极谱测定微量镉,前人已作过许多工作,其中盐酸—碘化钾—四乙基碘化铵极谱测定微量镉的体系,灵敏度比氨性底液的方法提高了很多,选择性也好,但在 2微克以下线性关系不好,且铟等的干扰较大。我们在此基础上作了改进,采用四丁基溴化铵—碘化钾—盐酸体系测定微量镉,灵敏度又有提高,在25毫升体积中,0.2～6微 Polarographic determination of trace cadmium, the predecessor has done a lot of work, including hydrochloric acid - potassium iodide - tetraethylammonium iodide polarographic determination of trace cadmium system, the sensitivity of the method than the ammoniacal solution has improved a lot, the selectivity is good, However, the linear relationship below 2 micrograms is not good, and the interference of indium and the like is larger. We made improvements on this basis, the use of tetrabutyl ammonium bromide - potassium iodide - hydrochloric acid system for the determination of trace cadmium, the sensitivity has increased in the 25 ml volume, 0.2 ~ 6 micro