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本文研究了用差示示波极谱技术测量UO_2~2+对NO_3-的催化还原波以测定废水中痕量铀的方法。在简易的小型交换柱上采用高选择性的TBP萃淋树脂富集铀并使铀与其共存杂质离子分离。经过试验,选择了适宜的测定底液和分离条件。铀的催化波峰电位为-1.15伏(相对于饱和甘汞电极)。本法灵敏度高,步骤简易,无需除氧以及不需特殊试剂。铀的测定下限为10ppb,测定范围0.010～0.20微克铀/毫升,方法相对标准偏差优于±10％,回收率为93～110％。
In this paper, the differential oscillopolarographic technique was used to measure the catalytic reduction of NO_3- by UO_2 ~ 2 + to determine the trace uranium in wastewater. Highly selective TBP extraction resin is used to enrich uranium in a simple miniaturized column and to separate uranium from its co-existing impurity ions. After testing, select the appropriate determination of the bottom liquid and separation conditions. The catalytic peak potential of uranium is -1.15 volts (vs. saturated calomel electrode). The method of high sensitivity, easy steps, without oxygen and without special reagents. The lower limit of determination of uranium is 10ppb, the determination range is 0.010-0.20 microgram uranium / ml, the relative standard deviation of the method is better than ± 10% and the recovery rate is 93-110%.