二溴羟基苯基萤光酮胶束增溶光度法测定痕量锗的研究及应用

New Chromogenic Reaction System of DBHPF with Germanium in the Presence of Tween-60

系统地研究了二溴羟基苯基萤光酮在不同表面活性剂存在下与Ｇｅ的显色反应。在０．２－２．０ｍｏｌ／Ｌ的Ｈ２ＳＯ４介质中，显色反应灵敏度高（ε５１８＝１．４１×１０＾５）、显色速度快且至少稳定２４ｈ，干扰少，Ｇｅ量在０－５００ｎｇ／ｍｌ范围内符合比耳定律，经应用于矿石中痕量Ｇｅ的直接测定，证明方法可行。

The conditions for the complex formation of Ge with 2, 3, 7- trihydroxy-9-dibromo-hydroxyphenylfluorone (DBHPF) in the presence of a nonionic surfactant(Tween-60) is studied. The absorbance of the complex is measured at 518 nm against a reagent blank with the molar absorptivity of .1. 42 × 105 L · mol-1· cm-1. The molar ratio of Ge to DBHPF is established as 1 : 4. Beer's law is obeyed in the concentration range 0 to 500ng/ml Ge. The method has been applied to the determination of trace Ge in some minerals without separation. This method is accurate and rapid and the selectivity is satisfactory.