铀矿石浸出液中游离酸的测定是铀水冶工艺过程中最重要的控制分析项目。虽然目前已有EDTA-Ca法、草酸钾-氯化镁法和六偏磷酸钠法,但对于低酸度及复杂的样品,上述三种方法尚不够准确,原因是络合剂的络合能力并不理想,或者络合剂与样品接触以后有生成离解度小的弱酸(乙二胺四乙酸和草酸)倾向。为此,我们研究了扩阳离子交换树脂使样品中的可水 Determination of free acid in uranium ore leachate is the most important control analysis project in uranium hydrometallurgy process. Although EDTA-Ca method, potassium oxalate-magnesium chloride method and sodium hexametaphosphate method are currently available, the above three methods are not accurate enough for low acidity and complex samples because the complexing ability of the complexing agent is not satisfactory , Or the complexing agent tends to generate weak acids (ethylenediaminetetraacetic acid and oxalic acid) with little dissociation after being brought into contact with the sample. To this end, we studied the cation exchange resin to make the sample water