DMPAQ分光光度法测定岩石中微量铀  

SPECTROPHOTOMETRIC DETERMINATION OF MICROAMOUNTS OF URANIUM IN ROCKS WITH DMPAQ

作　　者：应敏[1] 陈贻文[1] 张晓敏[2] 周瑜芬[2] 黄小武[2] 

机构地区：[1]湖南大学化学化工系 [2]华东地质学院应用化学系

出　　处：《核化学与放射化学》1997年第1期59-64,共6页Journal of Nuclear and Radiochemistry

摘　　要：研究了新试剂５－（４－二甲氨基苯偶氮）－８－羟基喹啉（ＤＭＰＡＱ）与铀（Ⅵ）的显色反应。在非离子型表面活性剂ＴｒｉｔｏｎＸ－１００存在和ｐＨ７．０—９．０缓冲介质中，铀（Ⅵ）与ＤＭＰＡＱ形成稳定的１∶２配合物，最大吸收波长为５１５ｎｍ，摩尔吸收系数κ＝５．６×１０３ｍ２／ｍｏｌ，铀的含量在０—２．０μｇ／ｍＬ范围内符合比耳定律。在适量的ＣｙＤＴＡ存在下，大多数常用离子不干扰测定。经ＴＢＰ萃取色层分离后，本法用于岩石中微量铀的测定。The color reaction of uranium(Ⅵ) with a newly synthesised reagent,5 (4 dimethyl aminophenylazo) 8 hydroxyquinoline(DMPAQ),has been investigated.In a medium of Triton X 100 and pH7 0～9 0 buffer solution,U(Ⅵ)reacts with DMPAQ to form a stable complex with a molar ratio of 1∶2.The complex exhibits a maximum absorption at 515 nm with an apparent molar absorptivity of 5 6×10 3 m 2/mol.Beer′s law is obeyed in the range of 0—2 0 μg/mL of U(Ⅵ).In the presence of CyDTA,most common ions do not interfere with the determination of U.The proposed method is applied to the determination of microamounts of uranium in rocks after the separation by TBP chromotography.The results are satisfactory.

关 键 词：铀 二甲氨基苯偶氮 羟基喹啉 分光光度法 岩石 

分 类 号：O614.62[理学—无机化学] P585.3[理学—化学]