Fig. 4. Boron sorption isotherms for Soil 3 at two temperatures. (a) untreated; (b) and (c) treated with 20 and 50 g Fly ash 
kg-1 soil, respectively.
Fig. 4. Boron sorption isotherms for Soil 3 at two temperatures. (a) untreated; (b) and (c) treated with 20 and 50 g Fly ash kg-1 soil, respectively.