Phytate exudation by the roots of Pteris vittata can dissolve colloidal FePO.

Phosphorus (P) is limiting nutrient in many soils, and P availability may often depend on iron (Fe) speciation. Colloidal iron phosphate (FePO) is potentially present in soils, and we tested the hypothesis that phytate exudation by Pteris vittata might dissolve FePO by growing the plant in nutrient solution to which FePO was added. The omission of P and Fe increased phytate exudation by P.

Synthesis of a novel Fe-Mn binary oxide-modified lava adsorbent and its effect on ammonium removal from aqueous solutions.

Ammonium is strongly related to eutrophication and a key control of eutrophication in aquatic systems, especially in agricultural runoff. In this study, a novel Fe-Mn binary oxide-modified lava (FMML) granular adsorbent was synthesized for ammonium removal from aqueous solutions by co-precipitation method. The kinetic data were described by pseudo-second-order kinetic model well and intraparticle diffusion had effects on ammonium adsorption.