铀-对氟偶氮氯膦显色反应萃取光度法的研究及应用  

Colour reaction of uranium with p fluoro chlorophosphonazo and its application in extraction spectrophotometry

作　　者：袁丁[1] 谢献谋[1] 何治柯[1] 罗庆尧[1] 曾云鹗[1] 

机构地区：[1]武汉大学化学系

出　　处：《化学试剂》1998年第5期257-258,261,共3页Chemical Reagents

摘　　要：较系统地研究了７种不对称变色酸双偶氮氯膦类试剂与铀（Ⅵ）的显色反应，发现其中对氟偶氮氯膦为分光光度法测定铀的较好试剂。在ｐＨ２．５条件下，配合物最大吸收波长为６５５ｎｍ，摩尔吸光系数ε＝４．５８×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。铀（Ⅵ）浓度在０．０～６０μｇ／２５ｍＬ符合比尔定律，相关系数ｒ＝０．９９９４。用磷酸三丁酯－苯萃取分离铀后，将该方法用于测定矿石中铀，结果满意。In this paper,colour reactions of seven unsymmetrical bisazo reagents of chromotropic acid with uranium were investigated.It has been found that p fluoro chlorophosphonazo is highly sensitive and selective.The apparent molar absorptivity is 4 58×10 4L·mol -1 ·cm -1 .Beer′s law is obeyed in the concentration range of 0～60μg/25 mL( r =0 9994, n =9).The method has been applied to determine U(Ⅵ) in ores with satisfactory results after extraction separation.

关 键 词：铀 对氟偶氮氯膦 萃取光度法 显色反应 

分 类 号：O614.62[理学—无机化学]