Macroporous Bismuth Film Screen‐Printed Carbon Electrode for Simultaneous Determination of Ni(II) and Co(II)

Abstract

AbstractMacroporous bismuth film screen‐printed carbon electrode (mpBiF‐SPCE) was used for simultaneous measurement of Ni(II) and Co(II) at their trace concentration level by means of adsorptive cathodic stripping voltammetry with dimethylglyoxime as a complexing agent. The mpBiF‐SPCE was prepared on a screen printed carbon electrode by colloidal crystal templating using aqueous suspension of polystyrene microspheres which were self‐assembled onto the electrode by slow evaporation of solvent. Following the electrochemical deposition of bismuth film, the microspheres were dissolved with toluene providing the macroporous bismuth film structure. The mpBiF‐SPCE offered good electroanalytical performance with estimated limits of detection of 27 and 94 ng L−1 for Ni(II) and Co(II), respectively, in combination with an accumulation time of 180 s, and relative standard deviations of 3.3 % for Ni(II) and 5.2 % for Co(II). The effect of potentially interfering ions and the surface‐active compounds was also investigated. Both Ni(II) and Co(II) were assayed in the sample of sewer water with satisfactory recovery.