同位镀铋方波溶出伏安法检测蜂蜜中的痕量铅

Determination of trace lead in honey with in-situ bismuth film electrode by square wave stripping voltammetry

目的 采用同位镀铋方波溶出伏安法检测蜂蜜中的痕量铅.方法 采用铋膜电极替代传统的汞膜电极,并结合方波溶出伏安法和电极同位镀铋膜法,实现对蜂蜜中痕量铅的快速检测.结果 优化了底液,pH,铋浓度,沉积电位和沉积时间五项最佳实验条件参数.铅在铋膜电极上可得到灵敏的溶出峰,其溶出电位为-0.580 V.在优化的实验条件下,该方法检测铅的线性范围为5～100 μg/L(r=0.9965),检测限低达0.630 μg/L.实验结果与石墨炉原子吸收法结果相比无显著性差异.结论 该研究为蜂蜜等食品中铅的快速、高灵敏检测提供了新的手段.

Objective To determine the trace lead in honey with in-situ bismuth film electrode by square wave stripping voltammetry.Methods Using glassycarbon electrode in-situ plated in bismuth(III),replacing in traditional mercury(II),the trace lead in honey was rapidly detected by square wave stripping voltammetry method.Results Several factors were optimized,including buffer solutions,pH,the concentration of Bi3+,plating potential and plating time.Sensitive stripping peak of lead was obtained at the potential of-0.580 V in the bismuth film electrode.Under the optimized analytical condition,the stripping peak currents were changed linearly with the concentration of Pb2+ over range from 5 ~100 μg/L(r=0.9965) with a detection limit of 0.630 μg/L.The result was in accordance with that of graphite furnace atomic absorption spectrometry(GFAAS).Conclusion The established method is rapid and accurate in detecting trace lead in honey.