碳纤维束汞膜电极二次微分阳极溶出伏安法测定锌中微量铅

Determination of Trace Lead by Second-order Differential Anodic Stripping Voltammetry With Mercury Film Carbon Fibers Electrode

本文提出了碳纤维束汞膜电极二次微分阳极溶出伏安法测定锌中微量铅的方法,对溶解氧、扫描速度、电极清洗时间、富集电位和时间及酸度的影响作了讨论。方法的线性范围为1.9～80μg/L;检测下限达到1.9 μg/L;对国家保证参考物质(CRM)锌样(GBW 02703)中铅的测定,相对标准偏差和相对误差分别为2.6％和0.65％,结果令人满意。

The determination of trace lead was described by second-order differential anodic stripping voltammetry with mercury film carbon fibers electrode in zinc sample. The effect of dissolved oxygen, scan rate, clear time, deposition time and pH on the determination of lead was discussed. The linear response was given in 1. 9-80 μg/L. The detection limit was 1.9 μg/L. The relative standard deviation and relative error for the determination of lead in GBW 02703(CRM, SBM, Beijing, China) were 2.6% and 0.65% ,respectively, with satisfactory results.