ADSORPTION OF RIMSULFURON IN SELECTED SOILS AND ITS REMOVAL VIA ACTIVATED CARBON

摘要

In present investigation, Rimsulfuron has been adsorbed onto the selected soils possessing agricultural significance via batch equilibration experiments. Such an approach was adopted for comprehension of the adsorptive interactions between Rimsulfuron and soils as a function of selected soils'physicochemical parameters. Linear adsorption coefficient values varied from 3.07 to 20.5 μg mL_(-1). Due to distinct physicochemical properties favoring the adsorption of Rimsulfuron, highest K_d value was shown by soil sample three with highest organic matter of 1.4% and lowest pH of 7.05. The Gibbs free energy values were found negative ranging from -6.7 to -19 kJ mol_(-1) proposing physio-sorption and exothermic interaction with selected soils. Results have been statistically analyzed by one way analysis of variance (ANOVA) and the accuracy of fit has been calculated by plotting residual graphs in Minitab. Activated carbon has been utilized for environmental remediation of Rimsulfuron adsorbed soils in simulated conditions. The effect of contact time on the removal efficiency was investigated. Soil sample 2 expressed the highest removal percentages by activated carbon at both concentrations of 5 ppm (81%) and 7.5 ppm (69%).