二溴邻硝基苯基萤光酮光度法测定煤矸石中微量锗  

The Spectrophotometric Determination of Micro amounts of Germanium in Coal Gangue

作　　者：林发[1] 刘继进[1] 

机构地区：[1]湘潭工学院化工系,湖南湘潭411201

出　　处：《岩矿测试》2000年第2期158-160,共3页Rock and Mineral Analysis

摘　　要：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 the presence of Tween 20 and in the medium of phosphoric acid, germanium (Ⅳ) reacts with 4,5 dibromo 2 nitro phenylfluorone(DB o N PF) to form a red complex with stability of over 24 h The maximum absorption is at 540 nm with apparent molar absorptivity of 1 02×10 5 L·mol -1 ·cm -1 The composition of the complex is n Ge(Ⅳ) ∶ n DB o N PF =1∶2 Beer′s law is obeyed in the concentration range of 0～240 μg/L for Ge(Ⅳ) The recovery of standard addition is 98 5%～101 5% with precision of ≤2 5% RSD( n =6) The proposed method has been applied to determination of micro amounts of germanium in coal gangues with satisfactory results

关 键 词：煤矸石 锗 二溴邻硝基萤光酮 光度法 

分 类 号：TQ533.1[化学工程—煤化学工程] O614.431[理学—无机化学]