鉄の酸化, 水酸化, 吸着過程からみた底質からのリンの溶出機構

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  • Mechanism of Phosphate Release from Sediments Seen from Processes of Oxygenation, Hydroxylation and Adsorption of Iron

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A model of the mechanism of phosphate release from lake sediments was proposed and its validity was examined experimentally.<BR>The complex process of phosphate release from sediments was assumed to be composed of three elementary processes : oxygenation of Fe(II) to Fe(III), formation of ferric hydroxides and adsorption of phosphate to ferric hydroxides. The model was examined experimentally by studying the transient behaviors of ferrous iron, ferric iron and phosphate concentrations and that of redox potential. The experimental results agreed with the calculated results assuming the oxygenation kinetics of Fe(II), the solubility product of ferric hydroxides and the adsorption ratio of phosphate to ferric hydroxides.<BR>It suggests that the mechanism of phosphate release from sediments can be quantitatively described by our model. The difference of phosphate release rate under aerobic and anaerobic conditions can be also explained by our model considering the dependence of oxygenation rate of Fe(II) on DO.

収録刊行物

  • 水質汚濁研究

    水質汚濁研究 14 (4), 253-260,232, 1991

    公益社団法人 日本水環境学会

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