Novel polymeric sensor for ultra-trace determination of cerium (III) based on CoNiFe2O4 nanocomposite

The current study reports a successful cation-selective electrode based on CoNiFe2O4 magnetic nanocomposite to determine the Ce3+ ion. The results revealed this new nanocomposite can be applied as an excellent modifier in lieu of common organic modifiers that are used in the construction of ion-selective electrodes. The replacement of nanocomposite can significantly boost the performance of the electrode compared with organic modifiers. Under optimal conditions, the sensor exhibited a Nernstian slope of roughly 17.5 mV per decade in the linear range of 1.0 x 10(-8)-1.0 x 10(-1) mol/L. Also, the detection limit was 7.0 x 10(-9) mol/L. This electrochemical sensor showed a stable potential in 5 s. The optimum pH for electrode operation is in the range of 2-10. Among various interferences ions, this electrochemical sensor manifested high selectivity toward Ce3+ cation. The obtained results in analytical applications demonstrated the excellent ability of this electrode to determine Ce3+ cation via titration with ethylene diamine tetra acetic acid. Moreover, this indicator electrode was used for the measurement of Ce3+ cations in various samples. [GRAPHICS] .