Detection of Selenium and Nickel Metal Ion in Water Using Mn 3 O 4 ‐Cn‐Modified Electrode

The present study reports the design of the Mn 3 O 4 ‐Cn electrode and its use for simultaneous detection of selenium and nickel in water. The designed electrode can be used as a convenient electrochemical device for on‐site testing of Se (IV) and Ni (II) levels in affected regions. The best responses are obtained with 0.1 M phosphate buffer saline (PBS) and 5 mM Fe (CN) 6 as supporting electrolyte. The scan rate and the number of cyclic repetitions have a great effect on peak shape and intensity. It is seen from our study that peak intensity is directly proportional to Se (IV) and Ni (II) concentrations in the range of 5 to 250 µ g/L (correlation coefficients 0.952 and 0.984) when the optimized parameters are used. The detection limit of 0.533 µ g/L Se (IV) and 0.718 µ g/L for Ni (VI) with a response time of 18 s for 5–250 µ g/L concentration is obtained, respectively. Enhanced analytical results for different water samples establish that the proposed method is appropriate for Se (IV) and Ni (II) detection. FESEM images confirm the Mn 3 O 4 ‐Cn nanocomposite formation on the electrode.