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Phosphate Sorption in Aluminum- and Iron-Rich Humus Soils

^a Dep. of Forest Ecology, Swedish Univ. of Agricultural Sciences, S-901 83 Umeå, Sweden, and Dep. of Ecology and Environmental Science, Umeå Univ., S-901 87 Umeå, Sweden
^b Dep. of Chemistry, Inorganic Chemistry, Umeå Univ., S-901 87 Umeå, Sweden

View larger version (15K): [in a new window]   Fig. 1. Adsorption isotherms for the two soils, (a) Betsele and (b) Flakastugan. The batch sorption experiments were performed in both deionized water (unfilled squares) and 0.1 mol dm–3 NaCl (crosses). The error bar denotes the maximum confidence interval for the Betsele (n = 3–5) and Flakastugan soil (n = 2). The total amount of sorbed phosphate, q, has been defined as the sum of the native amount of inorganic phosphate (2.9 and 7.2 mmol kg–1 for the Betsele and Flakastugan soil, respectively) and the sorbed inorganic phosphate.

View larger version (15K): [in a new window]   Fig. 2. The relationship between reaction time and phosphate sorption in deionized water.

View larger version (12K): [in a new window]   Fig. 3. The pH dependence of phosphate sorption. The amount of phosphate sorbed as a function of pH in solution for humus soils from (a) Betsele and (b) Flakastugan. The batch sorption experiments were performed in both self-medium (unfilled circles) and 0.1 mol dm–3 NaCl (filled circles).

View larger version (19K): [in a new window]   Fig. 4. Attenuated total reflectance Fourier transform infrared spectroscopy spectra of, from top to bottom, native Betsele soil, Betsele soil + 14 mmol dm–3 phosphate, Betsele soil + 28 mmol dm–3 phosphate, native Flakastugan soil, Flakastugan soil + 14 mmol dm–3 phosphate, and Flakastugan soil + 28 mmol dm–3 phosphate. All spectra are plotted on the same ordinate scale in absorbance units.

View larger version (16K): [in a new window]   Fig. 5. Difference attenuated total reflectance Fourier transform infrared spectroscopy spectra obtained by subtracting the spectrum of the corresponding native soil from the spectrum (a) Betsele soil + 14 mmol dm–3 phosphate, (b) Betsele soil + 28 mmol dm–3 phosphate, (c) Flakastugan soil + 14 mmol dm–3 phosphate, and (d) Flakastugan soil + 28 mmol dm–3 phosphate. All spectra are plotted on the same ordinate scale in absorbance units.

View larger version (25K): [in a new window]   Fig. 6. Phosphate sorption in relationship to (a, b) release of dissolved organic carbon (DOC), (c, d) conductivity, (e, f) release of Ca and Mg, and (g, h) release of Al. Filled and unfilled squares represent the Betsele humus soil and the Flakastugan soil, respectively.

View larger version (14K): [in a new window]   Fig. 7. The relationship from between (a) acid digestible Al + Fe and organic P (filled circles) and inorganic P (unfilled squares) and (b) the relationship between C content and organic P in humus soils from five groundwater discharge areas (Giesler et al., 2002) including both within-site and between-site variation.