1.        
   

The following data were obtained to determine the phosphate sorption characteristics of a lake sediment. Solutions were buffered to maintain pH 7.0 and I=0.01. The total amount of sediment in each flask was 1.25 g (dry wt.), and the solution volume was 100 mL. Pieq is the amount of dissolved phosphate-P remaining in solution after equilibration with the sediment. Piinit is the initial amount of dissolved phosphate in the solution. Pi,init (g/L) 60 100 Pi.cq (g/L) 40 65 Determine whether the data fit the Langmuir and Freundlich isotherms and compute the sorption equation parameters. Which model would you select to portray the sorption results, and explain briefly why you chose this model? 125 90 240 195 450 388 850 765