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Reanalysis of Boron Adsorption on Soils and Soil Minerals Using the Constant Capacitance Model

^a USDA-ARS, U.S. Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507 USA

View larger version (22K): [in a new window]   Fig. 1 Boron adsorption on Fe oxides: (a) hematite, suspension density , surface area ; (b) goethite, ; and (c) amorphous Fe oxide, . Squares represent experimental data. Model fits are represented by solid lines. Model predictions are represented by dashed lines. Initial B concentration = 0.463 mM

View larger version (25K): [in a new window]   Fig. 2 Boron adsorption on Al oxides: (a) Alon, surface density , surface area ; (b) Aluminium Oxid C, ; (c) pseudoboehmite, ; (d) amorphous Al oxide, SD = 5.2 g L-1, . Squares represent experimental data. Model fits are represented by solid lines. Model predictions are represented by dashed lines. Initial B concentration = 0.463 mM

View larger version (19K): [in a new window]   Fig. 3 Boron adsorption on kaolinites: (a) KGa-1 well crystallized kaolinite, ; (b) KGa-2 poorly crystallized kaolinite, ; (c) Georgia kaolinite, . Squares represent experimental data. Model fits are represented by solid lines. Model predictions are represented by dashed lines. Initial B concentration = 0.463 mM

View larger version (33K): [in a new window]   Fig. 4 Boron adsorption on 2:1 clays: (a) SAz-1 montmorillonite, ; (b) STx-1 montmorillonite, ; (c) SWy-1 montmorillonite, ; (d) IMt-1 illite, , (e) Fithian illite, ; (f) Morris illite, . Squares represent experimental data. Model fits are represented by solid lines. Model predictions are represented by dashed lines. Initial B concentration = 0.463 mM

View larger version (41K): [in a new window]   Fig. 5 Boron adsorption on soil samples: (a) Altamont soil, ; (b) Altamont subsoil, ; (c) Arlington soil, ; (d) Arlington subsoil, ; (e) Bonsall soil, ; (f) Bonsall subsoil, ; (g) Fallbrook soil, ; (h) Fallbrook subsoil, ; (i) Imperial soil, ; (j) Imperial subsoil, ; (k) Pachappa soil, ; (l) Pachappa subsoil, ; (m) Ramona soil, ; (n) Ramona subsoil, . Squares represent experimental data. Model fits are represented by solid lines. Model predictions are represented by dashed lines. Suspension density = 200 g L-1; initial B concentration = 0.463 mM

View larger version (17K): [in a new window]   Fig. 6 Distribution of B surface species for two soil samples: (a) Pachappa subsoil (filled symbols), (b) Altamont soil (open symbols). Circles represent the distribution of XOB(OH)2; squares represent the distribution of XOB-3

View larger version (22K): [in a new window]   Fig. 7 Boron adsorption on soil samples: (a) Hesperia soil, (b) Porterville soil, (c) Wasco soil, (d) Wyo soil. Squares represent experimental data. Model predictions are represented by solid lines. Initial B concentration = 0.463 mM