研究了BDPTK[4,4’-二乙氨基)-二苯硫酮]与铑的显色反应。在乙酸-乙酸钠缓冲介质中,当抗坏血酸和 TritonX-100存在下,沸水浴加热10分钟,显色反应可迅速完成,摩尔吸光系数为8.8×10~4 1·mol~(-1)·cm~(-1)铑含量在0—35μg/26ml 范围内符合比耳定律。研究了共存离子的干扰情况并确定锗的稀溶液(20μg/ml)在室温下放置1—20天,其反应性能无明显变化;应用于萃取残液中铑的测定,其结果与 ICP 法基本一致. The color reaction of BDPTK [4,4’-diethylamino) -diphenylthione] with rhodium was studied. In acetic acid - sodium acetate buffer medium, the chromogenic reaction can be rapidly completed by heating in boiling water bath for 10 minutes in the presence of ascorbic acid and TritonX-100 with a molar extinction coefficient of 8.8 × 10 -4 -1 · mol -1 ~ (-1) rhodium content in the range of 0-35μg / 26ml Beer’s law. The interference of coexisting ions was studied and the dilute solution of germanium (20μg / ml) was determined at room temperature for 1-20 days. The reaction performance did not change obviously. The determination of rhodium in extraction raffinate was consistent with that of ICP method Consistent.