A novel magnetic CN framework material (FeO/CN) was developed as a high selectivity extractant for La(III) determination in food samples. The FeO/CN material was synthesized by thermal deammoniation method and has larger surface area (100.3 m g) and more effective adsorption sites compared with that of individual CN material (19.4 m g). It was proved that FeO/CN material displayed excellent selectivity and adsorption capacity for La(III). In addition, adsorption isotherm and kinetic data indicated that La(III) adsorption based on FeO/CN material is a monolayer adsorption which is compatible with Langmuir model and follows a pseudo-second-order kinetic equation. By using FeO/CN material as extractant, an analytical method was established with low limits of detection (3σ, n = 6) of 10.4 μg L, reasonable recoveries ranged from 86% to 106% and good precision with the RSD less than 10.7%. The analytical method was further applied to the determination of trace La(III) in food sample. It evinced that the concentration of La(III) in sea fish is 13.2 μg kg and the content of La is 0.138 μg kg, which is 1.03% of total La(III).
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