Open AccessEffect of Cosolvent (Acetone) on the Adsorption and Movement of Cypermethrin in Indian Soils
Author(s) -
R. P. Singh,
D. P. Singh
Publication year - 1997
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361749701500207
Subject(s) - adsorption , loam , chemistry , freundlich equation , cypermethrin , soil water , aqueous solution , acetone , langmuir , analytical chemistry (journal) , chromatography , pesticide , organic chemistry , soil science , geology , agronomy , biology
The adsorption and movement of cypermethrin in different types of uncontaminated soils in acetone-water mixtures at different f s values has been studied by batch shake and soil thin-layer chromatographic techniques, respectively. Higher adsorption and a reduced movement of cypermethrin was observed on silt clay loam soil followed by loam and sandy loam soils and was anticipated by the Freundlich adsorption constants K m and R f values. The K m and R f values also confirmed that the adsorption of cypermethrin decreased while its movement increased with increasing f s values. The values of the Freundlich constant K m were used to evaluate the cosolvent theory for describing the adsorption of cypermethrin in acetone–water mixtures. For each soil, the values of the adsorption coefficient K m decreased in a linear logarithmic fashion as f s increased, the slopes of the log K m versus f s plots being essentially the same for all soils. Thus, the cosolvent effects on adsorption could be expressed by a single parameter (σ s ) which combines the characteristics of the solvent (acetone) and the adsorbate (cypermethrin). For adsorbates with a low solubility in aqueous solutions, the adsorption data from mixed solvents was extrapolated to f s = 0 to estimate the values of the adsorption constant K w in the aqueous phase.