提出一种测定痕量铋的微分吸附计时电位法。利用悬汞电极作工作电极 ,置富集电位于 0 .10V ,在0 .0 15mol/LHAc 0 0 0 5mol/LNaAc 7.5× 10 -7mol/L芦丁的底液中 ,测定铋 的线性范围为 1.0× 10 -10 ～7 5× 10 -8mol/L ,检出限为 5× 10 -11mol/L。探讨了影响方法灵敏度的主要因素 ,研究了电极过程。利用此法测定了中草药样品中的铋含量 ,结果满意。 A differential adsorption time-potential method for the determination of trace bismuth was proposed. Using hanging mercury electrode as the working electrode, the enrichment potential was set at 0 .10V, and the linear range of bismuth was determined in the bottom solution of rutin at 0. 0 15mol / LHAc 0 0 0 5mol / L Naac 7.5 × 10 -7mol / L 1.0 × 10 -10 ~7 5 × 10 -8 mol / L, the detection limit of 5 × 10 -11mol / L. The main factors influencing the sensitivity of the method were discussed, and the electrode process was studied. The method was used to determine the content of bismuth in Chinese herbal medicine samples with satisfactory results.