The adsorption/desorption characteristics of [test material] was studied in a (a) (texture) soil(s) [pH --, organic carbon -- %] from [Country] in a batch equilibrium experiment. The experiment was conducted in accordance with the (specify the Guideline followed), and in compliance with the GLP standard (specify the GLP standard(s) followed e.g., OECD-GLP). The adsorption phase of the study was carried out by equilibrating air-dried/fresh soil with [test material] at 0, x1, c2, --, and Xn mg a.i./kg soil in dark at -- ēC for hr. The equilibrating solution used was 0.01 M CaCl2/other, with a soil/solution ratio of --. Desorption phase of the study was carried out by [Describe the desorption method including the number of desorption cycles used].
The supernatant solution after adsorption and desorption was separated by centrifugation/other and, extracted with (specify the solvent and/or method used; indicate if the supernatant was not extracted), and the [test material] residues were analysed by [TLC/HPLC (detector)/GC-(detector)]. [Indicate whether 14C in the soil residue after the adsorption and desorption steps was determined by combustion]. The adsorption parameters were calculated using the Freudlich adsorption isotherm.
[Indicate the stability of [test material] during the adsorption/desorption phase of the experiment]. The mass balance at the end of adsorption phase of the study was and -- % of the applied in soil 1 and soil 2, respectively. The mass balance at the end of desorption phase was and -- % of the applied in soil 1 and soil 2, respectively.
After hr of equilibration, and and -- % of the applied [test material] was adsorbed in soil 1 and soil 2, respectively. The adsorption Kd or K values were and in soil 1 and soil 2, respectively. The adsorption Koc values ranged from to --. At the end of the desorption, -- and -- % of the adsorbed amount was desorbed in soil 1 and soil 2, respectively. The desorption Kd or K values were -- and , in soil 1 and soil 2, respectively. Kd or K and Koc values were higher/similar/lower than those obtained for adsorption.
Amount adsorbed: as % of the applied (range)
Amount desorbed: as % of the adsorbed (range)
Study Acceptability: This study is classified [acceptable/unacceptable/supplemental] and satisfies/does not satisfy the guideline requirement for an adsorption/desorption study in soil.