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Kinetics and Energetics of Phosphate Release from Tropical Soils Determined by Mixed Ion-Exchange Resins

^a Dep. of Soil Science, Faculty of Agriculture, Ahmadu Bello University, Zaria, Nigeria
^b Embrapa Meio Ambiente, Caixa Postal 69, 13820-000 Jaguariuna (SP), Brazil

View larger version (18K): [in a new window]   Fig. 1. The time-dependent phosphate sorption by mixed cation-anion exchange resins. (A = shaking and B = nonshaking.)

View larger version (22K): [in a new window]   Fig. 2. Phosphate-sorption kinetics by mixed cation-anion exchange resins as described by the parabolic model (A = shaking and B = nonshaking) where F is fractional equilibrium plotted as a function of the square root of time (h).

View larger version (18K): [in a new window]   Fig. 3. The influence of temperature on rate coefficients of P release from tropical soils determined by mixed cation-anion exchange resins as described Arrhenius equation.