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Potentiometric stripping analysis at bismuth-film electrode

机译：铋膜电极上的电位剥离分析

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摘要

A bismuth-film electrode (BiFE) operated in the constant-current potentiometric stripping mode exhibits an attractive performance for trace heavy metal detection. The BiFEs are prepared in situ on a glassy-carbon supporting electrode from the 0.1 M acetate buffer solution (pH 4.5) containing 500 mug/L of bismuth(Ill) together with target heavy metal ions. The constant-current potentiometric stripping mode of such electrodes yields well-defined undistorted, reproducible and sharp stripping signals (RSD 1.5% for cadmium. 2.5%, for lead) with good resolution for multiple heavy metal measurements (Zn, Cd, Pb). Along with an extremely low baseline, low limit of detection (0.2 and 0.8 mug/L for cadmium and lead, respectively), and short deposition times, these electrodes compare favorably with "toxic" mercury film electrodes. Several key parameters of the constant-current potentiometric stripping mode were examined and optimized, including the stripping current, deposition potential, and deposition time. The constant-current potentiometric stripping mode of BiFE compares favorably to their voltammetric stripping analogues. Additional insights are given into application of BiFEs for constant-current potentiometric stripping analysis. [References: 18]
机译：以恒流电位剥离模式操作的铋膜电极（BiFE）对痕量重金属的检测显示出有吸引力的性能。 BiFE由含有500杯/升的铋（III）和目标重金属离子的0.1 M乙酸盐缓冲溶液（pH 4.5）在玻璃碳支撑电极上原位制备。此类电极的恒流电位剥离模式可产生清晰的未失真，可再现且清晰的剥离信号（镉的RSD为1.5％，铅为2.5％），并且具有多种重金属测量（Zn，Cd，Pb）的高分辨率。这些电极具有极低的基线，较低的检出限（镉和铅的检出限分别为0.2和0.8 mug / L）以及较短的沉积时间，与“有毒”汞膜电极相比具有优势。检查并优化了恒流电位剥离模式的几个关键参数，包括剥离电流，沉积电位和沉积时间。 BiFE的恒流电位剥离模式优于其伏安剥离类似物。 BiFE在恒流电位剥离分析中的应用还提供了其他见解。 [参考：18]

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