混合胶束增溶分光光度法测定食物中微量锗

Mixed Micella Solubilization -Spectrophotometric Determination of Trace Amounts of Germanium in Food

提出了一种用分光光度法直接测定食物中锗的斩方法．在３．０ｍｏｌ／Ｌ的磷酸介质中，适量的ＣＴＭＡＢ和ＯＰ存在下，锗（Ⅳ）与ＰＦ形成稳定的橙红色配合物，其λ＿ｍａｘ＝５０５ｎｍ，表观摩尔吸光系数为１．６３×１０￣５Ｌ／（ｍｏｌ·ｃｍ）．方法的变异系数小于４．０％，回收挛９６．１％～９９．３％．

A new method used directly to determine germanium in food spectropho-tometrically is proposed in this article. In the 3. 0 mol/L phosphoric acid medium with prop-er-amounts of cetyltrimethylammonium bromide and polythene glycol-octan phenyl ether,Ge(Ⅳ)and phenylfluorone(9-phenyl-2,3,7-trihydroxy-6-fluorone)(PF) form a stable,or-ange-red Ge(Ⅳ)-PF complex with an absorption maximum at 505 nm and a molar absorptivi-tv of 1. 63×10￣5L/(mol,cm). The variation coefficient of the method is less than 4.0%andrecoverv is 96.1%～99.3%.