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 squre wave stripping voltammetry

中文关键词:  电化学  同位镀铋  溶出伏安法  铅  蜂蜜

英文关键词:electrochemistry  in-situ plating bismuth film  stripping voltammetry  lead  honey

中文摘要:

      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。

英文摘要:

      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.