本文是对碘化钾分光光度法连续测定微量锑 ,铋的改进研究。根据试验结果 ,在聚乙烯醇存在下 ,锑、铋的最大吸收波长分别为425nm和465nm ,表明摩尔吸光系数分别是4.08×103L·mol-1·cm -1和1.19×104L·mol-1·cm -1 ,锑、铋的线性范围分别是0～360μg/25mL和0～300μg/25mL。在硫脲和硫氰酸钾共同存在下 ,直接测定铜电解液中微量的锑、铋 ,获得令人满意结果。 This article is an improved study on the continuous determination of trace antimony and bismuth by potassium iodide spectrophotometry. According to the experimental results, the maximum absorption wavelength of antimony and bismuth in the presence of polyvinyl alcohol are 425 nm and 465 nm, respectively, indicating that the molar absorptivities are 4.08 × 103 L · mol -1 · cm -1 and 1.19 × 104 L · mol -1 · The linear ranges of cm -1, Sb and Bi are 0 ~ 360μg / 25mL and 0 ~ 300μg / 25mL, respectively. In the presence of thiourea and potassium thiocyanate, direct determination of trace amounts of antimony and bismuth in the copper electrolyte results in satisfactory results.