An isotherm analysis was performed on a surface soil and an aqueous solution of toluene. Six 1-L beakers were used, each containing 10g of soil and varying concentrations of toluene. After allowing the system to equilibrate for 24 hours, analysis of the aqueous phase showed the following results: 4. Initial Aqueous Toluene Concentration (mg/L) Aqueous Toluene Concentration after Sorption (mg/L) 215 112 180 87.6 140 48.5 114 4.8 86 2.5 48 1.8 Fit the data to Langmuir and Freundlich isotherms. Determine the empirical coefficients for the isotherm equation which best fits the data. Discuss your rationale for isotherm choice.

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