Nafion修饰汞膜电极微分脉冲阳极溶出伏安法测定蔬菜中的铅

摘要

采用Nafion修饰汞膜电极微分脉冲阳极溶出伏安法测定蔬菜中的铅,选择0.1 mol/L NH4NO3作为支持电解质,富集时间420 s,搅拌速度300 r/min,Nafion修饰体积10 μL,考察了共存离子的干扰.方法在0.01 μg/L～ 14.0 μg/L范围内线性良好,检出限为0.2 μg/L,铅酸电池厂附近蔬菜样品的测定结果与石墨炉原子吸收光谱法相吻合,加标回收率为89.5％～106％.%A new method based on Nafion modified mercury film electrode has been established for detection of Pb2 + in vegetables from the vicinity of lead-acid battery factory by differential pulse stripping voltammetry. The parameters of this method is 0. 1 mol/L NH4NO3 as supporting electrolyte, accumulation time of 420 s, stirring rate of 300 r/min, the Nafion modified volume of 10μL and interfering ions were investigated. It showed good linear relationship between peak current and Pb2+ in the range of 0.01μg/L to 14.0μg/L. The detection limit was 0.2 μg/L. The vegetable sample measurement results using this method have good consistency with GFAAS, and the spiked recoveries ranged from 89.5% to 106%.