Highly sensitive determination of nitrite using a carbon ionic liquid electrode modified with Fe3O4 magnetic nanoparticle

A carbon ionic liquid electrode modified with Fe 3 O 4 magnetic nanoparticle (Fe 3 O 4 NPs/CILE) was employed for nitrite determination by cyclic voltammetry. The results showed that the Fe 3 O 4 NPs/CILE exhibited a significant improvement in the oxidation peak current of nitrite. After optimizing the operational conditions, a linear response range from 10 to 900 µmol L −1 with a low detection limit of 0.70 µmol L −1 was obtained. The proposed sensor was stable with a sensitivity of 0.0402 μA μmol −1 L and good repeatability evaluated in terms of relative standard deviation (RSD