Wei sheng yan jiu = Journal of hygiene research · 2014
[Antimony film-plated glassy carbon electrode for simultaneous determination of trace lead and cadmium in urine by differential pulse stripping voltammetry in the presence of cetyltrimethylammonium bromide].
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Gong Weilei, Wang Changqin, Yang Jinling, Zhang Kai
Аннотация
OBJECTIVE: To investigate and optimize the experiment conditions of determining lead and cadmium simultaneously with antimony film-plated glassy carbon electrode.
METHODS: CTAB was used as sensitizer, and antimony film-plated glassy carbon electrode was prepared by in-situ plating for the determination of trace lead and cadmium by differential pulse stripping voltammetry.
RESULTS: Under optimized conditions, well defined peaks of lead and cadmium were obtained at the potential of -0.48 V and -0.73 V respectively. Following a 180 s preconcentration, the stripping peak currents changed linearly with the concentration of lead and cadmium over the range from 0 to 100 μg/L (r ≥ 0.991). The detection limits of lead and cadmium were 0.47 μg/L and 0.78 μg/L. The average recoveries were 92.0% - 104.3% and 94.0% - 102.6% respectively, with the relative standard deviations no more than 6.1%. The method was applied to the determination of lead in urine, and the results were satisfactory.
CONCLUSION: The method has high sensitivity, good precision and accuracy. Antimony film electrode could be used for another new environment-friendly membrance electrode for determination of lead in human urine samples instead of mercury film electrode.
METHODS: CTAB was used as sensitizer, and antimony film-plated glassy carbon electrode was prepared by in-situ plating for the determination of trace lead and cadmium by differential pulse stripping voltammetry.
RESULTS: Under optimized conditions, well defined peaks of lead and cadmium were obtained at the potential of -0.48 V and -0.73 V respectively. Following a 180 s preconcentration, the stripping peak currents changed linearly with the concentration of lead and cadmium over the range from 0 to 100 μg/L (r ≥ 0.991). The detection limits of lead and cadmium were 0.47 μg/L and 0.78 μg/L. The average recoveries were 92.0% - 104.3% and 94.0% - 102.6% respectively, with the relative standard deviations no more than 6.1%. The method was applied to the determination of lead in urine, and the results were satisfactory.
CONCLUSION: The method has high sensitivity, good precision and accuracy. Antimony film electrode could be used for another new environment-friendly membrance electrode for determination of lead in human urine samples instead of mercury film electrode.