矿石中微量铋的测定常用硫脲比色法,但灵敏度不高。铋的极谱催化波灵敏度虽很高,但需通过萃取分离以消除干扰。鉴于1.5次微分电分析法灵敏度高,分辨率好,而且用滴汞电极为工作电极重现性较佳,本文探索了以0.1MHCl-10％KCl-0.1％水杨醛肟为底液,铋在滴汞电极上的1.5次微分电分析特性。结果表明,峰形明晰、灵敏、干扰少。可直接用于矿石中微量铋的测定。方法简便,结果满意。 Determination of trace bismuth ore commonly used thiourea colorimetric method, but the sensitivity is not high. Bismuth polarographic catalytic wave sensitivity is high, but need to be separated by extraction to eliminate interference. In view of the high sensitivity, good resolution and good reproducibility of 1.5-point differential electrochemistry for the working electrode with drop mercury electrode, this paper explored the effect of bismuth in 0.1M HCl-10% KCl-0.1% 1.5 Times Differential Electro-analysis on Mercury Electrode. The results show that the shape of the peak is clear, sensitive and less disturbing. It can be used for the determination of trace bismuth in ore. The method is simple and the result is satisfactory.