采用丝网印刷工艺制备新型流场形电极,通过同位镀铋膜,在流动状态下用方波阳极溶出伏安法(SWSV)检测牛乳中微量铅离子,并对测定条件进行了优化。Pb~(2+)的浓度在(0.5~100)μg/L范围内与溶出峰电流呈良好的线性关系,线性方程i_p(μA)=0.1326c(μg/L)+0.2835(R=0.9987),检出限0.2μg/L。与采用常规丝网印刷电极和静止状态的SWSV检测方式相比,该法灵敏度显著提高。将测定结果与原子荧光光谱法相比,两者无显著性差异。 A new type of flow field electrode was prepared by screen printing process. The micro-lead ions in milk were detected by square wave anodic stripping voltammetry (SWSV) in flowing state through the same-site bismuth-plating film. The determination conditions were optimized. The concentration of Pb 2+ showed a good linear relationship with the peak current in the range of (0.5-100) μg / L. The linear equation i_p (μA) = 0.1326c (μg / L) +0.2835 (R = 0.9987) , The detection limit of 0.2μg / L. Compared with the SWSV detection method using conventional screen printing electrodes and quiescent state, the sensitivity of the method is significantly improved. Compared with the results of atomic fluorescence spectrometry, there is no significant difference between them.