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

摘要

Macroporous 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.