摘要
本工作采用恒电流库仑法分析铀氧化物中的铀。方法基于铀在硫-磷混合酸中以Cr(Ⅱ)还原U(Ⅵ)为U(Ⅳ),过量的Cr(Ⅱ)在空气中被氧化,准确加入比铀的化学计量略过量的重铬酸钾,以精密恒电流电生Fe(Ⅱ)库仑滴定过量的Cr(Ⅳ)。方法的精密度优于0.01％。
A method of constant-current coulometric titration for determination of uranium in uranium oxide is described. This method involves preliminary reduction of U (VI) in H2SO4-H3PO4 medium by Cr (II) as a reductant, followed by air oxidation of excess of Cr (II) , addition of solid K2Cr2 O7 in quantity slightly more than that of the required for quantitative oxidation of U (IV) and final titration of excess of K2Cr2O7 with the electrogenerated Fe (II) . The endpoint is -determined amperometrically. The effect of various factors on the sample treatment and reduction-oxidation processes has been examined. The precision of the method as indicated by the standard deviation of an individual observation is less than 0.01% for 1g uranium oxide.
出处
《铀矿冶》
CAS
1990年第3期51-56,共6页
Uranium Mining and Metallurgy
关键词
铀
恒电流
库仑滴定法
八氧化三铀
Uranium oxide Constant-current coulometry Precision determination
