A copper bismuth film electrode for adsorptive cathodic stripping analysis of trace nickel using square wave voltammetry

摘要: Abstract Stripping analysis has been widely recognised as a powerful tool for trace metal analysis. Its remarkable sensitivity is attributed to the combination of preconcentration step coupled with pulse measurements that generates an extremely favourable signal-to-background ratio. Mercury-based electrodes have traditionally employed achieving high reproducibility and stripping technique. However, because toxicity mercury, new alternative electrode materials are highly desired, particularly on-site monitoring. Recently, use bismuth thin films, deposited in situ on platinum or glassy carbon substrates, proposed possible mercury: ‘environmentally-friendly’, low widespread pharmaceutical use. In this paper, preparation film by electrodeposition copper substrate their adsorptive performances presented. Bismuth were prepared ex-situ pulsed potential electrodeposition. The analytical these cathodic voltammetry nickel evaluated nondeaerated solutions. Well-defined peaks along background current obtained ammonia buffer square wave voltammetry, using dimethylglyoxime complexing agent. Linear calibration curves Ni2+ concentrations ranging from 1 × 10−8 1 × 10−7 mol L−1 1 × 10−7 1 × 10−6 mol L−1 relative standard deviations 5% (n = 15) at level. methodology was successfully applied monitor content industrial electrolytic baths, ground water tap water. These results open possibility mercury-based