Bismuth film electrode for simultaneous adsorptive stripping analysis of trace cobalt and nickel using constant current chronopotentiometric and voltammetric protocol

• Published in: Electrochemistry communications Vol. 5; no. 9; pp. 765 - 769
• Main Authors: Hutton, Emily A., Hočevar, Samo B., Ogorevc, Božidar, Smyth, Malcolm R.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.09.2003; Amsterdam Elsevier Science; New York, NY
• Subjects: Adsorptive stripping chronopotentiometry; Analytical chemistry; Bismuth electrode; Chemistry; Cobalt; Dimethylglyoxime; Electrochemical methods; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Nickel; Other electrodes; Adsorptive stripping chronopotentiometry; Nickel; Dimethylglyoxime; Cobalt; Bismuth electrode; Trace analysis; Ammonium; Nickel II Compounds; Chemical analysis; Basic solution; Transition metal Compounds; Buffer solution; Stripping voltammetry; Cobalt II Compounds; Thin layer electrode; Simultaneous measurement; Bismuth; Chronopotentiometry
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/S1388-2481(03)00177-2

Bismuth film electrode (BiFE) is presented as a promising alternative to mercury electrodes for the simultaneous determination of trace cobalt and nickel in non-deoxygenated solutions. The preplated BiFE was employed under adsorptive stripping constant current chronopotentiometric and adsorptive stripping voltammetric conditions in the presence of dimethylglyoxime complexing agent. BiFE exhibited well-defined and undistorted signals with favorable overall resolution for cobalt and nickel cations, with the signals for both metal cations being practically independent of each other. The stripping performance of BiFE is characterized by good reproducibility (RSD 1.4% for Co(II), and 4.3% for Ni(II)), low detection limits of 0.08 μg l −1 for Co(II) and 0.26 μg l −1 for Ni(II) employing a deposition time of 60 s, in addition to good linearity. The non-toxic character of bismuth imparts the possibility of tailoring disposable and one-shot electrochemical sensors for decentralized environmental, clinical and industrial monitoring of trace cobalt and nickel.