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Fig. 6. Comparison of adsorption isotherms of (A) 2,4-D and those of (B) phosphate on untreated UG5 soil. (A) The amount of soil, 50 g L–1 (oven-dry basis); background electrolyte, 0.01 M CaCl2; reaction time, 4 h. First, a relationship between 2,4-D adsorption and equilibrium pH was drawn at each initial 2,4-D concentration (6 to 7 plots between pH 3.5 and 7.5), and then 2,4-D adsorption at pH 4.0, 5.0, 6.0, and 7.0 at each initial 2,4-D concentration was read from the relationship and plotted on this figure. (B) The amounts of phosphate adsorption on untreated UG5 soil were calculated based on Hiradate and Uchida (2004).
