科研之友
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摘要
A novel carbon paste electrode for simultaneous determination of lead and cadmium was fabricated by using the mixture of ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, and paraffin oil as binder. This electrode overcame the huge background current of the carbon paste electrode which completely used ionic liquid as binder, and presented a better signal-to-noise ratio and electrochemical activities compared with the traditional carbon paste electrode which employed the paraffin oil as binder. With the electrochemically deposited bismuth film, the developed electrode exhibited well-defined and separate stripping peaks for cadmium and lead. Several parameters, such as the most suitable paste composition, concentration of bismuth, deposition time, deposition potential and pH value were investigated in detail. Under the optimal conditions, the linear range for both metal ions was from 1 to 90 mu gL(-1), and the detection limit was 0.12 mu gL(-1) for cadmium and 0.25 mu gL(-1) for lead, respectively. The electrode was further applied to determine lead and cadmium in soil extracts, and the obtained results were compared with the standard atomic absorption spectroscopy method.
