Ge(Ⅳ)-DB-o-NPF-CTMAB显色反应及其应用研究  

STUDY OF THE COLOR REACTION OF Ge(Ⅳ) WITH DB oNPF IN THE PRESENCE OF CTMAB AND ITS ANALYTICAL APPLICATION

作　　者：李孔清[1] 黄美新[1] 

机构地区：[1]湘潭工学院资工系,湘潭411201

出　　处：《理化检验（化学分册）》2001年第3期123-124,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在阳离子表面活性剂 CTMAB存在下 ,研究了 DB- o- NPF与 Ge( )的显色反应。试验表明 ,在磷酸介质中 ,Ge( )与 DB- o- NPF形成 1∶ 2稳定的红色配合物。该配合物最大吸收波长为 550 nm,其表观摩尔吸光系数为 1 .0 4× 1 0 5L·mol-1·cm-1。锗量在 0～ 6μg/2 5ml范围内符合比耳定律。试验结果表明 ,Ge( ) - DB- o- NPF- CTMAB体系显色测定 Ge( ) ,很多离子不干扰测定。方法灵敏度高 ,选择性好 ,有色配合物稳定 48h以上。直接用于烟道灰中微量锗的测定 ,结果满意。It is found that in a phosphoric acid medium germanium (Ⅳ) ion reacts with DB o NPF to form a stable red complex with a mole ratio of M∶R=1∶2, in the presence of CTMAB. The absorption maxima of this complex lies at the wavelength of 550nm with an apparent molar absorptivity of 1.04×10 5L·mol -1 ·cm -1 . Beer′s law holds over the range of 0~6μg of Ge(Ⅳ) per 25ml of solution. Most of the common co existing ions do not interfere with the determination. The color of the complex keeps stable for least 48h. The proposed method has been satisfactorily applied to the determination of Ge(Ⅳ) in flue dust. The method is proved to be sensitive and selective.

关 键 词：吸光光度法 锗 4 5-二溴邻硝基苯基荧光酮 显色反应 烟道炎 CTMAB 

分 类 号：O614.431[理学—无机化学] O657.32[理学—化学]