有CTMAB和TritonX-100存在下和在pH4.5的NaAc-HAc缓冲介质中，Ge(Ⅳ)与酒石酸（Tar）和苯基荧光酮（PF）形成胶束混合配位络合物，在0.82mol／L HCl介质中，络合物至少可稳定6h。测得络合物组成比为Ge(Ⅳ)∶Tar∶PF＝1∶2∶2。其最大吸收波长在505nm处，表观摩尔吸光系数ε＝1.25×10５，Ge(Ⅳ)量在0～0.56mg／L范围符合比尔定律。方法灵敏，选择性较高，用于烟道灰和锌精矿中微量锗的测定，结果满意。
In the HAc-NaAc buffer solution at pH 4.5 and in the presence of CTMAB and TritonX-100, germanium(Ⅳ) reacts with tartaric acid (Tar) and phenylfluorone (PF) to form a micellar mixed ligand complex. In the 0.82 mol/L HCl medium, the complex is stable at least for 6h. The composition ratio of Ge(Ⅳ)∶Tar∶PF has been found to be 1∶2∶2. The apparent molar absorptivity is 1.25×105L.mol-1. cm-1 at 505nm. Beer's law is obeyed in the range of 0-0.56mg/L for germanium (Ⅳ). The method is sensitive, selective and has been applied to determine the trace germanium in flue dust and zinc concentrate with satisfactory results.
参考文献
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