在H3PO4介质中 ,Tween 2 0存在下 ,Ge(Ⅳ )与二溴邻硝基苯基萤光酮 (DBoN -PF)反应生成红色配合物。该配合物的最大吸收波长为 540nm ,表观摩尔吸光系数为 1 0 2× 1 0 5 L·mol- 1 ·cm- 1 ,稳定时间至少 2 4h。测得配合物的组成比为nGe(Ⅳ ) ∶nDBoN PF=1∶2 ,锗的质量浓度在0～ 2 4 0 μg/L遵守比尔定律。应用于煤矸石中微量锗的测定 ,结果与常用的苯芴酮法相符 ,6次测定的RSD≤ 2 5% ,加标回收率在 98 5%～ 1 0 1 5%。 In H3PO4 medium, Ge (Ⅳ) reacts with dibromo-o-nitrophenylfluorone (DBoN-PF) in the presence of Tween 2 O to form a red complex. The maximum absorption wavelength of the complex is 540nm, the apparent molar absorptivity is 102 × 105 L · mol-1 · cm-1, and the stability time is at least 24 h. The composition ratio of the complex was nGe (IV): nDBoN PF = 1: 2, and the mass concentration of germanium was 0-240 μg / L. The method was applied to the determination of trace germanium in coal gangue. The results were in good agreement with the commonly used phenyl fluorenone method. RSD≤25% of the six determinations and the recoveries of spiked samples ranged from 98.5% to 105%.