2,6-二氯-4-溴偶氮胂光度法测定微量铀(Ⅵ)

Spectrophotometric Determination of Trace Amounts of Uranium (VI) With 2,6-Dichloro-4-bromo-arsenazo

本文报道用了2,6-二氯-4-溴偶氮胂作显色剂测定微量铀(Ⅵ)的光度法。在H_2SO_4介质中,铀(Ⅵ与)2,6-二氯-4-溴偶氮肿形成1:2络合物,其λ_(max)=640nm;表观摩尔吸光系数为1.1×10~5L·mol^(-1)·cm^(-1),铀的浓度在0.0～22.0μg/ml内符合比耳定律。方法具有灵敏度高、选择性好、操作方便等特点并已用于废水及矿样中微量铀(Ⅵ)的测定。

A spectrophotometric method for the determination of trace amounts of uranium (Ⅵ) with 2, 6-dichloro-4-bromo-arsenazo (CBA) has been reported. Uranium (Ⅵ ) reacts with CBA to form a 1 : 2 stable complex in H_2SO_2 medium. The apparent molar absorptivity of the complex is 1.1× 10~5 L ·mol^(-1) ·cm^(-1) at 640 nm, Beer' s law is obeyed in the range of 0. 0-22. 0 μg/25 ml for uranium. The method is sensitive, selective and simple, and can be applied to the determination of uranium in waste water and ores with satisfactory results.