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Alkaline Fly Ash Effects on Boron Sorption and Desorption in Soils

Laboratory of Soil Science, Faculty of Agriculture, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece

View larger version (20K): [in a new window]   Fig. 1. Freundlich isotherm, x = kCn, for (a) B sorption on the untreated soils and those (b) treated with 20 g Fly ash I kg-1 soil.

View larger version (19K): [in a new window]   Fig. 2. Langmuir isotherm, x = KMC/(1 + KC), for (a) B sorption on the untreated soils and (b) those treated with 20 g Fly ash I kg-1 soil.

View larger version (15K): [in a new window]   Fig. 3. Boron sorption on the three soils as a function of B concentration in solution and pH (Solid lines predict sorption according to Eq. [3]; open symbols are the observe sorption). Sorption data for all treatments of each soil were used for fitting the Keren et al. (1981) equation.

View larger version (13K): [in a new window]   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.

View larger version (12K): [in a new window]   Fig. 5. Cumulative amounts of desorbed B from treated and untreated soils, after addition of 25 mg B kg-1 soil and 30 d equilibration. Each step represents a 24-h desorption interval.