新显色剂5-(对羧基苯偶氮)-8-羟基喹啉与U(Ⅵ)的显色反应研究及应用

STUDY AND APPLICATION OF THE CHROMOGENIC REACTION OF U(VI) WITH A NEW CHROMOGENIC REAGENT 5-(p-CARBOXYLPHENYLAZO ) -8-H YDROXYQUINOLINE

研究了新显色剂５－（对羧基苯偶氮）－８－羟基喹啉与Ｕ（Ⅵ）的显色反应条件，在阳离子表面活性剂ＣＴＭＡＢ存在下，ＰＨ４．０－６．０缓冲介质中，形成稳定的红色络合物，最大吸收波长为４７０ｎｍ，ε＝４．３９×１０＾４，，含Ｕ（Ⅵ）量在０－５５μｇ／２５ｍｌ范围内符合比耳定律，结合ＴＢＰ萃淋树脂分离富集，并以ＣｙＤＴＡ、ＫＦ联合掩蔽，方法适用于岩石矿物中痕量铀的测定。

The color reaction of U(Ⅳ) with 5-(4-carboxylphenylazo)-8-hydroxyquinoline(p-CPHQ) was studied. In the presence of CTMAB at pH 4. 0-6. 0,U(Ⅳ) forms a red complex with p-CPHQ. The apparent molar absorptivity is 4. 39×104 at 470nm. Beer' s law is obeyed in the range of 0-55μg/25ml. After separation by TBP extraction resin,the method is applied to the detemination of U in rocks with satisfactory results.