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吸附在氧化铁表面上的磷酸根包括同位素可交换性的和非交换性的二种类型。当磷酸根的吸附量低时,非交换性磷酸根与磷酸根的吸附量之比大于磷酸根的吸附量,高时二者之比非交换性磷酸根的量不受平衡悬浮液中磷酸根的浓度的影响。当磷酸根先被吸附,或磷酸根和氟离子同时吸附时,磷酸根的吸附不受氟离子的影响。当氟离子先被吸附时,它对磷酸根的吸附有一定的影响。当氟离子的吸附量低时,大部分被吸附的氟不能被磷酸根取代。随着氟的吸附量的增加,可被取代的氟离子的比例增大。
Phosphate groups adsorbed on the surface of iron oxide include both isotope exchangeable and non-exchangeable. When the amount of phosphate adsorbed is low, the ratio of non-exchangeable phosphate to phosphate is greater than the amount of phosphate adsorbed, and the high ratio of non-exchangeable phosphate is not affected by the equilibrium phosphate in the suspension The effect of concentration. When phosphate is adsorbed first, or both phosphate and fluoride are simultaneously adsorbed, phosphate adsorption is unaffected by fluoride. When the fluoride ion is adsorbed first, it has some influence on the phosphate adsorption. When the amount of fluoride ion adsorbed is low, most of the adsorbed fluorine can not be substituted by phosphate. As the amount of fluorine adsorbed increases, the proportion of fluorine ions that can be substituted increases.