally contain elevated concentrations of Na, Ca, Cl, S, and P (UNEP and IEO 1991), we studied the effects of solution Ca and Na and the presence of phosphate and chloride on the desorption behaviour of Cr from contaminated surface and subsurface soil.
Because of the contrasting pH, surface (0-15 cm) and subsurface (50-90 cm) soils were selected for desorption experiments.
Initially batch desorption experiments were conducted on the surface (0-15 cm) and subsurface (50-90 cm) soils to assess the kinetics of Cr release, and to determine a suitable solution:soil ratio for detailed studies.
Desorption plots for 2 soil samples (TW21 and TW23) are presented in Fig.
Barrow NJ (1983) A mechanistic model for describing the sorption and desorption of phosphate by soil.
Kuo S, Lotse EG (1974) Kinetics of phosphate adsorption and desorption by lake sediments.
Desorption of native Cd from soils was determined by repeated equilibration of soil samples (5.
Subsampling for analysis was carried out immediately after this moisture addition and samples were subjected to desorption in the same manner as described above.
All sorption and desorption work was carried out in duplicate and all data presented represent means values of the duplicate determinations.