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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.
